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--> 218 <!-- </header> --> 219 220 <div id="primary" class="content-area"> 221 <main id="main" class="site-main" role="main"> 222 223 224<article id="post-6229" class="post-6229 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized"> 225 <header class="entry-header"> 226 <p class="news_title_wrapper"><span class="h2 news_title"><a href="https://castle-engine.io/wp/2026/09/05/everyone-book-a-meeting-with-me-to-talk-about-castle-game-engine/" rel="bookmark">Everyone! Book a meeting with me to talk about Castle Game Engine</a></span></p><p class="news_date_wrapper"><span class="news_date"><span class="screen-reader-text">Posted on</span> <a href="https://castle-engine.io/wp/2026/09/05/everyone-book-a-meeting-with-me-to-talk-about-castle-game-engine/" rel="bookmark"><time class="entry-date published updated" datetime="2026-09-05T18:32:37+00:00">September 5, 2026</time></a></span></p> </header><!-- .entry-header --> 227 228 <div class="entry-content"> 229 <table class="thumbnails thumbnails-align-right"><tr><td> 230 <a href="https://castle-engine.io/wp/wp-content/uploads/2024/08/itdevcon-michalis.jpg" 231 class="screenshot" 232 title="Michalis at ITDevCon 2023"><img decoding="async" 233 style="float: right" 234 src="https://castle-engine.io/wp/wp-content/uploads/2024/08/itdevcon-michalis-200x113.jpg" 235 width="200" height="113" 236 alt="Michalis at ITDevCon 2023" 237 ></a></td></tr></table> 238<p>Hey everyone! Use this <a href="https://calendar.proton.me/bookings#IFp0_KuiKOQDieI7o4imzSQaYVPbmjaG2eL3ihaGop0=">Book a Meeting</a> link to schedule a meeting with me (I’m <em>
238Michalis Kamburelis</em>, <em>Castle Game Engine</em> lead).</p> 239<p>Yes, I mean <em>you</em>. Do it right now. Don’t hesitate. Stop reading now, and click that link!</p> 240<p>You’re still reading? Let me give some examples what we can talk about:</p> 241<ul> 242<li>If you use the engine, and want to show me <em>how</em> you use it (and where do you have <em>questions</em> or <em>feature requests</em>) -> book a meeting.</li> 243<li>If you wonder about making a game (or other application), and you’re not sure how to approach this type of game using our engine (you want some advise, you want to see how I would start it) -> book a meeting.</li> 244<li>If you use the engine and hit a bug, and it’s kind of hard to explain in words/screenshots and it would be easier to <em>show me</em> -> book a meeting.</li> 245<li>If you <em>don’t</em> use the engine, but you wonder about it, or you want to tell me <em>what is blocking you</em> -> book a meeting.</li> 246<li>If you want to support me, maybe even you have a company and want b2b cooperation (I have <a href="https://castle-engine.io/donate">a company too and can provide services around CGE</a>) -> book a meeting.</li> 247</ul> 248<p>I hope I made myself clear: this is really for <em>everyone</em> to talk with me about <em>anything</em>. Well, anything related to <em>Castle Game Engine</em>🙂 Or at least related to <em>Pascal</em> or <em>open-source</em> or general <em>game development</em>. Or at least <em>cats</em>.</p> 249<p>The link to book a meeting is also available in the header of our webpage, right next to the <a href="https://www.patreon.com/c/castleengine">donate (through Patreon)</a> link. I consider both these links critical for the engine success now, I want to talk with you, and I want to learn what you think about the engine. Let’s talk!</p> 250<p><em>Looking at a larger picture:</em></p> 251<p>I came back from <a href="https://castle-engine.io/wp/2026/08/26/particle-system-updates-custom-shaders-web-support-freecad-x3d-exporter-documentation-exe-size-2d-easy-link-to-api-geometry-shader-fixes/">vacations in August</a> with a lot of new energy and passion. Maybe we are not some big commercial game engine, and we don’t have to be! But I have dreams:</p> 252<ul> 253<li>about beautiful games I want to make using this engine,</li> 254<li>and about allowing you to make games using this engine,</li> 255<li>about sustaining the engine open-source development,</li> 256<li>and about thriving as a community where we just <em>enjoy</em> what we do, in a technical and artistic way. I know I ultimately <em>enjoy</em> doing this engine and I enjoy making games, this is my life, and I want to share this happiness and freedom.</li> 257</ul> 258<p>I have some thoughts about realizing this vision, and I have some future posts that I will share with you about it. For starters, I think the most important thing is that I want to meet with you and listen to you. So click <a href="https://calendar.proton.me/bookings#IFp0_KuiKOQDieI7o4imzSQaYVPbmjaG2eL3ihaGop0=">this link and book a meeting</a>! I mean it!</p> 259<p>Of course I also remain open to every feedback and question on our <a href="https://forum.castle-engine.io/">forum</a> and <a href="https://castle-engine.io/talk.php">other channels</a>. If you want to write to me directly, you can too: <code>[email protected]</code>.</p> 260<p>And yes, before you ask: in addition to these “one-on-one” meetings I also think about bringing back our “regular group meetings”. We had them regular for some time, on Discord. I think we should restore the idea, though I wonder about few changes to a formula. That’s also something for a future news post:)</p> 261<div class="sharedaddy sd-sharing-enabled"><div class="robots-nocontent sd-block sd-social sd-social-icon-text sd-sharing"><h3 class="sd-title">Share this:</h3><div class="sd-content"><ul><li class="share-bluesky"><a rel="nofollow noopener noreferrer" 262 data-shared="sharing-bluesky-6229" 263 class="share-bluesky sd-button share-icon" 264 href="https://castle-engine.io/wp/2026/09/05/everyone-book-a-meeting-with-me-to-talk-about-castle-game-engine/?share=bluesky" 265 target="_blank" 266 aria-labelledby="sharing-bluesky-6229" 267 > 268 <span id="sharing-bluesky-6229" hidden>Share on Bluesky (Opens in new window)</span> 269 <span>Bluesky</span> 270 </a></li><li class="share-mastodon"><a rel="nofollow noopener noreferrer" 271 data-shared="sharing-mastodon-6229" 272 class="share-mastodon sd-button share-icon" 273 href="https://castle-engine.io/wp/2026/09/05/everyone-book-a-meeting-with-me-to-talk-about-castle-game-engine/?share=mastodon" 274 target="_blank" 275 aria-labelledby="sharing-mastodon-6229" 276 > 277 <span id="sharing-mastodon-6229" hidden>Share on Mastodon (Opens in new window)</span> 278 <span>Mastodon</span> 279 </a></li><li class="share-facebook"><a rel="nofollow noopener noreferrer" 280 data-shared="sharing-facebook-6229" 281 class="share-facebook sd-button share-icon" 282 href="https://castle-engine.io/wp/2026/09/05/everyone-book-a-meeting-with-me-to-talk-about-castle-game-engine/?share=facebook" 283 target="_blank" 284 aria-labelledby="sharing-facebook-6229" 285 > 286 <span id="sharing-facebook-6229" hidden>Share on Facebook (Opens in new window)</span> 287 <span>Facebook</span> 288 </a></li><li class="share-threads"><a rel="nofollow noopener noreferrer" 289 data-shared="sharing-threads-6229" 290 class="share-threads sd-button share-icon" 291 href="https://castle-engine.io/wp/2026/09/05/everyone-book-a-meeting-with-me-to-talk-about-castle-game-engine/?share=threads" 292 target="_blank" 293 aria-labelledby="sharing-threads-6229" 294 > 295 <span id="sharing-threads-6229" hidden>Share on Threads (Opens in new window)</span> 296 <span>Threads</span> 297 </a></li><li class="share-linkedin"><a rel="nofollow noopener noreferrer" 298 data-shared="sharing-linkedin-6229" 299 class="share-linkedin sd-button share-icon" 300 href="https://castle-engine.io/wp/2026/09/05/everyone-book-a-meeting-with-me-to-talk-about-castle-game-engine/?share=linkedin" 301 target="_blank" 302 aria-labelledby="sharing-linkedin-6229" 303 > 304 <span id="sharing-linkedin-6229" hidden>Share on LinkedIn (Opens in new window)</span> 305 <span>LinkedIn</span> 306 </a></li><li class="share-reddit"><a rel="nofollow noopener noreferrer" 307 data-shared="sharing-reddit-6229" 308 class="share-reddit sd-button share-icon" 309 href="https://castle-engine.io/wp/2026/09/05/everyone-book-a-meeting-with-me-to-talk-about-castle-game-engine/?share=reddit" 310 target="_blank" 311 aria-labelledby="sharing-reddit-6229" 312 > 313 <span id="sharing-reddit-6229" hidden>Share on Reddit (Opens in new window)</span> 314 <span>Reddit</span> 315 </a></li><li class="share-email"><a rel="nofollow noopener noreferrer" 316 data-shared="sharing-email-6229" 317 class="share-email sd-button share-icon" 318 href="mailto:?subject=%5BShared%20Post%5D%20Everyone%21%20Book%20a%20meeting%20with%20me%20to%20talk%20about%20Castle%2
3180Game%20Engine&body=https%3A%2F%2Fcastle-engine.io%2Fwp%2F2026%2F09%2F05%2Feveryone-book-a-meeting-with-me-to-talk-about-castle-game-engine%2F&share=email" 319 target="_blank" 320 aria-labelledby="sharing-email-6229" 321 data-email-share-error-title="Do you have email set up?" data-email-share-error-text="If you're having problems sharing via email, you might not have email set up for your browser. You may need to create a new email yourself." data-email-share-nonce="d1c617cdba" data-email-share-track-url="https://castle-engine.io/wp/2026/09/05/everyone-book-a-meeting-with-me-to-talk-about-castle-game-engine/?share=email"> 322 <span id="sharing-email-6229" hidden>Email a link to a friend (Opens in new window)</span> 323 <span>Email</span> 324 </a></li><li class="share-end"></li></ul></div></div></div> </div><!-- .entry-content --> 325 326 327 <a href="https://forum.castle-engine.io/t/everyone-book-a-meeting-with-me-to-talk-about-castle-game-engine/2205#comments">Comments on the forum ➤</a> 328</article><!-- #post-## --> 329 330<article id="post-6208" class="post-6208 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized tag-castleengine tag-gamedev tag-pascal tag-shaders tag-x3d"> 331 <header class="entry-header"> 332 <p class="news_title_wrapper"><span class="h2 news_title"><a href="https://castle-engine.io/wp/2026/08/26/particle-system-updates-custom-shaders-web-support-freecad-x3d-exporter-documentation-exe-size-2d-easy-link-to-api-geometry-shader-fixes/" rel="bookmark">Particle system updates (custom shaders, web support), FreeCAD -> X3D exporter, documentation (exe size, 2D, easy link to API), geometry shader fixes</a></span></p><p class="news_date_wrapper"><span class="news_date"><span class="screen-reader-text">Posted on</span> <a href="https://castle-engine.io/wp/2026/08/26/particle-system-updates-custom-shaders-web-support-freecad-x3d-exporter-documentation-exe-size-2d-easy-link-to-api-geometry-shader-fixes/" rel="bookmark"><time class="entry-date published updated" datetime="2026-08-26T02:51:24+00:00">August 26, 2026</time></a></span></p> </header><!-- .entry-header --> 333 334 <div class="entry-content"> 335 <table class="thumbnails thumbnails-align-right"><tr><td> 336 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/08/particles.jpg" 337 class="screenshot" 338 title="Particle system"><img decoding="async" 339 style="float: right" 340 src="https://castle-engine.io/wp/wp-content/uploads/2026/08/particles-200x116.jpg" 341 width="200" height="116" 342 alt="Particle system" 343 ></a></td></tr><tr><td> 344 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/08/La_Cruz_Version_21_0.jpg" 345 class="screenshot" 346 title="FreeCAD -&gt; X3D, in Castle Model Viewer"><img decoding="async" 347 style="float: right" 348 src="https://castle-engine.io/wp/wp-content/uploads/2026/08/La_Cruz_Version_21_0-200x103.jpg" 349 width="200" height="103" 350 alt="FreeCAD -&gt; X3D, in Castle Model Viewer" 351 ></a></td></tr><tr><td> 352 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/08/news_geometry_shader_fun_smoothing_0.png" 353 class="screenshot" 354 title="Geometry shaders example"><img loading="lazy" decoding="async" 355 style="float: right" 356 src="https://castle-engine.io/wp/wp-content/uploads/2026/08/news_geometry_shader_fun_smoothing_0-200x113.png" 357 width="200" height="113" 358 alt="Geometry shaders example" 359 ></a></td></tr><tr><td> 360 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/08/michalis.jpg" 361 class="screenshot" 362 title="Michalis:)"><img loading="lazy" decoding="async" 363 style="float: right" 364 src="https://castle-engine.io/wp/wp-content/uploads/2026/08/michalis-200x183.jpg" 365 width="200" height="183" 366 alt="Michalis:)" 367 ></a></td></tr></table> 368<p>Forgive us for a calm August without the usual weekly announcements, as Michalis spent most of the month on a family vacation. Stay tuned for an upcoming news post about a feature he made when his wife wasn’t watching: <em>Android and iOS compatibility with Delphi</em> 🙂</p> 369<p>Until then, here are a number of announcements you can enjoy right now — with big thanks to everyone using the engine and building the ecosystem around it:</p> 370<ol> 371<li><em>Kagamma (Trung Le)</em> has updated his <a href="https://github.com/Kagamma/cge-3d-particle-emitter">GPU-based particle system for Castle Game Engine</a>. New features, announced on the <a href="https://forum.castle-engine.io/t/3d-particle-system-now-with-full-support-for-2d-and-castle-editor/406/12?u=michalis">forum thread</a>, are: 372<ul> 373<li>Custom shaders: Influence particle position and look using a PLUG system similar to our <a href="https://castle-engine.io/shaders">shader effects</a>. See <a href="https://github.com/Kagamma/cge-3d-particle-emitter/blob/master/EffectReference.md#custom-shaders">docs</a>.</li> 374<li><a href="https://castle-engine.io/web">Web target</a> support: see <a href="https://kagamma.github.io/cge-3d-particle-demo/">demo online</a>.</li> 375<li>Modify the built-in particle mesh in editor.</li> 376<li>Rotation type support.</li> 377</ul> 378</li> 379<li><em>Kagamma (Trung Le)</em> also updated his alternative approach for particles in our engine: <a href="https://forum.castle-engine.io/t/effekseer-1-80-5/2181">particles designed in Effekseer version 1.80.5 are now supported</a>. Download the updated shared libraries for <em>Windows, Linux and Android</em> from <a href="https://github.com/Kagamma/cge-effekseer/releases">here</a>.</p> 380</li> 381<li> 382<p><em>Marco Mora</em>
382 posted about a new exporter from <a href="https://www.freecad.org/">FreeCAD</a> to <a href="https://castle-engine.io/x3d">X3D with Castle Game Engine extensions</a>. See his <a href="https://forum.castle-engine.io/t/gameengineexportwb-freecad-to-x3d-and-castle-model-viewer/2197">forum post for a description and screenshots</a> and the <a href="https://github.com/MVM444/GameEngineExportWB">repository here</a>. You can see pretty mirrors on the screenshot, using our <a href="https://castle-engine.io/mirror_plane">X3D extension for mirrors on flat objects</a>. Enjoy and post your feedback in the forum!</p> 383</li> 384<li> 385<p>We have <a href="https://github.com/castle-engine/castle-engine/blob/master/doc/miscellaneous_notes/executable_size.md">documented how to optimize executable size (for all platforms)</a> and committed a fix (no need for <code>exports</code>) that makes the generated Linux executables much smaller (~45%) out-of-the-box.</p> 386</li> 387<li> 388<p>We reworked the <a href="https://castle-engine.io/viewport_2d">creating 2D games</a> page of our manual. This was waiting too long for a “big 2D tutorial” — which may still come some day, but in the meantime, the existing page is hopefully sufficient: it presents a short 2D overview and refers to other pages (since a lot of engine concepts are just the same for 2D and 3D usage).</p> 389</li> 390<li> 391<p>As a small feature on our website, you can now use URLs like this:</p> 392<p><code>https://castle-engine.io/api?id=PASCAL-IDENTIFIER</code></p> 393<p>… and it will automatically redirect to the proper API docs of a given identifier. For example, use</p> 394<p><a href="https://castle-engine.io/api?id=TCastleWindow">https://castle-engine.io/api?id=TCastleWindow</a></p> 395<p>to redirect to</p> 396<p><a href="https://castle-engine.io/apidoc/html/CastleWindow.TCastleWindow.html">https://castle-engine.io/apidoc/html/CastleWindow.TCastleWindow.html</a></p> 397<p>This is nice when writing URLs from outside of our website, e.g. from Markdown files in our source code. Of course, you can also just “spell out” the full URL like https://castle-engine.io/apidoc/html/CastleWindow.TCastleWindow.html there, but using the shorter https://castle-engine.io/api?id=TCastleWindow is</p> 398<ul> 399<li>A bit easier. You don’t need to think about which unit <code>TCastleWindow</code> is in. This is resolved when we handle the redirect.</p> 400</li> 401<li> 402<p>More future-proof. If we ever move the identifier <code>TCastleWindow</code> from one unit to another, the simple URL https://castle-engine.io/api?id=TCastleWindow will continue to work.</p> 403</li> 404</ul> 405<p>Note: if you update documentation on our website, this is not necessary! In AsciiDoctor files, just use <code>cgeref:TCastleWindow[]</code> and it will display a proper link to <code>TCastleWindow</code>, showing a warning (in development mode) if <code>TCastleWindow</code> is not found. See <a href="https://github.com/castle-engine/cge-www">cge-www README about developing our website</a>.</p> 406</li> 407<li> 408<p><a href="https://castle-engine.io/compositing_shaders_doc/html/chapter.geometry_shaders.html">Geometry shaders</a> received a number of fixes under the hood. Everything works again, and the code is cleaner than ever 🙂</p> 409<ul> 410<li>See <a href="https://castle-engine.io/compositing_shaders_doc/html/chapter.geometry_shaders.html">how to use geometry shaders with shader effects</a>. Examples are <a href="https://github.com/castle-engine/demo-models/tree/master/compositing_shaders">here</a>.</p> 411</li> 412<li> 413<p>See <a href="https://castle-engine.io/x3d_implementation_shaders.php#section_geometry">how to use geometry shaders with ComposedShader</a>. Examples are <a href="https://github.com/castle-engine/demo-models/tree/master/shaders">here</a>.</p> 414</li> 415<li>Under the hood we have introduced <a href="https://github.com/castle-engine/castle-engine/tree/master/src/scene/glsl#varying-passthrough-geometry-shaders">magic <code>/* VARYING-PASSTHROUGH-GEOMETRY-SHADERS */</code> comment</a> to make it easier to pass data through geometry shader effects.</li> 416</ul> 417</li> 418<li> 419<p>Important fix for XML reading with <em>Delphi</em> — this was crashing our <a href="https://github.com/castle-engine/castle-engine/tree/master/examples/3d_games/explore_impressive_castle">explore_impressive_castle</a> demo.</p> 420</li> 421<li> 422<p>Fixed applying transformations if you modify <code><a href="https://castle-engine.io/apidoc/html/CastleTransform.TCastleTransform.html#Exists">TCastleTransform.Exists</a></code> often. Previously, setting <code>Exists</code> to <code>true</code> during rendering but flipping it to <code>false</code> during updating was causing a surprising effect: we rendered old transformations. Now the rendering always shows the current transformation.</p> 423</li> 424<li> 425<p>Trying to open a 2nd <code><a href="https://castle-engine.io/apidoc/html/CastleWindow.TCastleWindow.html">TCastleWindow</a></code> on the <em>web</em>, <a href="https://castle-engine.io/android">Android</a> or other platforms that don’t support it will now result in a clear exception, with a message instructing you to check “<code>Application.MultipleWindowsPossible</code>“. This makes the situation cleaner than the previous <em>“opening 2nd window works by accident, overriding the previous window rendering”</em>. Demo is inside <a href="https://github.com/castle-engine/castle-engine/tree/master/examples/window/multiple_windows_and_viewports">multiple_windows_and_viewports</a>.</p> 426</li> 427</ol> 428<p>Enjoying the engine? Please <a href="https://www.patreon.com/c/castleengine">support us on Patreon</a>!</p> 429<div class="sharedaddy sd-sharing-enabled"><div class="robots-nocontent sd-block sd-social sd-social-icon-text sd-sharing"><h3 class="sd-title">Share this:</h3><div class="sd-content"><ul><li class="share-bluesky"><a rel="nofollow noopener noreferrer" 430 data-shared="sharing-bluesky-6208" 431 class="share-bluesky sd-button share-icon" 432 href="https://castle-engine.io/wp/2026/08/26/particle-system-updates-custom-shaders-web-support-freecad-x3d-exporter-documentation-exe-size-2d-easy-link-to-api-geometry-shader-fixes/?share=bluesky" 433 target="_blank" 434 aria-labelledby="sharing-bluesky-6208" 435 > 436 <span id="sharing-bluesky-6208" hidden>Share on Bluesky (Opens in new window)</span> 437 <span>Bluesky</span> 438 </a></li><li class="share-mastodon"><a rel="nofollow noopener noreferrer" 439 data-shared="sharing-mastodon-6208" 440 class="share-mastodon sd-button share-icon" 441 href="https://castle-engine.io/wp/2026/08/26/particle-system-updates-custom-shaders-web-support-freecad-x3d-exporter-documentation-exe-size-2d-easy-link-to-api-geometry-shader-fixes/?share=mastodon" 442 target="_blank" 443 aria-labelledby="sharing-mastodon-6208" 444 > 445 <span id="sharing-mastodon-6208" hidden>Share on Mastodon (Opens in new window)</span> 446 <span>Mastodon</span> 447 </a></li><li class="share-facebook"><a rel="nofollow noopener noreferrer" 448 data-shared="sharing-facebook-6208" 449 class="share-facebook sd-button share-icon" 450 href="https://castle-engine.io/wp/2026/08/26/particle-system-updates-custom-shaders-web-support-freecad-x3d-exporter-documentation-exe-size-2d-easy-link-to-api-geometry-shader-fixes/?share=facebook" 451 target="_blank" 452 aria-labelledby="sharing-facebook-6208" 453 > 454 <span id="sharing-facebook-6208" hidden>Share on Facebook (Opens in new window)</span> 455 <span>Facebook</span> 456 </a></li><li class="share-threads"><a rel="nofollow noopener noreferrer" 457 data-shared="sharing-threads-6208" 458 class="share-threads sd-button share-icon" 459 href="https://castle-engine.io/wp/2026/08/26/particle-system-updates-custom-shaders-web-support-freecad-x3d-exporter-documentation-exe-size-2d-easy-link-to-api-geometry-shader-fixes/?share=threads" 460 target="_blank" 461 aria-labelledby="sharing-threads-6208" 462 > 463 <span id="sharing-threads-6208" hidden>Share on Threads (Opens in new window)</span> 464 <span>Threads</span> 465 </a></li><li class="share-linkedin"><a rel="nofollow noopener noreferrer" 466 data-shared="sharing-linkedin-6208" 467 class="share-linkedin sd-button share-icon" 468 href="https://castle-engine.io/wp/2026/08/26/particle-system-updates-custom-shaders-web-support-freecad-x3d-exporter-documentation-exe-size-2d-easy-link-to-api-geometry-shader-fixes/?share=linkedin" 469 target="_blank" 470 aria-labelledby="sharing-linkedin-6208" 471 > 472 <span id="sharing-linkedin-6208" hidden>Share on LinkedIn (Opens in new window)</span> 473 <span>LinkedIn</span> 474 </a></li><li class="share-reddit"><a rel="nofollow noopener noreferrer" 475 data-shared="sharing-reddit-6208" 476 class="share-reddit sd-button share-icon" 477 href="https://castle-engine.io/wp/2026/08/26/particle-system-updates-custom-shaders-web-support-freecad-x3d-exporter-documentation-exe-size-2d-easy-link-to-api-geometry-shader-fixes/?share=reddit" 478 target="_blank" 479 aria-labelledby="sharing-reddit-6208" 480 > 481 <span id="sharing-reddit-6208" hidden>Share on Reddit (Opens in new window)</span> 482 <span>Reddit</span> 483 </a></li><li class="share-email"><a rel="nofollow noopener noreferrer" 484 data-shared="sharing-email-6208" 485 class="share-email sd-button share-icon" 486 href="mailto:?subject=%5BShared%20Post%5D%20Particle%20system%20updates%20%28custom%20shaders%2C%20web%20support%29%2C%20FreeCAD%20-%3E%20X3D%20exporter%2C%20documentation%20%28exe%20size%2C%202D%2C%20easy%20link%20to%20API%29%2C%20geometry%20shader%20fixes&body=https%3A%2F%2Fcastle-engine.io%2Fwp%2F2026%2F08%2F26%2Fparticle-system-updates-custom-shaders-web-support-freecad-x3d-exporter-documentation-exe-size-2d-easy-link-to-api-geometry-shader-fixes%2F&share=email" 487 target="_blank" 488 aria-labelledby="sharing-email-6208"
489 data-email-share-error-title="Do you have email set up?" data-email-share-error-text="If you're having problems sharing via email, you might not have email set up for your browser. You may need to create a new email yourself." data-email-share-nonce="ef7c195a26" data-email-share-track-url="https://castle-engine.io/wp/2026/08/26/particle-system-updates-custom-shaders-web-support-freecad-x3d-exporter-documentation-exe-size-2d-easy-link-to-api-geometry-shader-fixes/?share=email"> 490 <span id="sharing-email-6208" hidden>Email a link to a friend (Opens in new window)</span> 491 <span>Email</span> 492 </a></li><li class="share-end"></li></ul></div></div></div> </div><!-- .entry-content --> 493 494 495 <a href="https://forum.castle-engine.io/t/particle-system-updates-custom-shaders-web-support-freecad-x3d-exporter-documentation-exe-size-2d-easy-link-to-api-geometry-shader-fixes/2201#comments">Comments on the forum ➤</a> 496</article><!-- #post-## --> 497 498<article id="post-6183" class="post-6183 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized tag-castleengine tag-gamedev tag-pascal tag-webgl tag-windows"> 499 <header class="entry-header"> 500 <p class="news_title_wrapper"><span class="h2 news_title"><a href="https://castle-engine.io/wp/2026/08/02/pointer-lock-mouse-look-on-the-web-plus-a-big-refactor-and-windows-improvements/" rel="bookmark">Pointer lock (mouse look) on the web — plus a big refactor and Windows improvements</a></span></p><p class="news_date_wrapper"><span class="news_date"><span class="screen-reader-text">Posted on</span> <a href="https://castle-engine.io/wp/2026/08/02/pointer-lock-mouse-look-on-the-web-plus-a-big-refactor-and-windows-improvements/" rel="bookmark"><time class="entry-date published updated" datetime="2026-08-02T02:45:52+00:00">August 2, 2026</time></a></span></p> </header><!-- .entry-header --> 501 502 <div class="entry-content"> 503 <table class="thumbnails thumbnails-align-right"><tr><td> 504 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/08/unholy_1.png" 505 class="screenshot" 506 title="&quot;The Unholy Society&quot; - fight with a demon hell-spawn (aka &quot;the kitty&quot;)"><img loading="lazy" decoding="async" 507 style="float: right" 508 src="https://castle-engine.io/wp/wp-content/uploads/2026/08/unholy_1-200x124.png" 509 width="200" height="124" 510 alt="&quot;The Unholy Society&quot; - fight with a demon hell-spawn (aka &quot;the kitty&quot;)" 511 ></a></td></tr><tr><td> 512 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/08/unholy_2.png" 513 class="screenshot" 514 title="&quot;The Unholy Society&quot; - fight with a demon hell-spawn (aka &quot;the kitty&quot;)"><img loading="lazy" decoding="async" 515 style="float: right" 516 src="https://castle-engine.io/wp/wp-content/uploads/2026/08/unholy_2-200x124.png" 517 width="200" height="124" 518 alt="&quot;The Unholy Society&quot; - fight with a demon hell-spawn (aka &quot;the kitty&quot;)" 519 ></a></td></tr><tr><td> 520 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/08/unholy_3.png" 521 class="screenshot" 522 title="&quot;The Unholy Society&quot; - fight with a demon hell-spawn (aka &quot;the kitty&quot;)"><img loading="lazy" decoding="async" 523 style="float: right" 524 src="https://castle-engine.io/wp/wp-content/uploads/2026/08/unholy_3-200x124.png" 525 width="200" height="124" 526 alt="&quot;The Unholy Society&quot; - fight with a demon hell-spawn (aka &quot;the kitty&quot;)" 527 ></a></td></tr></table> 528<p><em>Note that I sent a sneak preview of this news using <a href="https://www.patreon.com/cw/castleengine/quips">Patreon Quip</a> earlier this week. I plan to experiment with Quips more in the future. The “quips” are visible to everyone, you can install the Patreon mobile app to get notifications about them, or just view the <a href="https://www.patreon.com/cw/castleengine/quips">Patreon page with Quips</a>. Of course, I will also continue to send longer posts (on <a href="https://www.patreon.com/cw/castleengine">Patreon</a>, <a href="https://castle-engine.io/wp/">WordPress</a>) about all new engine developments, which you get (if subscribed) by regular email.</em></p> 529<h2>Introduction</h2> 530<p>We have made the <em>pointer lock (mouse look)</em> logic work on the <a href="https://castle-engine.io/web">web</a>, adding also the necessary API to observe when it was <em>cancelled</em> by the user.</p> 531<p>We have also heavily refactored and improved how the <em>pointer lock (mouse look)</em> works on all the other platforms.</p> 532<p>And we made a bonus specifically for Windows: we now perform additional operations to keep the mouse “confined” to the window during <em>pointer lock</em>, even if you have low FPS or move the mouse like crazy.</p> 533<h2>What is pointer lock, mouse look and first demos</h2> 534<p>The <em>mouse look</em> mechanism is used by 3D applications to look around. The idea is that you <em>move the mouse to look around</em>
534. The mouse cursor stays hidden, and the position of the mouse cursor is an internal thing that should not concern the user. For example, test it by right-clicking in:</p> 535<ul> 536<li><a href="https://castle-engine.io/web-demos/examples/3d_games/walking_adventure">Walking Adventure (web build)</a>. Source code <a href="https://github.com/castle-engine/castle-engine/tree/master/examples/3d_games/walking_adventure">here</a>.</p> 537</li> 538<li> 539<p><a href="https://castle-engine.io/web-demos/examples/terrain">Terrain with water (web build)</a>. Source code <a href="https://github.com/castle-engine/castle-engine/tree/master/examples/terrain">here</a>.</p> 540</li> 541<li> 542<p>Our <a href="https://castle-engine.io/editor">editor</a> is naturally a good example of it too. Once you hold <em>right mouse button</em> and look around in the viewport — that’s mouse look. Our <a href="https://castle-engine.io/web-demos/tools/castle-editor-portable/">experimental portable editor (web build)</a> is showing it too.</p> 543</li> 544</ul> 545<p>The more generic name for this idea is <em>“pointer lock”</em> and it can also be used to implement <em>“unbounded dragging”</em>, useful for 2D operations. See examples in:</p> 546<ul> 547<li><a href="https://castle-engine.io/web-demos/examples/user_interface/dragging_test/">Dragging Test (web build)</a>. Source code <a href="https://github.com/castle-engine/castle-engine/tree/master/examples/user_interface/dragging_test">here</a>.</p> 548</li> 549<li> 550<p>The fight minigame in our <a href="https://michalis.xyz/unholy/">The Unholy Society</a>. Dragging the cross freely once you press the mouse button — that relies on pointer lock.</p> 551</li> 552</ul> 553<h2>Special considerations on the web</h2> 554<p>The web platform has important peculiarities around <em>pointer lock</em>.</p> 555<ul> 556<li>You can only request <em>pointer lock</em> in the <a href="https://developer.mozilla.org/en-US/docs/Glossary/Transient_activation">transient activation</a> state, which means it must be triggered by a user interaction (like a mouse click or key press) or right after it.</p> 557</li> 558<li> 559<p>The user can always cancel the pointer lock, you cannot prevent it, and you should not try to immediately “reenter it”. You should instead respect the user’s wish and listen using the <code><a href="https://castle-engine.io/apidoc/html/CastleUIControls.TCastleAbstractPointerLock.html#AddUserCancelledListener-TNotifyEvent-">TCastleAbstractPointerLock.AddUserCancelledListener</a></code> API.</p> 560</li> 561<li> 562<p>We have <a href="https://castle-engine.io/web#pointer_lock">documented this in the section “Pointer lock (mouse look) and handling Escape key in FPS games” for the web platform</a>. See there for example code snippets. Also, all our examples (see below for a full list) should serve as demos how to handle it correctly.</p> 563</li> 564</ul> 565<p>We tested our implementation on <em>Firefox</em>, <em>Vivaldi</em> (Chromium-based) and <em>Google Chrome</em>. It really should work in all browsers, and we adjust to some of the browser-specific “quirks”.</p> 566<h2>All the demos</h2> 567<p>We have many more demos! Here’s a complete list — every one of them has a web build you can try right now, and a link to its source code:</p> 568<ul> 569<li><a href="https://castle-engine.io/web-demos/examples/creature_behaviors/">creature_behaviors</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/creature_behaviors">source</a>)</p> 570</li> 571<li> 572<p><a href="https://castle-engine.io/web-demos/examples/3d_games/dungeons_and_skeletons_fight/">dungeons_and_skeletons_fight</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/3d_games/dungeons_and_skeletons_fight">source</a>)</p> 573</li> 574<li> 575<p><a href="https://castle-engine.io/web-demos/examples/3d_games/explore_impressive_castle/">explore_impressive_castle</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/3d_games/explore_impressive_castle">source</a>)</p> 576</li> 577<li> 578<p><a href="https://castle-engine.io/web-demos/examples/3d_games/walking_adventure/">walking_adventure</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/3d_games/walking_adventure">source</a>)</p> 579</li> 580<li> 581<p><a href="https://castle-engine.io/web-demos/examples/audio/game_3d_sound/">game_3d_sound</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/audio/game_3d_sound">source</a>)</p> 582</li> 583<li> 584<p><a href="https://castle-engine.io/web-demos/examples/research_special_rendering_methods/test_rendering_opengl_capabilities/">test_rendering_opengl_capabilities</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/research_special_rendering_methods/test_rendering_opengl_capabilities">source</a>)</p> 585</li> 586<li> 587<p><a href="https://castle-engine.io/web-demos/examples/terrain/">terrain</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/terrain">source</a>)</p> 588</li> 589<li> 590<p>The physics demos — <a href="https://castle-engine.io/web-demos/examples/physics/physics_3d_shooter/">
590physics_3d_shooter</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/physics/physics_3d_shooter">source</a>), <a href="https://castle-engine.io/web-demos/examples/physics/physics_3d_demo/">physics_3d_demo</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/physics/physics_3d_demo">source</a>), <a href="https://castle-engine.io/web-demos/examples/physics/physics_explosion/">physics_explosion</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/physics/physics_explosion">source</a>) and <a href="https://castle-engine.io/web-demos/examples/physics/physics_throw_chickens/">physics_throw_chickens</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/physics/physics_throw_chickens">source</a>). In all of these, the right click <em>toggles</em> mouse look, so there’s no need to hold it. All except <code>physics_3d_shooter</code> are on the web for the first time.</p> 591</li> 592<li> 593<p><a href="https://castle-engine.io/web-demos/examples/user_interface/dragging_test/">dragging_test</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/user_interface/dragging_test">source</a>) — first time on web, and updated specifically to showcase this.</p> 594</li> 595<li> 596<p><a href="https://castle-engine.io/web-demos/examples/animations/optimize_animations_test/">optimize_animations_test</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/animations/optimize_animations_test">source</a>) — first time on web.</p> 597</li> 598<li> 599<p><a href="https://castle-engine.io/web-demos/examples/window/multiple_windows_and_viewports/">multiple_windows_and_viewports</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/window/multiple_windows_and_viewports">source</a>) — on a desktop, this shows 2 windows, with 2 viewports each, for a total of 4 viewports observing simultaneously the same world. On web, we show only 1 window (since 1 canvas) with 2 viewports.</p> 600</li> 601</ul> 602<h2>Refactors</h2> 603<p>Internally, we have rearranged how “mouse look” works on all the platforms.</p> 604<p>First of all, we have introduced a class <code><a href="https://castle-engine.io/apidoc/html/CastleUIControls.TCastleAbstractPointerLock.html">TCastleAbstractPointerLock</a></code> (and internal descendants) that you can access by <code><a href="https://castle-engine.io/apidoc/html/CastleUIControls.TCastleContainer.html#PointerLock">TCastleContainer.PointerLock</a></code>.</p> 605<p>This makes the engine code easier to adjust. A particular descendant can implement <em>pointer lock</em> in a way best for a particular platform. Right now, we have 3 implementations:</p> 606<ol> 607<li>For the web (<code>TCastleWebPointerLock</code>), using the web <em>pointer lock API</em>. The web browser does the job of hiding and repositioning the mouse for us, in this case. We are prepared for the user cancelling it at any time.</p> 608</li> 609<li> 610<p>Cross-platform for desktops (<code>TCastleDesktopPointerLock</code>). It assumes that setting <code>Window.MousePosition</code> and changing cursor shape (potentially to invisible) works on a given platform.</p> 611</li> 612<li> 613<p>Specialized implementation for Windows (<code>TCastleWindowsPointerLock</code>).</p> 614</li> 615</ol> 616<p>Note that all these classes (<code>TCastleWebPointerLock</code>, <code>TCastleDesktopPointerLock</code>, <code>TCastleWindowsPointerLock</code>) are internal. You don’t use them directly. You only use the abstract <code><a href="https://castle-engine.io/apidoc/html/CastleUIControls.TCastleAbstractPointerLock.html">TCastleAbstractPointerLock</a></code> API.</p> 617<p>Note that mobile platforms typically do such navigation in a different way. See the <a href="https://castle-engine.io/touch_input">“Navigating in 3D on touch devices using TCastleWalkNavigation” section in touch input</a> for an overview of how to make comfortable navigation on mobile. This is not the topic of this news post — we only mention it here for completeness, if anyone wonders “what about phones?”.</p> 618<p>We did a lot of changes to how <em>pointer lock</em> works internally, on all the platforms (including desktops):</p> 619<ul> 620<li>We no longer need to take any <code>ControlRect</code> within which we were repositioning the mouse. We make sure the component controlling the mouse look receives the necessary events, regardless of where it is.</p> 621</li> 622<li> 623<p>We expose new <code><a href="https://castle-engine.io/apidoc/html/CastleKeysMouse.TInputMotion.html#Delta">TInputMotion.Delta</a></code>, simpler to use than old <code>Container.MouseLookDelta</code>.</p> 624</li> 625<li> 626<p>On desktops, hiding the mouse during “mouse look” is now done without touching any public fields like <code>Container.OverrideCursor</code> or <code>TCastleWalkNavigation.Cursor</code>.</p> 627</li> 628</ul> 629<p>While working on this, we also had to improve our <em>input capturing</em> code, which deals with:</p> 630<ul> 631<li><code>ForceCaptureInput</code></li> 632<li>Something that controls pointer lock, like <code><a href="https://castle-engine.io/apidoc/html/CastleCameras.TCastleWalkNavigation.html">TCastleWalkNavigation</a></code>.</li> 633<li>Captured controls, which receive events because you started dragging on them.</li> 634</ul> 635<p>Things are more consistent and reliable in various ways. For example, changing <code>Exists</code> of components is now more consistent: a navigation with <code>Exists</code> = <code>false</code> naturally resigns from controlling the <em>pointer lock</em>.</p> 636<h2>Windows improvements</h2> 637<p>Finally, we have used this opportunity to do some Windows-specific improvements. With the new code organization, it’s easy to extend the mechanism to improve the behavior on a specific platform.</p> 638<p>On Windows we now keep the cursor more reliably within the window during <em>pointer lock</em>, by WinAPI <code>SetCapture</code> + <code>ReleaseCapture</code> <em>and</em> <code>ClipCursor</code> calls. Our approach is a bit similar to what the <em>Godot Engine</em> is doing, so we’re following a proven solution.</p> 639<p>In effect, the mouse will not “escape” from the window when <em>pointer lock</em> is active, even if you’re in a windowed mode, with low FPS, and/or move the mouse with wild speed.</p> 640<p><strong>I hope you enjoy all these details 🙂 Please <a href="https://www.patreon.com/cw/castleengine">support our work on Patreon</a> and have a ton of fun making games during these summer holidays!</strong></p> 641<div class="sharedaddy sd-sharing-enabled"><div class="robots-nocontent sd-block sd-social sd-social-icon-text sd-sharing"><h3 class="sd-title">Share this:</h3><div class="sd-content"><ul><li class="share-bluesky"><a rel="nofollow noopener noreferrer" 642 data-shared="sharing-bluesky-6183" 643 class="share-bluesky sd-button share-icon" 644 href="https://castle-engine.io/wp/2026/08/02/pointer-lock-mouse-look-on-the-web-plus-a-big-refactor-and-windows-improvements/?share=bluesky" 645 target="_blank" 646 aria-labelledby="sharing-bluesky-6183" 647 > 648 <span id="sharing-bluesky-6183" hidden>Share on Bluesky (Opens in new window)</span> 649 <span>Bluesky</span> 650 </a></li><li class="share-mastodon"><a rel="nofollow noopener noreferrer" 651 data-shared="sharing-mastodon-6183" 652 class="share-mastodon sd-button share-icon" 653 href="https://castle-engine.io/wp/2026/08/02/pointer-lock-mouse-look-on-the-web-plus-a-big-refactor-and-windows-improvements/?share=mastodon" 654 target="_blank" 655 aria-labelledby="sharing-mastodon-6183" 656 > 657 <span id="sharing-mastodon-6183" hidden>Share on Mastodon (Opens in new window)</span> 658 <span>Mastodon</span> 659 </a></li><li class="share-facebook"><a rel="nofollow noopener noreferrer" 660 data-shared="sharing-facebook-6183" 661 class="share-facebook sd-button share-icon" 662 href="https://castle-engine.io/wp/2026/08/02/pointer-lock-mouse-look-on-the-web-plus-a-big-refactor-and-windows-improvements/?share=facebook" 663 target="_blank" 664 aria-labelledby="sharing-facebook-6183" 665 > 666 <span id="sharing-facebook-6183" hidden>Share on Facebook (Opens in new window)</span> 667 <span>Facebook</span> 668 </a></li><li class="share-threads"><a rel="nofollow noopener noreferrer" 669 data-shared="sharing-threads-6183" 670 class="share-threads sd-button share-icon" 671 href="https://castle-engine.io/wp/2026/08/02/pointer-lock-mouse-look-on-the-web-plus-a-big-refactor-and-windows-improvements/?share=threads" 672 target="_blank" 673 aria-labelledby="sharing-threads-6183" 674 > 675 <span id="sharing-threads-6183" hidden>Share on Threads (Opens in new window)</span> 676 <span>Threads</span> 677 </a></li><li class="share-linkedin"><a rel="nofollow noopener noreferrer" 678 data-shared="sharing-linkedin-6183" 679 class="share-linkedin sd-button share-icon" 680 href="https://castle-engine.io/wp/2026/08/02/pointer-lock-mouse-look-on-the-web-plus-a-big-refactor-and-windows-improvements/?share=linkedin" 681 target="_blank" 682 aria-labelledby="sharing-linkedin-6183" 683 > 684 <span id="sharing-linkedin-6183" hidden>Share on LinkedIn (Opens in new window)</span> 685 <span>LinkedIn</span> 686 </a></li><li class="share-reddit"><a rel="nofollow noopener noreferrer" 687 data-shared="sharing-reddit-6183" 688 class="share-reddit sd-button share-icon" 689 href="https://castle-engine.io/wp/2026/08/02/pointer-lock-mouse-look-on-the-web-plus-a-big-refactor-and-windows-improvements/?share=reddit" 690 target="_blank" 691 aria-labelledby="sharing-reddit-6183" 692 > 693 <span id="sharing-reddit-6183" hidden>Share on Reddit (Opens in new window)</span> 694 <span>Reddit</span> 695 </a></li><li class="share-email"><a rel="nofollow noopener noreferrer" 696 data-shared="sharing-email-6183" 697 class="share-email sd-button share-icon" 698 href="mailto:?subject=%5BShared%20Post%5D%20Pointer%20lock%20%28mouse%20look%29%20on%20the%20web%20--%20plus%20a%20big%20refactor%20and%20Windows%20improvements&body=https%3A%2F%2Fcastle-engine.io%2Fwp%2F2026%2F08%2F02%2Fpointer-lock-mouse-look-on-the-web-plus-a-big-refactor-and-windows-improvements%2F&share=email" 699 target="_blank" 700 aria-labelledby="sharing-email-6183"
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You may need to create a new email yourself." data-email-share-nonce="ae808f9756" data-email-share-track-url="https://castle-engine.io/wp/2026/08/02/pointer-lock-mouse-look-on-the-web-plus-a-big-refactor-and-windows-improvements/?share=email"> 702 <span id="sharing-email-6183" hidden>Email a link to a friend (Opens in new window)</span> 703 <span>Email</span> 704 </a></li><li class="share-end"></li></ul></div></div></div> </div><!-- .entry-content --> 705 706 707 <a href="https://forum.castle-engine.io/t/pointer-lock-mouse-look-on-the-web-plus-a-big-refactor-and-windows-improvements/2192#comments">Comments on the forum ➤</a> 708</article><!-- #post-## --> 709 710<article id="post-6170" class="post-6170 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized tag-castleengine tag-gamedev tag-gltf tag-pascal tag-x3d"> 711 <header class="entry-header"> 712 <p class="news_title_wrapper"><span class="h2 news_title"><a href="https://castle-engine.io/wp/2026/07/25/toggle-visibility-of-a-group-of-x3d-gltf-nodes/" rel="bookmark">Toggle visibility of a group of X3D / glTF nodes</a></span></p><p class="news_date_wrapper"><span class="news_date"><span class="screen-reader-text">Posted on</span> <a href="https://castle-engine.io/wp/2026/07/25/toggle-visibility-of-a-group-of-x3d-gltf-nodes/" rel="bookmark"><time class="entry-date published updated" datetime="2026-07-25T05:37:01+00:00">July 25, 2026</time></a></span></p> </header><!-- .entry-header --> 713 714 <div class="entry-content"> 715 <table class="thumbnails thumbnails-align-right"><tr><td> 716 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/07/house.png" 717 class="screenshot" 718 title="Free Modular Shed with interior - model by denniswoo1993 from https://sketchfab.com/3d-models/free-modular-shed-with-interior-30b1eb71bb0e4b889160f8283e1750c1"><img loading="lazy" decoding="async" 719 style="float: right" 720 src="https://castle-engine.io/wp/wp-content/uploads/2026/07/house-200x112.png" 721 width="200" height="112" 722 alt="Free Modular Shed with interior - model by denniswoo1993 from https://sketchfab.com/3d-models/free-modular-shed-with-interior-30b1eb71bb0e4b889160f8283e1750c1" 723 ></a></td></tr></table> 724<p>We support now <code>visible</code> field on various <a href="https://castle-engine.io/x3d">X3D nodes</a>:</p> 725<ul> 726<li><code>Inline</code> node. 727<ul> 728<li>This is <code><a href="https://castle-engine.io/apidoc/html/X3DNodes.TInlineNode.html">TInlineNode</a></code> when looking at the graph from Pascal.</li> 729</ul> 730</li> 731<li>and on all <code>X3DGroupingNode</code> descendants, including <code>Transform</code> and <code>Group</code>. 732<ul> 733<li>These are <code><a href="https://castle-engine.io/apidoc/html/X3DNodes.TAbstractGroupingNode.html">TAbstractGroupingNode</a></code>, <code><a href="https://castle-engine.io/apidoc/html/X3DNodes.TTransformNode.html">TTransformNode</a></code>, <code><a href="https://castle-engine.io/apidoc/html/X3DNodes.TGroupNode.html">TGroupNode</a></code> in Pascal.</li> 734</ul> 735</li> 736</ul> 737<p>We also support very similar glTF extension <a href="https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_node_visibility">KHR_node_visibility</a>. The logic of this glTF extension directly maps to X3D <code>visible</code> field.</p> 738<p>The main use-case is to toggle visibility of a group of visual things at run-time. From Pascal code in <em>Castle Game Engine</em>, you can find the <code><a href="https://castle-engine.io/apidoc/html/X3DNodes.TTransformNode.html">TTransformNode</a></code> that interests you using e.g. the <code><a href="https://castle-engine.io/apidoc/html/CastleSceneCore.TCastleSceneCore.html#Node-TX3DNodeClass-String-TFindNodeOptions-">TCastleSceneCore.Node</a></code> method and then toggle the <code>Visible</code> boolean property. If you don’t know what transform nodes are available (e.g. because you load model in other format, like glTF) then inspect it, by first saving it to X3D using e.g. our <a href="https://castle-engine.io/castle-model-viewer">Castle Model Viewer</a>, and then open X3D in any text editor.</p> 739<p>As a testcase, open <code>x3d/visible_toggling.x3dv</code> in our demo-models repository, <a href="https://github.com/castle-engine/demo-models/">https://github.com/castle-engine/demo-models/</a> . We recommend to just get the whole repository (<code>git clone ...</code>) to have all files. It shows spheres (some visible, some hidden by default) and allows toggling “visible” at runtime (using <code>KeySensor.controlKey</code> routed to “visible” fields).</p> 740<p>For more notes see API docs on <a href="https://castle-engine.io/apidoc/html/X3DNodes.TAbstractGroupingNode.html#Visible">TAbstractGroupingNode.Visible</a>.</p> 741<p>TODO:</p> 742<ul> 743<li>Both the X3D and glTF features specifications’
743 say to also disable light and fog nodes within a group that you made invisible. We don’t implement this yet — for now, the <code>Visible</code> field only affects the visibility of <em>shapes</em>. If you use this feature, be aware that <em>we will toggle lights and fog</em> in the future too.</p> 744</li> 745<li> 746<p>In case of glTF, it would be great to also support <a href="https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_animation_pointer">KHR_animation_pointer</a>. This is a bit like X3D routes: allows to animate almost every part of the glTF, in particular it allows to animate the visibility defined by <code>KHR_node_visibility</code>.</p> 747</li> 748</ul> 749<p>If you enjoy this, please <a href="https://www.patreon.com/c/castleengine">support our work on Patreon</a>!</p> 750<p><em>Our screenshot shows <a href="https://sketchfab.com/3d-models/free-modular-shed-with-interior-30b1eb71bb0e4b889160f8283e1750c1">house 3D model by denniswoo1993</a>. Not really related to the feature described here, just something pretty arranged in our editor:)</em></p> 751<div class="sharedaddy sd-sharing-enabled"><div class="robots-nocontent sd-block sd-social sd-social-icon-text sd-sharing"><h3 class="sd-title">Share this:</h3><div class="sd-content"><ul><li class="share-bluesky"><a rel="nofollow noopener noreferrer" 752 data-shared="sharing-bluesky-6170" 753 class="share-bluesky sd-button share-icon" 754 href="https://castle-engine.io/wp/2026/07/25/toggle-visibility-of-a-group-of-x3d-gltf-nodes/?share=bluesky" 755 target="_blank" 756 aria-labelledby="sharing-bluesky-6170" 757 > 758 <span id="sharing-bluesky-6170" hidden>Share on Bluesky (Opens in new window)</span> 759 <span>Bluesky</span> 760 </a></li><li class="share-mastodon"><a rel="nofollow noopener noreferrer" 761 data-shared="sharing-mastodon-6170" 762 class="share-mastodon sd-button share-icon" 763 href="https://castle-engine.io/wp/2026/07/25/toggle-visibility-of-a-group-of-x3d-gltf-nodes/?share=mastodon" 764 target="_blank" 765 aria-labelledby="sharing-mastodon-6170" 766 > 767 <span id="sharing-mastodon-6170" hidden>Share on Mastodon (Opens in new window)</span> 768 <span>Mastodon</span> 769 </a></li><li class="share-facebook"><a rel="nofollow noopener noreferrer" 770 data-shared="sharing-facebook-6170" 771 class="share-facebook sd-button share-icon" 772 href="https://castle-engine.io/wp/2026/07/25/toggle-visibility-of-a-group-of-x3d-gltf-nodes/?share=facebook" 773 target="_blank" 774 aria-labelledby="sharing-facebook-6170" 775 > 776 <span id="sharing-facebook-6170" hidden>Share on Facebook (Opens in new window)</span> 777 <span>Facebook</span> 778 </a></li><li class="share-threads"><a rel="nofollow noopener noreferrer" 779 data-shared="sharing-threads-6170" 780 class="share-threads sd-button share-icon" 781 href="https://castle-engine.io/wp/2026/07/25/toggle-visibility-of-a-group-of-x3d-gltf-nodes/?share=threads" 782 target="_blank" 783 aria-labelledby="sharing-threads-6170" 784 > 785 <span id="sharing-threads-6170" hidden>Share on Threads (Opens in new window)</span> 786 <span>Threads</span> 787 </a></li><li class="share-linkedin"><a rel="nofollow noopener noreferrer" 788 data-shared="sharing-linkedin-6170" 789 class="share-linkedin sd-button share-icon" 790 href="https://castle-engine.io/wp/2026/07/25/toggle-visibility-of-a-group-of-x3d-gltf-nodes/?share=linkedin" 791 target="_blank" 792 aria-labelledby="sharing-linkedin-6170" 793 > 794 <span id="sharing-linkedin-6170" hidden>Share on LinkedIn (Opens in new window)</span> 795 <span>LinkedIn</span> 796 </a></li><li class="share-reddit"><a rel="nofollow noopener noreferrer" 797 data-shared="sharing-reddit-6170" 798 class="share-reddit sd-button share-icon" 799 href="https://castle-engine.io/wp/2026/07/25/toggle-visibility-of-a-group-of-x3d-gltf-nodes/?share=reddit" 800 target="_blank" 801 aria-labelledby="sharing-reddit-6170" 802 > 803 <span id="sharing-reddit-6170" hidden>Share on Reddit (Opens in new window)</span> 804 <span>Reddit</span> 805 </a></li><li class="share-email"><a rel="nofollow noopener noreferrer" 806 data-shared="sharing-email-6170" 807 class="share-email sd-button share-icon" 808 href="mailto:?subject=%5BShared%20Post%5D%20Toggle%20visibility%20of%20a%20group%20of%20X3D%20%2F%20glTF%20nodes&body=https%3A%2F%2Fcastle-engine.io%2Fwp%2F2026%2F07%2F25%2Ftoggle-visibility-of-a-group-of-x3d-gltf-nodes%2F&share=email" 809 target="_blank" 810 aria-labelledby="sharing-email-6170"
811 data-email-share-error-title="Do you have email set up?" data-email-share-error-text="If you're having problems sharing via email, you might not have email set up for your browser. You may need to create a new email yourself." data-email-share-nonce="3e96fc3c44" data-email-share-track-url="https://castle-engine.io/wp/2026/07/25/toggle-visibility-of-a-group-of-x3d-gltf-nodes/?share=email"> 812 <span id="sharing-email-6170" hidden>Email a link to a friend (Opens in new window)</span> 813 <span>Email</span> 814 </a></li><li class="share-end"></li></ul></div></div></div> </div><!-- .entry-content --> 815 816 817 <a href="https://forum.castle-engine.io/t/toggle-visibility-of-a-group-of-x3d-gltf-nodes/2188#comments">Comments on the forum (2) ➤</a> 818</article><!-- #post-## --> 819 820<article id="post-6159" class="post-6159 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized tag-castleengine tag-gamedev tag-pascal tag-shaders tag-webgl"> 821 <header class="entry-header"> 822 <p class="news_title_wrapper"><span class="h2 news_title"><a href="https://castle-engine.io/wp/2026/07/17/web-water-terrain-shadow-maps-alpha-treatment-keys-on-losing-focus/" rel="bookmark">Web: water, terrain, shadow maps, alpha treatment, keys on losing focus</a></span></p><p class="news_date_wrapper"><span class="news_date"><span class="screen-reader-text">Posted on</span> <a href="https://castle-engine.io/wp/2026/07/17/web-water-terrain-shadow-maps-alpha-treatment-keys-on-losing-focus/" rel="bookmark"><time class="entry-date published updated" datetime="2026-07-17T19:58:48+00:00">July 17, 2026</time></a></span></p> </header><!-- .entry-header --> 823 824 <div class="entry-content"> 825 <table class="thumbnails thumbnails-align-right"><tr><td> 826 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/07/1_terrain.png" 827 class="screenshot" 828 title="Terrain + water demo on web"><img loading="lazy" decoding="async" 829 style="float: right" 830 src="https://castle-engine.io/wp/wp-content/uploads/2026/07/1_terrain-200x137.png" 831 width="200" height="137" 832 alt="Terrain + water demo on web" 833 ></a></td></tr><tr><td> 834 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/07/2_shrine.png" 835 class="screenshot" 836 title="Shadow maps on web"><img loading="lazy" decoding="async" 837 style="float: right" 838 src="https://castle-engine.io/wp/wp-content/uploads/2026/07/2_shrine-200x139.png" 839 width="200" height="139" 840 alt="Shadow maps on web" 841 ></a></td></tr><tr><td> 842 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/07/5_walking_trees.png" 843 class="screenshot" 844 title="Walking Adventure - tree on web"><img loading="lazy" decoding="async" 845 style="float: right" 846 src="https://castle-engine.io/wp/wp-content/uploads/2026/07/5_walking_trees-200x139.png" 847 width="200" height="139" 848 alt="Walking Adventure - tree on web" 849 ></a></td></tr><tr><td> 850 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/07/4_platformer.png" 851 class="screenshot" 852 title="Platformer on web"><img loading="lazy" decoding="async" 853 style="float: right" 854 src="https://castle-engine.io/wp/wp-content/uploads/2026/07/4_platformer-200x139.png" 855 width="200" height="139" 856 alt="Platformer on web" 857 ></a></td></tr><tr><td> 858 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/07/3_aberration.png" 859 class="screenshot" 860 title="Chromatic aberration on web"><img loading="lazy" decoding="async" 861 style="float: right" 862 src="https://castle-engine.io/wp/wp-content/uploads/2026/07/3_aberration-200x132.png" 863 width="200" height="132" 864 alt="Chromatic aberration on web" 865 ></a></td></tr></table> 866<p>Rendering to texture (FBO, our <code><a href="https://castle-engine.io/apidoc/html/CastleGLImages.TGLRenderToTexture.html">TGLRenderToTexture</a></code>) works now on the <a href="https://castle-engine.io/web">web</a>.</p> 867<p>This enables a few features on the web:</p> 868<ul> 869<li>Water, with reflections and waves, visible in the <a href="https://castle-engine.io/web-demos/examples/terrain/">terrain demo</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/terrain">source code in examples/terrain/</a>) is correct now on the web.</p> 870</li> 871<li> 872<p><a href="https://castle-engine.io/screen_effects">Screen (Post-Processing) Effects</a> work on the web now.</p> 873<ul> 874<li><a href="https://castle-engine.io/web-demos/examples/screen_effects_demo/">screen_effects_demo demo</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/screen_effects_demo">source code in examples/screen_effects_demo/</a>).</p> 875</li> 876<li> 877<p><a href="https://castle-engine.io/web-demos/castle-model-viewer-mobile/">Model viewer</a> includes demos of screen effects: switch to demos of <em>Defocus</em>, and <em>Chromatic Aberration</em>.</p> 878</li> 879</ul> 880</li> 881<li> 882<p><a href="https://castle-engine.io/shadow_maps">Shadow maps</a> work now correctly on the web.</p> 883<ul> 884<li>Our <a href="https://castle-engine.io/web-demos/castle-model-viewer-mobile/">model viewer</a> includes 2 demos: switch to <em>“Shinto Shrine”</em> and <em>“Simple Shadow Maps”</em> models (scroll down in the <em>“Open”</em> panel to see them).</p> 885</li> 886<li> 887<p>Another demo: <a href="https://castle-engine.io/web-demos/examples/research_special_rendering_methods/test_rendering_opengl_capabilities/">test_rendering_opengl_capabilities demo</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/research_special_rendering_methods/test_rendering_opengl_capabilities">source code in examples/research_special_rendering_methods/test_rendering_opengl_capabilities/</a>) (walk to the <em>“Some text”</em> geometry over which a moving sphere casts a shadow).</p> 888</li> 889<li> 890<p>Note: We plan a <a href="https://castle-engine.io/roadmap#shadow_maps">big upgrade to shadow maps</a>, making using them in the engine much more natural. So stay tuned for more/better demos of shadow maps:)</p> 891</li> 892</ul> 893</li> 894</ul> 895<p>We also fixed <em>alpha treatment</em> on the <a href="https://castle-engine.io/web">web</a>.</p> 896<ul> 897<li>This fixes a few subtle bugs, as in various edge-cases we wrote to the color buffer pixels with alpha < 1. This happened e.g. when displaying hearts in the <a href="https://castle-engine.io/web-demos/examples/2d_games/platformer/">platformer demo</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/2d_games/platformer">source code in examples/2d_games/platformer/</a>), cat hair in model viewer, tree leaves in the <a href="https://castle-engine.io/web-demos/examples/3d_games/walking_adventure/">walking adventure demo</a> (<a href="https://github.com/castle-engine/castle-engine/tree/master/examples/3d_games/walking_adventure">source code in examples/3d_games/walking_adventure/</a>).</p> 898</li> 899<li> 900<p>This was harmless on non-web platforms (where pixel alpha of the color buffer is used only for eventual blending with incoming colors; nothing cares what is the final calculated alpha left in the buffer). But on web, in the past, our canvas was using <em>“blending with page background (typically white)”</em>.</p> 901</li> 902<li> 903<p>This is fixed now, making the web rendering work just like other platforms. See <a href="https://github.com/castle-engine/castle-engine/blob/a28b45bc1bd9f6bda7376e83a34bf71eea45b023/src/window/castlewindow_webassembly.inc#L148">comment here</a> for more information.</p> 904</li> 905</ul> 906<p>We now correctly “reset” keys pressed state after you switch a browser page or application:</p> 907<ul> 908<li>Previously, switching tabs or applications by key combo like <em>Ctrl+Tab</em>, <em>Alt+Tab</em> could leave the engine thinking that <em>“Ctrl”</em> or <em>“Tab”</em> are pressed.</p> 909</li> 910<li> 911<p>This had some consequences, e.g. <code><a href="https://castle-engine.io/apidoc/html/CastleCameras.TCastleWalkNavigation.html">TCastleWalkNavigation</a></code> will refuse movement by AWSD if it thinks that you hold down <em>Ctrl/Alt</em> modifier. (And it will do “run” if it thinks you hold down <em>Shift</em>!)</p> 912</li> 913<li> 914<p>This is fixed now, we react to <a href="https://developer.mozilla.org/en-US/docs/Web/API/Window/blur_event">blur</a> event by switching all keys “up”.</p> 915</li> 916</ul> 917<p>We have also fixed both terrain and water shaders for <em>Chromium</em>-based browsers (like <a href="https://vivaldi.com/">Vivaldi</a> or <em>Google Chrome</em>). They needed <code>highp</code> in certain shaders to work reliably (water waves, terrain textures smooth), as they multiply bigger floats with small floats.</p> 918<p>As always, we hope you have fun developing games with <em>Castle Game Engine</em>! And if you like what we do, we <a href="https://www.patreon.com/c/castleengine">appreciate support on Patreon</a>!</p> 919<div class="sharedaddy sd-sharing-enabled"><div class="robots-nocontent sd-block sd-social sd-social-icon-text sd-sharing"><h3 class="sd-title">Share this:</h3><div class="sd-content"><ul><li class="share-bluesky"><a rel="nofollow noopener noreferrer" 920 data-shared="sharing-bluesky-6159" 921 class="share-bluesky sd-button share-icon" 922 href="https://castle-engine.io/wp/2026/07/17/web-water-terrain-shadow-maps-alpha-treatment-keys-on-losing-focus/?share=bluesky" 923 target="_blank" 924 aria-labelledby="sharing-bluesky-6159" 925 > 926 <span id="sharing-bluesky-6159" hidden>Share on Bluesky (Opens in new window)</span> 927 <span>Bluesky</span> 928 </a></li><li class="share-mastodon"><a rel="nofollow noopener noreferrer" 929 data-shared="sharing-mastodon-6159" 930 class="share-mastodon sd-button share-icon" 931 href="https://castle-engine.io/wp/2026/07/17/web-water-terrain-shadow-maps-alpha-treatment-keys-on-losing-focus/?share=mastodon" 932 target="_blank" 933 aria-labelledby="sharing-mastodon-6159" 934 > 935 <span id="sharing-mastodon-6159" hidden>Share on Mastodon (Opens in new window)</span> 936 <span>Mastodon</span> 937 </a></li><li class="share-facebook"><a rel="nofollow noopener noreferrer" 938 data-shared="sharing-facebook-6159" 939 class="share-facebook sd-button share-icon" 940 href="https://castle-engine.io/wp/2026/07/17/web-water-terrain-shadow-maps-alpha-treatment-keys-on-losing-focus/?share=facebook" 941 target="_blank" 942 aria-labelledby="sharing-facebook-6159" 943 > 944 <span id="sharing-facebook-6159" hidden>Share on Facebook (Opens in new window)</span> 945 <span>Facebook</span> 946 </a></li><li class="share-threads"><a rel="nofollow noopener noreferrer" 947 data-shared="sharing-threads-6159" 948 class="share-threads sd-button share-icon" 949 href="https://castle-engine.io/wp/2026/07/17/web-water-terrain-shadow-maps-alpha-treatment-keys-on-losing-focus/?share=threads" 950 target="_blank" 951 aria-labelledby="sharing-threads-6159" 952 > 953 <span id="sharing-threads-6159" hidden>Share on Threads (Opens in new window)</span> 954 <span>Threads</span> 955 </a></li><li class="share-linkedin"><a rel="nofollow noopener noreferrer" 956 data-shared="sharing-linkedin-6159" 957 class="share-linkedin sd-button share-icon" 958 href="https://castle-engine.io/wp/2026/07/17/web-water-terrain-shadow-maps-alpha-treatment-keys-on-losing-focus/?share=linkedin" 959 target="_blank" 960 aria-labelledby="sharing-linkedin-6159" 961 > 962 <span id="sharing-linkedin-6159" hidden>Share on LinkedIn (Opens in new window)</span> 963 <span>LinkedIn</span> 964 </a></li><li class="share-reddit"><a rel="nofollow noopener noreferrer" 965 data-shared="sharing-reddit-6159" 966 class="share-reddit sd-button share-icon" 967 href="https://castle-engine.io/wp/2026/07/17/web-water-terrain-shadow-maps-alpha-treatment-keys-on-losing-focus/?share=reddit" 968 target="_blank" 969 aria-labelledby="sharing-reddit-6159" 970 > 971 <span id="sharing-reddit-6159" hidden>Share on Reddit (Opens in new window)</span> 972 <span>Reddit</span> 973 </a></li><li class="share-email"><a rel="nofollow noopener noreferrer" 974 data-shared="sharing-email-6159" 975 class="share-email sd-button share-icon" 976 href="mailto:?subject=%5BShared%20Post%5D%20Web%3A%20water%2C%20terrain%2C%20shadow%20maps%2C%20alpha%20treatment%2C%20keys%20on%20losing%20focus&body=https%3A%2F%2Fcastle-engine.io%2Fwp%2F2026%2F07%2F17%2Fweb-water-terrain-shadow-maps-alpha-treatment-keys-on-losing-focus%2F&share=email" 977 target="_blank" 978 aria-labelledby="sharing-email-6159"
979 data-email-share-error-title="Do you have email set up?" data-email-share-error-text="If you're having problems sharing via email, you might not have email set up for your browser. You may need to create a new email yourself." data-email-share-nonce="6ea6722221" data-email-share-track-url="https://castle-engine.io/wp/2026/07/17/web-water-terrain-shadow-maps-alpha-treatment-keys-on-losing-focus/?share=email"> 980 <span id="sharing-email-6159" hidden>Email a link to a friend (Opens in new window)</span> 981 <span>Email</span> 982 </a></li><li class="share-end"></li></ul></div></div></div> </div><!-- .entry-content --> 983 984 985 <a href="https://forum.castle-engine.io/t/web-water-terrain-shadow-maps-alpha-treatment-keys-on-losing-focus/2186#comments">Comments on the forum ➤</a> 986</article><!-- #post-## --> 987 988<article id="post-6149" class="post-6149 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized tag-castleengine tag-codesigning tag-gamedev tag-pascal tag-windows"> 989 <header class="entry-header"> 990 <p class="news_title_wrapper"><span class="h2 news_title"><a href="https://castle-engine.io/wp/2026/07/14/windows-downloads-now-code-signed-no-more-smart-app-control-blocks-plus-smaller-downloads-7z-tar-xz/" rel="bookmark">Windows downloads now code-signed – no more Smart App Control blocks. Plus smaller downloads (7z, tar.xz)</a></span></p><p class="news_date_wrapper"><span class="news_date"><span class="screen-reader-text">Posted on</span> <a href="https://castle-engine.io/wp/2026/07/14/windows-downloads-now-code-signed-no-more-smart-app-control-blocks-plus-smaller-downloads-7z-tar-xz/" rel="bookmark"><time class="entry-date published updated" datetime="2026-07-14T23:45:32+00:00">July 14, 2026</time></a></span></p> </header><!-- .entry-header --> 991 992 <div class="entry-content"> 993 <table class="thumbnails thumbnails-align-right"><tr><td> 994 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/07/Zrzut-ekranu-2026-07-15-013929.png" 995 class="screenshot" 996 title="Editor code-signed on Windows"><img loading="lazy" decoding="async" 997 style="float: right" 998 src="https://castle-engine.io/wp/wp-content/uploads/2026/07/Zrzut-ekranu-2026-07-15-013929-200x103.png" 999 width="200" height="103" 1000 alt="Editor code-signed on Windows" 1001 ></a></td></tr></table> 1002<p>Our <a href="https://castle-engine.io/download">downloads</a> for Windows include now all the executables <em>code-signed</em>, which means that they are trusted and running the engine will raise fewer alarms from various Windows protection tools. In particular, <em>“Smart App Control”</em> (mentioned also in <a href="https://castle-engine.io/wp/2026/06/28/tcastleprocess-and-executecommand-available-with-both-fpc-and-delphi-no-more-cryptic-failed-to-execute-4551-when-windows-smart-app-control-blocks-us/">past news</a>) will no longer block us, randomly preventing you from running compilers or your applications. This applies to all our downloads, including the automatic snapshots made after every commit+push.</p> 1003<p>We have also decreased a bit the size of our downloads, thanks to a small de-duplication fix and using more compressed formats for some systems (tar.xz for Linux, 7z for Windows).</p> 1004<p>Let this also be an occasion to ask for <a href="https://www.patreon.com/c/castleengine">your support on Patreon</a>. Your support really matters, enabling me to spend more time working on the engine. Our “infrastructure costs” are rising — the signing, employed now, will cost us an extra 120 USD / year (this comes on top of Apple membership costs, servers costs, domains etc., and on top of my cost of living 🙂 ).</p> 1005<p><em>That was the short version of the news 🙂</em></p> 1006<p>What follows is a detailed description of how / why we did the signing. I hope it is interesting, in particular if you wonder how to code-sign on Windows yourself, but admittedly there’s a lot of “gory” details below. Read on if you’re brave!</p> 1007<h2>Various solutions to sign on Windows</h2> 1008<p>We have done a lot of research about how / which signing solution to use:</p> 1009<ol> 1010<li>I rejected usage of <em>Certum</em> certificates. They are cheap, but using them with CI <a href="https://github.com/reactiveui/actions-common/blob/main/.github/actions/certum-sign/action.yml">requires quite some hack with Docker executing GUI application inside</a>. I don’t believe this will be maintainable for a long-run, as we try to use it also for CI builds.</p> 1011</li> 1012<li> 1013<p>I had high hopes but in the end resigned from <a href="https://signpath.org/">using SignPath Foundation for OSS projects</a>. It’s a great initiative for open-source projects, <em>“SignPath Foundation”</em> can provide you with tools and sign your executables for free. However, it wasn’t a fit for us:</p> 1014<ul> 1015<li>
1015The process puts some constraints how we can use signing, in particular it is not allowed to sign 3rd-party tools (this means bundled FPC in our case) we ship with our engine. See their <a href="https://signpath.org/terms.html">terms</a>.</p> 1016</li> 1017<li> 1018<p>It also has additional constraints: <em>“Every release needs manual approval for signing.”</em>, signing 48 GB / year. So it’s not really for CI snapshots, only for “real” stable releases (which we should do more often, but that’s another story 🙂 ).</p> 1019</li> 1020<li> 1021<p>It would also practically tie us to GitHub, since their <a href="https://docs.signpath.io/trusted-build-systems/">Trusted Build Systems</a> for OSS support only <em>GitHub Actions</em> or <em>AppVeyor</em>, you cannot build anywhere else. And I want to avoid being limited to only these 2 CI systems — I <a href="https://castle-engine.io/wp/2026/01/18/engine-downloads-with-bundled-fpc-for-all-platforms-castle-build-ci-to-easily-use-ci-with-our-engine-woodpecker-codeberg-ci-examples-and-impressions/">like Codeberg more and more, and GitHub less and less</a> and I want to keep our migration options open 🙂</p> 1022</li> 1023</ul> 1024</li> 1025<li> 1026<p>I eventually settled on <a href="https://azure.microsoft.com/en-us/products/artifact-signing">Azure Artifact Signing</a> (formerly known as <em>Azure Trusted Signing</em>), a signing service straight from Microsoft.</p> 1027<ul> 1028<li>It costs (10 USD / m) but it gives us the flexibility we need.</p> 1029</li> 1030<li> 1031<p>Tooling is really good and cross-platform. One can build any script on top of Windows <code>signtool</code> or cross-platform <a href="https://ebourg.github.io/jsign/#example-trustedsigning">jsign</a>.</p> 1032</li> 1033<li> 1034<p>We can sign everything — engine tools, and compiler we use.</p> 1035</li> 1036<li> 1037<p>It’s really well made to work in CI. The way <a href="https://github.com/azure/login">Azure Login</a> works with <a href="https://github.com/azure/login#login-with-openid-connect-oidc-recommended">OIDC (OpenID Connect)</a> was new to me, and really cool. It took some time to understand and set up… but the end result is really nice. It means that CI system (which can be GitHub, but also <a href="https://codeberg.org/forgejo/forgejo/pulls/10481">Forgejo implements OIDC workload identity federation</a>) creates a token, authenticating that this is a particular project on a particular branch. <strong>There’s no need to establish/exchange any secret (that would be an attack possibility on our Azure account) to make signing work from CI.</strong></p> 1038</li> 1039<li> 1040<p>Note: this is not available for individuals outside US/Canada, but luckily I’m a <a href="https://castle-engine.io/donate">company in Poland</a> so we are eligible for it.</p> 1041</li> 1042</ul> 1043</li> 1044</ol> 1045<p>All in all, we have a reliable system, and you shall see all our executables on Windows signed by <em>“Castle Game Engine – Michalis Kamburelis”</em>.</p> 1046<h2>Our scripts to sign in castle-build-ci</h2> 1047<p>Our <a href="https://github.com/castle-engine/castle-build-ci/">castle-build-ci</a> repository has now <em>bash</em> scripts to perform signing using <em>Azure Artifact Signing</em>. You’re welcome to use them too, they are generic and <a href="https://github.com/castle-engine/castle-build-ci/tree/master/windows">documented in castle-build-ci/windows</a>.</p> 1048<p>As with <a href="https://github.com/castle-engine/castle-build-ci/tree/master/apple">Apple signing scripts (already done in the past)</a>, I decided to design this as <em>bash scripts</em> (portable to all systems, including <em>Windows</em>, and of course all <em>Unix</em> like <em>Linux, FreeBSD, macOS</em>). This is in contrast to using <a href="https://github.com/Azure/artifact-signing-action">ready GitHub Actions for signing, like this one</a>. Why bash scripts? I explained the reasons in <a href="https://github.com/castle-engine/castle-build-ci/tree/master/windows#why-express-this-as-bash-scripts-not-github-actions">detail here</a>, in short:</p> 1049<ul> 1050<li>Having this as bash script is more powerful: can be used in the middle of another bash script. And can be passed as <a href="https://github.com/castle-engine/castle-engine/blob/7327fba69f98d11cf5fc7863a5040ead4e25bd94/tools/internal/pack_release/pack_release.sh#L770"><em>InnoSetup</em> command to sign uninstaller too</a>.</p> 1051</li> 1052<li> 1053<p>bash script can be tested on a local system, i.e. I can just use the same scripts to sign locally, not in CI. I found this to be a great help when debugging — I don’t need to wait for <em>GitHub Actions</em> to perform first test of the scripts.</p> 1054</li> 1055<li> 1056<p>It keeps us more independent from <em>GitHub Actions</em>, which is desirable for me, as I’m really looking forward to jump to <em>Codeberg</em>, and we already test their <a href="https://castle-engine.io/wp/2026/01/18/engine-downloads-with-bundled-fpc-for-all-platforms-castle-build-ci-to-easily-u
1056se-ci-with-our-engine-woodpecker-codeberg-ci-examples-and-impressions/">Woodpecker CI</a>. <em>Forgejo Actions</em> may also be a viable option at some point. I <em>do not want</em> to depend on GitHub for our engine existence.</p> 1057</li> 1058</ul> 1059<h2>Signing everything!</h2> 1060<p><a href="https://github.com/castle-engine/castle-fpc">FPC builds from castle-fpc</a> are now signed, on both macOS and Windows.</p> 1061<p><a href="https://github.com/castle-engine/castle-lazarus/">Lazarus builds from castle-lazarus</a> are now signed too, on both macOS and Windows. We don’t bundle it with CGE for now, but it’s ready.</p> 1062<p>Our Castle Game Engine releases are now signed, by our <a href="https://github.com/castle-engine/castle-engine/blob/master/tools/internal/pack_release/pack_release.sh">pack_release.sh</a> script (controlled by <a href="https://github.com/castle-engine/castle-engine/blob/master/.github/workflows/test-and-pack-runner-native.yml">GitHub Action workflows</a>). Everything is signed:</p> 1063<ul> 1064<li>All our tools are signed (<code>castle-engine</code>, <code>castle-editor</code>, <code>castle-model-viewer</code>…).</li> 1065<li>Installer and uninstaller are signed.</li> 1066<li><code>pasls</code> (LSP for <a href="https://castle-engine.io/vscode">VS Code and other editors</a>) is signed.</li> 1067<li>And bundled FPC is signed, as mentioned above.</li> 1068</ul> 1069<p>Finally, standalone snapshot releases of our viewers are also signed:</p> 1070<ul> 1071<li><a href="https://castle-engine.io/castle-model-viewer">Castle Model Viewer (and converter)</a></li> 1072<li><a href="https://castle-engine.io/castle-image-viewer">Castle Image Viewer</a></li> 1073</ul> 1074<p>The tests confirm this is now good and makes Windows happy. I can install our engine, run editor, see detected (bundled) FPC version, create new project, build it and run — and everything works even with the dreaded <em>“Smart App Control”</em> turned <em>“On”</em>.</p> 1075<p>Our <a href="https://castle-engine.io/vscode">Pascal Language Server, used by VS Code / VS Codium extension</a> also works without any fuss, as it is also signed.</p> 1076<h2>Size optimizations</h2> 1077<p>We also did some size optimizations, since we’re aware the engine downloads are big, and we’re looking for ways to trim them down (ideally: still keeping examples as part of default downloads).</p> 1078<ul> 1079<li>We found and removed duplicated binaries of our tools. These needlessly inflated download size by 40-70 MB (depending on system) — fixed now.</p> 1080</li> 1081<li> 1082<p>We added alternative archives compressed by 7z (for Windows) and tar.xz (for Linux). These have much smaller sizes than simple zip, lowering download size by ~250 MB (for tar.xz) and even 300+ MB (for 7z). No loss of functionality, just better compression!</p> 1083<ul> 1084<li>So, we will continue to <a href="https://github.com/castle-engine/castle-engine/releases/tag/snapshot">provide zip versions, for maximum compatibility</a>…</li> 1085<li>but our <a href="https://castle-engine.io/download">default downloads</a> now lead to smaller tar.xz on Linux.</li> 1086<li>(On Windows, we still lead to InnoSetup installer, which is already a better compression than plain zip.)</li> 1087</ul> 1088</li> 1089<li>We also removed “non bundled” download archives, because maintaining them was becoming too much work, our GHA scripts were getting quite complicated. They were only available for 2 platforms (<em>win64/x86_64</em> and <em>linux/x86_64</em>) and the size gain from not bundling FPC was < 100 MB after above optimizations.</p> 1090</li> 1091</ul> 1092<h2>Thank you!</h2> 1093<p>
1093Woah. This was a big infrastructure change, to make all our Windows stuff signed. Enjoy!</p> 1094<p>And if you like what we do, and like our long news posts :), please <a href="https://www.patreon.com/c/castleengine">support us on Patreon</a>.</p> 1095<div class="sharedaddy sd-sharing-enabled"><div class="robots-nocontent sd-block sd-social sd-social-icon-text sd-sharing"><h3 class="sd-title">Share this:</h3><div class="sd-content"><ul><li class="share-bluesky"><a rel="nofollow noopener noreferrer" 1096 data-shared="sharing-bluesky-6149" 1097 class="share-bluesky sd-button share-icon" 1098 href="https://castle-engine.io/wp/2026/07/14/windows-downloads-now-code-signed-no-more-smart-app-control-blocks-plus-smaller-downloads-7z-tar-xz/?share=bluesky" 1099 target="_blank" 1100 aria-labelledby="sharing-bluesky-6149" 1101 > 1102 <span id="sharing-bluesky-6149" hidden>Share on Bluesky (Opens in new window)</span> 1103 <span>Bluesky</span> 1104 </a></li><li class="share-mastodon"><a rel="nofollow noopener noreferrer" 1105 data-shared="sharing-mastodon-6149" 1106 class="share-mastodon sd-button share-icon" 1107 href="https://castle-engine.io/wp/2026/07/14/windows-downloads-now-code-signed-no-more-smart-app-control-blocks-plus-smaller-downloads-7z-tar-xz/?share=mastodon" 1108 target="_blank" 1109 aria-labelledby="sharing-mastodon-6149" 1110 > 1111 <span id="sharing-mastodon-6149" hidden>Share on Mastodon (Opens in new window)</span> 1112 <span>Mastodon</span> 1113 </a></li><li class="share-facebook"><a rel="nofollow noopener noreferrer" 1114 data-shared="sharing-facebook-6149" 1115 class="share-facebook sd-button share-icon" 1116 href="https://castle-engine.io/wp/2026/07/14/windows-downloads-now-code-signed-no-more-smart-app-control-blocks-plus-smaller-downloads-7z-tar-xz/?share=facebook" 1117 target="_blank" 1118 aria-labelledby="sharing-facebook-6149" 1119 > 1120 <span id="sharing-facebook-6149" hidden>Share on Facebook (Opens in new window)</span> 1121 <span>Facebook</span> 1122 </a></li><li class="share-threads"><a rel="nofollow noopener noreferrer" 1123 data-shared="sharing-threads-6149" 1124 class="share-threads sd-button share-icon" 1125 href="https://castle-engine.io/wp/2026/07/14/windows-downloads-now-code-signed-no-more-smart-app-control-blocks-plus-smaller-downloads-7z-tar-xz/?share=threads" 1126 target="_blank" 1127 aria-labelledby="sharing-threads-6149" 1128 > 1129 <span id="sharing-threads-6149" hidden>Share on Threads (Opens in new window)</span> 1130 <span>Threads</span> 1131 </a></li><li class="share-linkedin"><a rel="nofollow noopener noreferrer" 1132 data-shared="sharing-linkedin-6149" 1133 class="share-linkedin sd-button share-icon" 1134 href="https://castle-engine.io/wp/2026/07/14/windows-downloads-now-code-signed-no-more-smart-app-control-blocks-plus-smaller-downloads-7z-tar-xz/?share=linkedin" 1135 target="_blank" 1136 aria-labelledby="sharing-linkedin-6149" 1137 > 1138 <span id="sharing-linkedin-6149" hidden>Share on LinkedIn (Opens in new window)</span> 1139 <span>LinkedIn</span> 1140 </a></li><li class="share-reddit"><a rel="nofollow noopener noreferrer" 1141 data-shared="sharing-reddit-6149" 1142 class="share-reddit sd-button share-icon" 1143 href="https://castle-engine.io/wp/2026/07/14/windows-downloads-now-code-signed-no-more-smart-app-control-blocks-plus-smaller-downloads-7z-tar-xz/?share=reddit" 1144 target="_blank" 1145 aria-labelledby="sharing-reddit-6149" 1146 > 1147 <span id="sharing-reddit-6149" hidden>Share on Reddit (Opens in new window)</span> 1148 <span>Reddit</span> 1149 </a></li><li class="share-email"><a rel="nofollow noopener noreferrer" 1150 data-shared="sharing-email-6149" 1151 class="share-email sd-button share-icon" 1152 href="mailto:?subject=%5BShared%20Post%5D%20Windows%20downloads%20now%20code-signed%20-%20no%20more%20Smart%20App%20Control%20blocks.%20Plus%20smaller%20downloads%20%287z%2C%20tar.xz%29&body=https%3A%2F%2Fcastle-engine.io%2Fwp%2F2026%2F07%2F14%2Fwindows-downloads-now-code-signed-no-more-smart-app-control-blocks-plus-smaller-downloads-7z-tar-xz%2F&share=email" 1153 target="_blank" 1154 aria-labelledby="sharing-email-6149"
1155 data-email-share-error-title="Do you have email set up?" data-email-share-error-text="If you're having problems sharing via email, you might not have email set up for your browser. You may need to create a new email yourself." data-email-share-nonce="5bce8e8323" data-email-share-track-url="https://castle-engine.io/wp/2026/07/14/windows-downloads-now-code-signed-no-more-smart-app-control-blocks-plus-smaller-downloads-7z-tar-xz/?share=email"> 1156 <span id="sharing-email-6149" hidden>Email a link to a friend (Opens in new window)</span> 1157 <span>Email</span> 1158 </a></li><li class="share-end"></li></ul></div></div></div> </div><!-- .entry-content --> 1159 1160 1161 <a href="https://forum.castle-engine.io/t/windows-downloads-now-code-signed-no-more-smart-app-control-blocks-plus-smaller-downloads-7z-tar-xz/2183#comments">Comments on the forum ➤</a> 1162</article><!-- #post-## --> 1163 1164<article id="post-6137" class="post-6137 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized tag-castleengine tag-delphi tag-gamedev tag-linux tag-macos"> 1165 <header class="entry-header"> 1166 <p class="news_title_wrapper"><span class="h2 news_title"><a href="https://castle-engine.io/wp/2026/07/05/delphi-improvements-build-tool-uses-msbuild-allows-to-pick-delphi-version-better-generated-dproj-hints-to-fix-paserver-on-linux-and-linking-on-macos/" rel="bookmark">Delphi improvements: build tool uses msbuild, allows to pick Delphi version, better generated DPROJ, hints to fix PAServer on Linux and linking on macOS</a></span></p><p class="news_date_wrapper"><span class="news_date"><span class="screen-reader-text">Posted on</span> <a href="https://castle-engine.io/wp/2026/07/05/delphi-improvements-build-tool-uses-msbuild-allows-to-pick-delphi-version-better-generated-dproj-hints-to-fix-paserver-on-linux-and-linking-on-macos/" rel="bookmark"><time class="entry-date published updated" datetime="2026-07-05T05:57:10+00:00">July 5, 2026</time></a></span></p> </header><!-- .entry-header --> 1167 1168 <div class="entry-content"> 1169 <table class="thumbnails thumbnails-align-right"><tr><td> 1170 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/07/delphi_walking.png" 1171 class="screenshot" 1172 title="Delphi + Castle Game Engine"><img loading="lazy" decoding="async" 1173 style="float: right" 1174 src="https://castle-engine.io/wp/wp-content/uploads/2026/07/delphi_walking-200x107.png" 1175 width="200" height="107" 1176 alt="Delphi + Castle Game Engine" 1177 ></a></td></tr></table> 1178<p>We improved how our engine tools (<a href="https://castle-engine.io/build_tool">build tool</a> and <a href="https://castle-engine.io/editor">editor</a>) call Delphi. These improvements take us closer to <a href="https://castle-engine.io/delphi_more_platforms">making our engine compatible with Delphi for Android, iOS and macOS</a> and improve how you can build with Delphi from shell (e.g. from <em>Continuous Integration</em> workflows) for all platforms.</p> 1179<ol> 1180<li>First of all, our <a href="https://castle-engine.io/build_tool">build tool</a>, when using Delphi (pass <code>--compiler=delphi</code>), now calls <a href="https://docwiki.embarcadero.com/RADStudio/Sydney/en/Building_a_Project_Using_an_MSBuild_Command">msbuild</a> when you build for non-Windows. We do not directly call <code>dcc*</code> compilers. 1181<p>This makes building non-Windows applications with Delphi, using command-line, much easier. Notably, the command <code>castle-engine compile --compiler=delphi --os=linux</code> just works. See <a href="https://castle-engine.io/delphi_linux#_for_ci_continuous_integration_command_line_compilation_using_delphi_for_linux">using Delphi to build Linux applications</a>.</p> 1182<p>Note: pass <code>--verbose</code> to our build tool to see more details about what is executed. In effect, we pass options to <code>msbuild</code> to make it more verbose too. By default, <code>msbuild</code> output will be silent, unless Delphi will report some warnings/hints.</p> 1183<p>See our <a href="https://github.com/castle-engine/castle-engine/blob/master/tools/build-tool/delphi_dcc_vs_msbuild.md">dcc vs msbuild comparison</a> for more explanation.</p> 1184<p>We still fallback to using <code>dcc*</code></p> 1185<ul> 1186<li>if we cannot find DPROJ, </li> 1187<li>or if you pass <code>--use-delphi-dcc</code> option to the build tool,</li> 1188<li>or you build for Windows (because using <code>dcc</code> directly avoids the 32k command-line length problem, see <a href="https://github.com/castle-engine/castle-engine/blob/master/tools/build-tool/delphi_dcc_vs_msbuild.md">dcc vs msbuild comparison</a>). </li> 1189</ul> 1190<p><em>Note that this section of the post has been edited 1 day after publishing. We had to change our course. Initially, we tried to use <code>msbuild</code> also for Windows with Delphi > 10, but this was not good, we’ve been hit by the 32k command-line length problem also with Delphi 13.</em></p> 1191</li> 1192<li> 1193<p>Build tool allows to request specific Delphi version (instead of always calling the latest) using <code>--delphi-version</code> parameter. For example, to compile using Delphi 13, call</p> 1194<p></p><!-- Urvanov Syntax Highlighter v2.9.1 --> 1195
1196 <div id="urvanov-syntax-highlighter-6ab4e2a49b1c0756638906" class="urvanov-syntax-highlighter-syntax crayon-theme-monokai urvanov-syntax-highlighter-font-monospace urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; "> 1197 1198 <div class="urvanov-syntax-highlighter-plain-wrap"><textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; "> 1199castle-engine compile --delphi-version=37.0 --compiler=delphi</textarea></div> 1200 <div class="urvanov-syntax-highlighter-main" style=""> 1201 <table class="crayon-table"> 1202 <tr class="urvanov-syntax-highlighter-row"> 1203 <td class="crayon-nums " data-settings="show"> 1204 <div class="urvanov-syntax-highlighter-nums-content" style=""><div class="crayon-num" data-line="urvanov-syntax-highlighter-6ab4e2a49b1c0756638906-1">1</div></div> 1205 </td> 1206 <td class="urvanov-syntax-highlighter-code"><div class="crayon-pre" style=" -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><div class="crayon-line" id="urvanov-syntax-highlighter-6ab4e2a49b1c0756638906-1"><span class="crayon-v">castle</span><span class="crayon-o">-</span><span class="crayon-e">engine </span><span class="crayon-v">compile</span><span class="crayon-h"> </span>--<span class="crayon-v">delphi</span><span class="crayon-o">-</span><span class="crayon-v">version</span><span class="crayon-o">=</span><span class="crayon-cn">37.0</span><span class="crayon-h"> </span>--<span class="crayon-v">compiler</span><span class="crayon-o">=</span><span class="crayon-v">delphi</span></div></div></td> 1207 </tr> 1208 </table> 1209 </div> 1210 </div> 1211<!-- [Format Time: 0.0042 seconds] --> 1212<p></li> 1213<li>When generating DPROJ for your project, we no longer add absolute paths to engine units in DPROJ. 1214<p>We used to do this for a long time, knowing it’s not a good solution… time to remove this hack.</p> 1215<ul> 1216<li>The hack made DPROJ files, generated in the past, specific to given user on a given machine, since your DPROJ contained something like <code>C:\Users\Michalis\castle-engine\src\...</code> in search paths. This was not nice to put in a version control system or otherwise share with other developers/machines.</p> 1217</li> 1218<li> 1219<p>It also made DPROJ specific to a given CGE version, as we change engine paths between versions.</p> 1220</li> 1221</ul> 1222<p>New approach: We rely on:</p> 1223<ul> 1224<li>If you build from Delphi IDE: you must do <em>“Configure Delphi to Use Engine”</em>, following <a href="https://castle-engine.io/delphi_packages">Installing Delphi Packages</a> instructions.</p> 1225</li> 1226<li> 1227<p>If you build from our build tool or editor: we provide search paths to find the engine (in both <code>dcc</code> and <code>msbuild</code> approaches) automatically, on the command-line, in all cases. You don’t need to do anything.</p> 1228</li> 1229</ul> 1230</li> 1231<li> 1232<p>If you have issues with <a href="https://castle-engine.io/delphi_linux">Delphi+Linux</a> and PAServer due to <em>“too new Python on Linux”</em>, see <a href="https://castle-engine.io/delphi_linux#_installing_pa_server">here for solution</a>.</p> 1233<p>In short, you have to install older Python (<= 3.12). On Ubuntu it’s easiest to do using <a href="https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa">Python packages in PPA by “deadsnakes”</a>. Then make sure you symlink PAServer libraries to use that older Python.</p> 1234</li> 1235<li> 1236<p>Maybe you have problems building from Delphi 13 for <em>macOS/Aarch64 (Silicon)</em>? Then we have another tip:</p> 1237<ul> 1238<li>you must install the <a href="https://blogs.embarcadero.com/rad-studio-13-1-may-patch-available/">patch from Embarcadero</a> with the fix,</p> 1239</li> 1240<li> 1241<p>then hunt down the new PAServer version for macOS inside the folder like <code>C:\Users\<username>\Documents\Embarcadero\Studio\37.0\CatalogRepository\13.1Patch-May\1.0\PAServer</code> . It is <strong>not</strong> applied to your Delphi installation, <code>C:\Program Files (x86)\Embarcadero\Studio\37.0\PAServer</code> will still contain the broken version! It’
1241s not obvious as the <a href="https://blogs.embarcadero.com/rad-studio-13-1-may-patch-available/">patch docs merely say “This is copied to the patch download folder.”</a>.</p> 1242</li> 1243<li> 1244<p>Install the PAServer from <code>C:\Users\<username>\Documents\Embarcadero\Studio\37.0\CatalogRepository\13.1Patch-May\1.0\</code> on your macOS machine, and reimport macOS libraries (<em>“Options -> Deployment -> SDK Manager”</em>).</p> 1245</li> 1246</ul> 1247</li> 1248</ol> 1249<p>Thanks for reading and stay tuned for more Delphi news — we are working on something exciting 🙂 As always, we appreciate your support on <a href="https://www.patreon.com/cw/castleengine">Patreon</a>.</p> 1250<div class="sharedaddy sd-sharing-enabled"><div class="robots-nocontent sd-block sd-social sd-social-icon-text sd-sharing"><h3 class="sd-title">Share this:</h3><div class="sd-content"><ul><li class="share-bluesky"><a rel="nofollow noopener noreferrer" 1251 data-shared="sharing-bluesky-6137" 1252 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1310 data-email-share-error-title="Do you have email set up?" data-email-share-error-text="If you're having problems sharing via email, you might not have email set up for your browser. You may need to create a new email yourself." data-email-share-nonce="82a8944ea2" data-email-share-track-url="https://castle-engine.io/wp/2026/07/05/delphi-improvements-build-tool-uses-msbuild-allows-to-pick-delphi-version-better-generated-dproj-hints-to-fix-paserver-on-linux-and-linking-on-macos/?share=email"> 1311 <span id="sharing-email-6137" hidden>Email a link to a friend (Opens in new window)</span> 1312 <span>Email</span> 1313 </a></li><li class="share-end"></li></ul></div></div></div> </div><!-- .entry-content --> 1314 1315 1316 <a href="https://forum.castle-engine.io/t/delphi-improvements-build-tool-uses-msbuild-allows-to-pick-delphi-version-better-generated-dproj-hints-to-fix-paserver-on-linux-and-linking-on-macos/2179#comments">Comments on the forum ➤</a> 1317</article><!-- #post-## --> 1318 1319<article id="post-6124" class="post-6124 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized tag-ai tag-castleengine tag-claudecode tag-gamedev tag-pascal"> 1320 <header class="entry-header"> 1321 <p class="news_title_wrapper"><span class="h2 news_title"><a href="https://castle-engine.io/wp/2026/06/29/review-of-the-engine-by-claude-code-yielded-11-bug-fixes-the-good-the-bad-about-the-experience-how-you-can-do-this-in-your-own-codebase-docker-sbx-and-more/" rel="bookmark">Review of the engine by Claude Code yielded 11 bug-fixes. The good, the bad about the experience, how you can do this in your own codebase, Docker SBX and more</a></span></p><p class="news_date_wrapper"><span class="news_date"><span class="screen-reader-text">Posted on</span> <a href="https://castle-engine.io/wp/2026/06/29/review-of-the-engine-by-claude-code-yielded-11-bug-fixes-the-good-the-bad-about-the-experience-how-you-can-do-this-in-your-own-codebase-docker-sbx-and-more/" rel="bookmark"><time class="entry-date published updated" datetime="2026-06-29T22:17:41+00:00">June 29, 2026</time></a></span></p> </header><!-- .entry-header --> 1322 1323 <div class="entry-content"> 1324 <table class="thumbnails thumbnails-align-right"><tr><td> 1325 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/06/ply1.png" 1326 class="screenshot" 1327 title="PLY point cloud. with proper colors and opacity"><img loading="lazy" decoding="async" 1328 style="float: right" 1329 src="https://castle-engine.io/wp/wp-content/uploads/2026/06/ply1-200x124.png" 1330 width="200" height="124" 1331 alt="PLY point cloud. with proper colors and opacity" 1332 ></a></td></tr><tr><td> 1333 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/06/ply2.png" 1334 class="screenshot" 1335 title="PLY point cloud. with proper colors and opacity"><img loading="lazy" decoding="async" 1336 style="float: right" 1337 src="https://castle-engine.io/wp/wp-content/uploads/2026/06/ply2-200x124.png" 1338 width="200" height="124" 1339 alt="PLY point cloud. with proper colors and opacity" 1340 ></a></td></tr><tr><td> 1341 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/06/ply3.png" 1342 class="screenshot" 1343 title="PLY point cloud. with proper colors and opacity"><img loading="lazy" decoding="async" 1344 style="float: right" 1345 src="https://castle-engine.io/wp/wp-content/uploads/2026/06/ply3-200x124.png" 1346 width="200" height="124" 1347 alt="PLY point cloud. with proper colors and opacity" 1348 ></a></td></tr></table> 1349<p>I gave <em>Claude</em> a long-running task: Review <em>every</em> file of <em>Castle Game Engine</em>.</p> 1350<p>The process found 11 “real” bugs (something was indeed a bug in the engine, and it could be a bug in real-life applications using the engine) which we promptly fixed. So I’m happy:) See the <em>“Detailed Stats”</em> section at the end for all the numbers.</p> 1351<p>I will describe the process below, to give some pointers how to do it on your own codebase
1351s. In short: fine-tune the instructions to get quality reviews, watch for agent trying to avoid doing real reviews, use <em>Docker SBX</em> to run securely unattended.</p> 1352<p><em>Note: If you want to know my general thoughts/experience about using AI with Castle Game Engine, see <a href="https://castle-engine.io/ai">AI guidelines for Castle Game Engine</a>. A short version: let’s work to gain understanding / be smarter thanks to AI, and not to lose understanding / be dumber.</em> AI can do impressive stuff, but can also be terribly unreliable — in fact the post below is another good example of both of those facts being true <em>at the same time</em>.</p> 1353<p>For some independent AI opinion that I agree with, see <a href="https://castle-engine.io/ai#_see_also">links at the bottom of our guidelines</a>, and also I recently read <a href="https://mariozechner.at/posts/2026-03-25-thoughts-on-slowing-the-fuck-down/">from a creator of open-source AI harness Pi “Thoughts on slowing the fuck down”</a>.</p> 1354<h2>Motivation: AI reviews (subset of them) are useful</h2> 1355<ol> 1356<li>AI reviews of commits/PRs by Claude are useful in my experience. Using commands like <code>review staged</code>, <code>review unstaged</code>, <code>review unmerged</code> is consistently giving me useful suggestions how to improve the code before I push it. 1357<p>I have to emphasize that by <strong>useful</strong> I mean that <strong>they contain useful bits</strong>. Of course they are also filled with nonsense — AI misunderstanding what the application/engine around it does, misunderstanding differences between FPC/Delphi or particular platforms, suggesting bad approaches (always with confidence), suggesting “defensive” coding techniques that would actually hide problems instead of keeping the flow validated…</p> 1358<p>But if you’re prepared + capable of filtering out the nonsense, you’re left with useful observations how to improve the code. AI reviews do sometimes note a real improvement or even real bug-fix that my own eyes didn’t catch — that’s why I use it. It’s a special case of <a href="https://en.wikipedia.org/wiki/Linus%27s_law">“many eyeballs make all the bugs shallow” rule</a>, here AI is another set of eyeballs.</p> 1359<p>( This of course also deserves a disclaimer: Don’t write bad quality code just because you can rely that “AI review” will smooth it out. It will <em>not</em>, it will not capture all the wrong edge-cases if your design is flawed, it will not do the thinking for you. Use AI as a helper, not as replacement for your own thinking/understanding. )</p> 1360</li> 1361<li> 1362<p>So, why am I using AI reviews only for new code that I commit? Let’s review all the past code!</p> 1363</li> 1364<li> 1365<p>A bonus note about security, especially if you develop an application where security is a concern (you consume untrusted input, from network or game MODs — see <a href="https://github.com/castle-engine/castle-engine/blob/master/SECURITY.md">how this applies to games / game engines too</a>): this approach could be focused to perform a “security audit”.</p> 1366<p>You don’t need <em>Mythos</em> to do it:) And, to be serious, the bad actors <em>will do such review of your code</em>, esp. if you’re open-source and your code is just public. So you better do the audit yourself, and fix the issues before they are exploited.</p> 1367</li> 1368</ol> 1369<h2>How I did this: on tuning the reviews quality/verbosity and Docker sbx</h2> 1370<p>The details how I set this up (so that you can consider doing this for your own codebase too):</p> 1371<ol> 1372<li><strong>Initial prompt.</strong> At the start, I asked to review the engine, file by file, starting from <code>src/</code> and provide a review for each file. 1373<p>Note: <a href="https://github.com/castle-engine/castle-engine/blob/master/CLAUDE.md">Our engine already includes CLAUDE.md</a> to help Claude follow our rules better. If you don’t have such file, I would recommend to create and maintain it — it really helps to “steer” Claude in a good direction. To make it available to non-Claude agents, use <a href="https://code.claude.com/docs/en/memory#agents-md">AGENTS.md and point to it from CLAUDE.md</a>.</p> 1374</li> 1375<li> 1376<p><strong>Fine-tune to get useful reviews.</strong> It took some fine-tuning to make the initial prompt really useful.</p> 1377<p>At the beginning, it tended to produce overly-verbose and useless reviews — often discussing with itself (like <em>“Bug! X does Y. Oh, no wait, it is actually OK. Not a bug”</em>.) or pointing to not important details (to give it credit, it sometimes flagged such notes as <em>nit-picking</em> indeed).</p> 1378<p>Instructing it to give more concise reports… resulted in getting simple review <em>“No definite bugs found.”</em> for all engine files:) Well that’s also useless, of course.</p> 1379<p>In the end, we found a middle ground, although effectively I cannot share with you <em>“just a single prompt to do this”</em>, because the end result is a conversation and pointing into examples what to do / what not to do. For some files, I got “No bugs.”, for some others I got txt files with 1-2 issues to correct.</p> 1380<p>The point is: you need to look at initial reviews, and consider if they are too verbose/succinct, and give feedback to steer it in the useful direction. Otherwise browsing a 4000 sloppy reviews will be a huge pointless job for you.</p> 1381</li> 1382<li> 1383<p><strong>It was worth it!</strong> The issues detected (<em>after</em> the fine-tuning above) are genuinely useful reports. Real, meaty bugs that I missed over the years. E.g.</p> 1384<ul> 1385<li><a href="https://github.com/castle-engine/castle-engine/commit/6378c47f433fd414867634198aa0e3a3b5567e4d">Our fallback from <em>OpenGLES 3</em> to <em>OpenGLES 2</em>
1385 (important to support older mobile devices) was broken.</a></p> 1386</li> 1387<li> 1388<p><a href="https://github.com/castle-engine/castle-engine/commit/17b9567e45df565efc0fd0dafe317e2cb51d4c97">Loading non-mono sounds on the web was broken.</a></p> 1389</li> 1390<li> 1391<p><a href="https://github.com/castle-engine/castle-engine/commit/4dc54e7a249d1aa161065c78f8052681c1fbcd57">FMOD priority was passed inverted (we marked the most important sounds -> as the least important)</a></p> 1392</li> 1393<li> 1394<p>Genuine bugs, that could affect real applications! So I’m really happy I did this. Later section of this post <em>“Detailed Stats”</em> contains all the links.</p> 1395</li> 1396<li> 1397<p>It also reported a few minors – typos in documentation, and things <em>“potentially buggy, but not really possible in real-life usage”</em>. But after the above fine-tuning, this wasn’t a terrible flood of noise, and I’m happy to fix the genuine typos too.</p> 1398</li> 1399</ul> 1400</li> 1401<li> 1402<p><strong>Fixing them manually or not?</strong> Initially I considered letting Claude also fix the issues by itself.</p> 1403<ul> 1404<li>But in the end, I fixed most of them manually (i.e. I’m still using AI code completion through <em>GitHub Copilot</em>, but not AI agent) since the AI agent “fixes” mostly required fixes on top of them. It didn’t add automated tests, it didn’t make code clean (centralizing logic). Reviewing + fixing agent work was taking me longer than “just doing” them in the way I want from start.</p> 1405</li> 1406<li> 1407<p>And some reviews were plain wrong. E.g. it wanted to break <code>TCastleTouchControl</code> by limiting speed, because it wanted to adapt visual clamping to speed clamping — without understanding that the current version is actually what we want, more functional to use.</p> 1408</li> 1409</ul> 1410</li> 1411<li> 1412<p><strong>Place reviews in <code>.ai-review</code> subdirs.</strong> I started by instructing Claude to show me the review, and only continue once I acknowledge. This was of course not good in the long-run, it needlessly blocked the work, so I switched to <em>“put each review in a txt file alongside the source, and don’t wait for my confirmation to move on”</em>.</p> 1413<p>In the end I switched to <em>“put each review in a <code>.ai-review</code> subdirectory, e.g. review for <code>src/foo.pas</code> goes to <code>src/.ai-review/foo.txt</code>“</em>.</p> 1414<p>This allowed me to easily ignore these reviews in version control, by adding <code>.ai-review/</code> to GIT exclusions (e.g. in <code>.git/info/exclude</code>, so the exclusions themselves remain private to me).</p> 1415</li> 1416<li> 1417<p><strong>Exclude auto-generated and 3rd party stuff.</strong> I fine-tuned which files to include / exclude. I did want to go through <em>entire</em> engine (sources, examples, tools etc.). But I excluded auto-generated files (like LPK, DPROJ, auto-generated per-node includes in <code>src/scene/x3d/auto_generated_node_helpers/</code>) and 3rd-party units code (like <em>Vampyre Imaging</em>).</p> 1418</li> 1419<li> 1420<p><strong>Watch it, as it tries to abort / avoid doing the work!</strong> I needed to push Claude to actually do all the reviews, unattended. I used <code>/goal</code> to enforce it, and it worked… only to some extent.</p> 1421<p>Claude started to avoid work by doing “shallow” reviews of most files — and happily reported “No bugs found” for ~1000 files while admitting it only scanned them. (grepped for potential issues, not read). I instructed to use “deep review”, and again enforced it using <code>/goal</code>.</p> 1422<p>Then Claude lied to me that it “finished the work” while it turned out it only processed 3 sub-directories in <code>src</code> and the rest was quickly scanned. Not surprisingly, the “scanned sub-directories” did not contain any issues according to the review. This is hilariously unreliable:) I just kept looking what it’s doing and asking for the “deep review” when I saw it tries to mass-qualify a bunch of files as <em>“No bugs found”</em>.</p> 1423</li> 1424<li> 1425<p><strong>This used multiple 4h sessions.</strong> This was a very long-running task. Multiple times I exhausted my “tokens in 4h window” limit from Claude Code. I was ready and OK for this, I just waited, and later/next day said “continue”.</p> 1426</li> 1427<li> 1428<p><strong>Docker SBX rocks for unattended agent usage.</strong> I wanted it to run without interaction, since otherwise I’m a human bottleneck and I mostly just accept the commands executed. (some of the commands could not be auto-accepted by a useful pattern.)</p> 1429<p>So I wanted to run with <code>--dangerously-skip-permissions</code>, but that’s something you should never do without being in a secure container. ( Really, don’t ignore this warning. Esp. for longer-running tasks where you don’t observe everything the AI is doing. Letting it run with <code>--dangerously-skip-permissions</code> will lead to a disaster!, weird things will happen <em>
1429at least in your repo</em> (and maybe beyond) and you will not even know what/why happened. )</p> 1430<p>Solution: I run the session of Claude inside <a href="https://docs.docker.com/reference/cli/sbx/">Docker’s sbx</a> which is a fantastic tool to run AI agents in a sandbox. Docker containers are obvious solution for isolation of agents, and <code>sbx</code> makes using them for this specific purpose a breeze. It creates containers with read-write mount on your disk, so you can inspect the work (and even commit+push) comfortably on your host system, while AI runs in a really isolated environment.</p> 1431<p>I highly recommend this approach for any longer-running AI tasks. It’s really a relief to just run inside <code>sbx</code> with <code>--dangerously-skip-permissions</code>, so you’re no longer a dummy clicking <em>“yes I allow”</em> (and constantly break your work to look at Claude state) and you can just let it run. You don’t specifically need <code>sbx</code> for this, since any virtualization Docker-like solution could achieve this — but I found <code>sbx</code> to just fit me right out-of-the-box, and I already use Docker for other stuff so this felt “I’m at home” for me.</p> 1432</li> 1433<li> 1434<p><strong>Moving conversations from outside to inside SBX.</strong> As I didn’t start with the <code>sbx</code> approach, I started with a normal session outside <code>sbx</code> -> so then resumed work in a session inside <code>sbx</code>. I wondered about copying around <code>~/.claude</code> to make this resume smooth, but in the end it was enough to carry the “current review state” in a collection of Markdown files, and just point the new session to them, and also copy a bunch of “memory files”.</p> 1435</li> 1436</ol> 1437<p>All in all, I do recommend this process, I guess, to everyone if you have some “tokens to spare”. As pointed above — the process <strong>had flaws</strong>, you need to fine-tune the verbosity/quality of the reviews, you need to make sure it’s really doing it (and not lying to you). But it also had real gains — real, user-affecting bugs have been found and fixed in the engine thanks to this.</p> 1438<h2>Detailed stats</h2> 1439<p>If you’re curious, detailed stats and links to what was fixed:</p> 1440<ul> 1441<li>11 bugs I would classify as important (real bugs, affecting potential real use-cases): 1442<ol> 1443<li><a href="https://github.com/castle-engine/castle-engine/commit/6378c47f433fd414867634198aa0e3a3b5567e4d">GLES 3->2 fallback</a></p> 1444</li> 1445<li> 1446<p><a href="https://github.com/castle-engine/castle-engine/commit/17b9567e45df565efc0fd0dafe317e2cb51d4c97">stereo WAV files for WebAudio backen</a></p> 1447</li> 1448<li> 1449<p><a href="https://github.com/castle-engine/castle-engine/commit/4dc54e7a249d1aa161065c78f8052681c1fbcd57">FMOD priority inverted</a></p> 1450</li> 1451<li> 1452<p><a href="https://github.com/castle-engine/castle-engine/commit/bc92a9a8f466796c9f1570d9546740d26ddf6ef6">S3TC vertical flip for some heights</a></p> 1453</li> 1454<li> 1455<p><a href="https://github.com/castle-engine/castle-engine/commit/06c97f1c7716dd7f77047c6c42efdc8e52dd780a">SaveScreen on TCastleControl ignored SaveRect</a></p> 1456</li> 1457<li> 1458<p><a href="https://github.com/castle-engine/castle-engine/commit/4d642c2d48f18edc786a14e06d824037a9bc0f24">3D images with TransformRGB, ModulateRGB</a></p> 1459</li> 1460<li> 1461<p><a href="https://github.com/castle-engine/castle-engine/commit/bad52d05885146798fd47b8d7e8550e2d5b573b7">secure shell quoting for Delphi+Linux OpenUrl / OpenDocument; note that we later removed this in favor of new <code>ExecuteCommand</code> logic</a></p> 1462</li> 1463<li> 1464<p><a href="https://github.com/castle-engine/castle-engine/commit/9ae829f6429b523d48a8bef28f904febb94cfa83">TCastleFontFamily with Size=0 but Outline<>0 was buggy</a></p> 1465</li> 1466<li> 1467<p><a href="https://github.com/castle-engine/castle-engine/commit/39cbe3ae70ed9440af907c0580b6bd71e4a00a4c">mismatched parameter types, float vs double, in C header files vs Pascal implementation</a></p> 1468</li> 1469<li> 1470<p><a href="https://github.com/castle-engine/castle-engine/commit/93203f879e670d4da84ad9b6511a4592f497b1f8">slightly wrong, washed out, PLY colors</a></p> 1471</li> 1472<li> 1473<p><a href="https://github.com/castle-engine/castle-engine/commit/8d21832f20b5aec962930eecffa7ab4cd8797864">wrong <code>opacity</code> interpretation in PLY files</a></p> 1474</li> 1475</ol> 1476</li> 1477<li> 1478<p>8 very minor bugs (unlikely this affected any real use-case, but yeah, the bug is real):</p> 1479<ol> 1480<li><a href="https://github.com/castle-engine/castle-engine/commit/9617891a4cefd47c3e0e05c4fcc021a8ef69f8bd">FitWithin, TSprite</a></p> 1481</li> 1482<li> 1483<p><a href="https://github.com/castle-engine/castle-engine/commit/f8036cc45726aaf2fd1d19052df91c4950176a11">more</a></p> 1484</li> 1485<li> 1486<p><a href="https://github.com/castle-engine/castle-engine/commit/44c46b99cf58f2f81d0fc85382122f784a18b445">more</a></p> 1487</li> 1488<li> 1489<p><a href="https://github.com/castle-engine/castle-engine/commit/cba640bfb60bd2d7487e2119abbf35c97b15a9c5">more</a></p> 1490</li> 1491<li> 1492<p><a href="https://github.com/castle-engine/castle-engine/commit/d90e0ccd422888a692f17971e9c41f16250ee414">more</a></p> 1493</li> 1494<li> 1495<p><a href="https://github.com/castle-engine/castle-engine/commit/40a9c07b0bc2ef3ff4051e65109693a41bdee878">more</a></p> 1496</li> 1497<li> 1498<p><a href="https://github.com/castle-engine/castle-engine/commit/678f325d145e032888bb85fb6941816e85a54108">more</a></p> 1499</li> 1500<li> 1501<p><a href="https://github.com/castle-engine/castle-engine/commit/85139371bef114828e16956c69908b5e5c665a3d">CastleScript’s <code>image_load</code> never returned <code>TGrayscale[Alpha]Image</code></a></p> 1502</li> 1503</ol> 1504</li> 1505<li> 1506<p>2 very minor memory leaks (unlikely to affect any real usage):</p> 1507<ul> 1508<li><a href="https://github.com/castle-engine/castle-engine/commit/9617891a4cefd47c3e0e05c4fcc021a8ef69f8bd">this is a subset of this commit</a></li> 1509</ul> 1510</li> 1511<li>Few minors – error messages improvements, obvious comments/typo fixes: 1512<ul> 1513<li><a href="https://github.com/castle-engine/castle-engine/commit/6b065fc58016bd096896d46ff45bb2802c24f933">here</a></p> 1514</li> 1515<li> 1516<p><a href="https://github.com/castle-engine/castle-engine/commit/a5b311aae88385dceeb25b49c76b18898264c642">here</a></p> 1517</li> 1518<li> 1519<p>and <a href="https://github.com/castle-engine/castle-engine/commit/bb4233e6fb12105a14bd7a5fd7dca6cab13a971e">here</a>.</p> 1520</li> 1521</ul> 1522</li> 1523</ul> 1524<p>And that’s it 🙂 Thank you for reading.</p> 1525<p>If you like what we’re doing, please <a href="https://www.patreon.com/c/castleengine">support the engine development</a>
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1586 data-email-share-error-title="Do you have email set up?" data-email-share-error-text="If you're having problems sharing via email, you might not have email set up for your browser. You may need to create a new email yourself." data-email-share-nonce="a95980554f" data-email-share-track-url="https://castle-engine.io/wp/2026/06/29/review-of-the-engine-by-claude-code-yielded-11-bug-fixes-the-good-the-bad-about-the-experience-how-you-can-do-this-in-your-own-codebase-docker-sbx-and-more/?share=email"> 1587 <span id="sharing-email-6124" hidden>Email a link to a friend (Opens in new window)</span> 1588 <span>Email</span> 1589 </a></li><li class="share-end"></li></ul></div></div></div> </div><!-- .entry-content --> 1590 1591 1592 <a href="https://forum.castle-engine.io/t/review-of-the-engine-by-claude-code-yielded-11-bug-fixes-the-good-the-bad-about-the-experience-how-you-can-do-this-in-your-own-codebase-docker-sbx-and-more/2174#comments">Comments on the forum ➤</a> 1593</article><!-- #post-## --> 1594 1595<article id="post-6117" class="post-6117 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized tag-castleengine tag-delphi tag-gamedev tag-pascal tag-windows"> 1596 <header class="entry-header"> 1597 <p class="news_title_wrapper"><span class="h2 news_title"><a href="https://castle-engine.io/wp/2026/06/28/tcastleprocess-and-executecommand-available-with-both-fpc-and-delphi-no-more-cryptic-failed-to-execute-4551-when-windows-smart-app-control-blocks-us/" rel="bookmark">TCastleProcess and ExecuteCommand available with both FPC and Delphi, no more cryptic “Failed to execute  : 4551” when Windows “Smart App Control” blocks us</a></span></p><p class="news_date_wrapper"><span class="news_date"><span class="screen-reader-text">Posted on</span> <a href="https://castle-engine.io/wp/2026/06/28/tcastleprocess-and-executecommand-available-with-both-fpc-and-delphi-no-more-cryptic-failed-to-execute-4551-when-windows-smart-app-control-blocks-us/" rel="bookmark"><time class="entry-date published updated" datetime="2026-06-28T04:58:42+00:00">June 28, 2026</time></a></span></p> </header><!-- .entry-header --> 1598 1599 <div class="entry-content"> 1600 <table class="thumbnails thumbnails-align-right"><tr><td> 1601 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/06/walking_adventure_processes.png" 1602 class="screenshot" 1603 title="Editor executing compiler and game - this is one process calling another"><img loading="lazy" decoding="async" 1604 style="float: right" 1605 src="https://castle-engine.io/wp/wp-content/uploads/2026/06/walking_adventure_processes-200x112.png" 1606 width="200" height="112" 1607 alt="Editor executing compiler and game - this is one process calling another" 1608 ></a></td></tr><tr><td> 1609 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/06/smart_app_control_1.png" 1610 class="screenshot" 1611 title="Effect when &quot;Smart App Control&quot; blocks us"><img loading="lazy" decoding="async" 1612 style="float: right" 1613 src="https://castle-engine.io/wp/wp-content/uploads/2026/06/smart_app_control_1-200x148.png" 1614 width="200" height="148" 1615 alt="Effect when &quot;Smart App Control&quot; blocks us" 1616 ></a></td></tr><tr><td> 1617 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/06/smart_app_control_2.png" 1618 class="screenshot" 1619 title="Effect when &quot;Smart App Control&quot; blocks us"><img loading="lazy" decoding="async" 1620 style="float: right" 1621 src="https://castle-engine.io/wp/wp-content/uploads/2026/06/smart_app_control_2-200x153.png" 1622 width="200" height="153" 1623 alt="Effect when &quot;Smart App Control&quot; blocks us" 1624 ></a></td></tr></table> 1625<p>We refactored our process running code (when one application wants to run another). This is used throughout our tools (<a href="https://castle-engine.io/build_tool">build tool</a>, <a href="https://castle-engine.io/editor">editor</a>) but we also have uses for it in the engine itself. Refactoring this into a nice unit gives us more possibilities, for now and for the future:)</p> 1626<ol> 1627<li>The code is now in a nice unit <code>CastleInternalProcess</code> available throughout the engine, with <code>TCastleProcess</code> class and our routines like <code>ExecuteCommand</code>, <code>ExecuteCommandCapture</code>. 1628<ul> 1629<li>As the name suggests, we still consider this an <em>internal</em> unit, so if you decide to use it in your own applications -> you risk that we break API.</p> 1630</li> 1631<li> 1632<p>That said, there’s no hiding that the unit is useful right now, with FPC+Delphi capability to run processes. Let us know how do you use it, and maybe we’ll just rename it to <code>CastleProcess</code> at some point.</p> 1633</li> 1634<li> 1635<p>Since this is internal now, the API docs are not generated by PasDoc, but you can just <a href="https://github.com/castle-engine/castle-engine/blob/master/src/files/castleinternalprocess.pas">read the source code</a> for the docs in comments.</p> 1636</li> 1637</ul> 1638</li> 1639<li> 1640<p>The code is simpler and better organized than previous code in build tool / editor. Some of the old internal
1640code had “historical baggage” (e.g. how is environment overridden for the child process) which was cleaned up now.</p> 1641</li> 1642<li> 1643<p>Since all usage now goes through <code>TCastleProcess</code>, we can reliably make a better error message when execution on Windows is blocked by <em>“Smart App Control”</em>. FPC Process was showing cryptic <em>“Failed to execute  : 4551”</em> message in this case. This is quite important — as this message is killing our usage on Windows now!</p> 1644<ul> 1645<li>Note that <a href="https://www.reddit.com/r/Windows11/comments/1s2t50a/comment/ochifwy/">this Reddit comment with cited Microsoft documentation</a> tells the simple version of what happens: “Smart App Control” checks if the application is “known”, and if not -> checks does it have a valid signature. As that comment says: <em>“it effectively just prevents you running any programs that don’t have a digital signature”</em>.</p> 1646</li> 1647<li> 1648<p>Proper codesigning is coming ASAP too. I see that with <em>“Smart App Control”</em>, right now our experience on Windows is really bad. We have started our <a href="https://castle-engine.io/wp/2025/12/30/december-news-unlimited-skin-joints-on-shaders-pointproperties-and-plans-for-2026-next-release-signpath-better-macos-silicon-shadow-maps/">SignPath process</a>, I need to finish it.</p> 1649</li> 1650</ul> 1651</li> 1652<li> 1653<p><code>TCastleProcess</code> and helpers are now implemented also for Delphi (for Windows, Linux, macOS/Intel, macOS/Aarch64).</p> 1654<ul> 1655<li>This also opens the door to have e.g. our <a href="https://castle-engine.io/build_tool">build tool</a> compile-able with Delphi in the future. It’s not a high-priority goal (it is an engine tool, you should not need to recompile it yourself), but it aligns with our goal “support Delphi as good as FPC”. On more practical grounds, compiling code with Delphi is always a useful “extra check” of the code correctness.</li> 1656</ul> 1657</li> 1658<li>We feature helpers like: 1659<ul> 1660<li> 1661<p><code>ExecuteCommand</code> – wait for the executed process to finish, don’t capture anything, return status.</p> 1662</li> 1663<li> 1664<p><code>ExecuteCommandCheckStatus</code> – wait for the executed process to finish, don’t capture anything, raise exception if non-zero status.</p> 1665</li> 1666<li> 1667<p><code>ExecuteCommandCapture</code> – wait for the executed process to finish, capture stdout/stderr to string. This one is for now still FPC-only.</p> 1668</li> 1669</ul> 1670</li> 1671<li> 1672<p><code><a href="https://castle-engine.io/apidoc/html/CastleOpenDocument.html#OpenDocument-String-">OpenDocument</a></code>, <code><a href="https://castle-engine.io/apidoc/html/CastleOpenDocument.html#OpenUrl-String-">OpenUrl</a></code> on Unix are simpler now — they just use <code>TCastleProcess</code> through a simple <code>ExecuteCommandNoWait</code>, with both compilers.</p> 1673</li> 1674</ol> 1675<div class="sharedaddy sd-sharing-enabled"><div class="robots-nocontent sd-block sd-social sd-social-icon-text sd-sharing"><h3 class="sd-title">Share this:</h3><div class="sd-content"><ul><li class="share-bluesky"><a rel="nofollow noopener noreferrer" 1676 data-shared="sharing-bluesky-6117" 1677 class="share-bluesky sd-button share-icon" 1678 href="https://castle-engine.io/wp/2026/06/28/tcastleprocess-and-executecommand-available-with-both-fpc-and-delphi-no-more-cryptic-failed-to-execute-4551-when-windows-smart-app-control-blocks-us/?share=bluesky" 1679 target="_blank" 1680 aria-labelledby="sharing-bluesky-6117" 1681 > 1682 <span id="sharing-bluesky-6117" hidden>Share on Bluesky (Opens in new window)</span> 1683 <span>Bluesky</span> 1684 </a></li><li class="share-mastodon"><a rel="nofollow noopener noreferrer" 1685 data-shared="sharing-mastodon-6117" 1686 class="share-mastodon sd-button share-icon" 1687 href="https://castle-engine.io/wp/2026/06/28/tcastleprocess-and-executecommand-available-with-both-fpc-and-delphi-no-more-cryptic-failed-to-execute-4551-when-windows-smart-app-control-blocks-us/?share=mastodon" 1688 target="_blank" 1689 aria-labelledby="sharing-mastodon-6117" 1690 > 1691 <span id="sharing-mastodon-6117" hidden>Share on Mastodon (Opens in new window)</span> 1692 <span>Mastodon</span> 1693 </a></li><li class="share-facebook"><a rel="nofollow noopener noreferrer" 1694 data-shared="sharing-facebook-6117" 1695 class="share-facebook sd-button share-icon" 1696 href="https://castle-engine.io/wp/2026/06/28/tcastleprocess-and-executecommand-available-with-both-fpc-and-delphi-no-more-cryptic-failed-to-execute-4551-when-windows-smart-app-control-blocks-us/?share=facebook" 1697 target="_blank" 1698 aria-labelledby="sharing-facebook-6117" 1699 > 1700 <span id="sharing-facebook-6117" hidden>Share on Facebook (Opens in new window)</span> 1701 <span>Facebook</span> 1702 </a></li><li class="share-threads"><a rel="nofollow noopener noreferrer" 1703 data-shared="sharing-threads-6117" 1704 class="share-threads sd-button share-icon" 1705 href="https://castle-engine.io/wp/2026/06/28/tcastleprocess-and-executecommand-available-with-both-fpc-and-delphi-no-more-cryptic-failed-to-execute-4551-when-windows-smart-app-control-blocks-us/?share=threads" 1706 target="_blank" 1707 aria-labelledby="sharing-threads-6117" 1708 > 1709 <span id="sharing-threads-6117" hidden>Share on Threads (Opens in new window)</span> 1710 <span>Threads</span> 1711 </a></li><li class="share-linkedin"><a rel="nofollow noopener noreferrer" 1712 data-shared="sharing-linkedin-6117" 1713 class="share-linkedin sd-button share-icon" 1714 href="https://castle-engine.io/wp/2026/06/28/tcastleprocess-and-executecommand-available-with-both-fpc-and-delphi-no-more-cryptic-failed-to-execute-4551-when-windows-smart-app-control-blocks-us/?share=linkedin" 1715 target="_blank" 1716 aria-labelledby="sharing-linkedin-6117" 1717 > 1718 <span id="sharing-linkedin-6117" hidden>Share on LinkedIn (Opens in new window)</span> 1719 <span>LinkedIn</span> 1720 </a></li><li class="share-reddit"><a rel="nofollow noopener noreferrer" 1721 data-shared="sharing-reddit-6117" 1722 class="share-reddit sd-button share-icon" 1723 href="https://castle-engine.io/wp/2026/06/28/tcastleprocess-and-executecommand-available-with-both-fpc-and-delphi-no-more-cryptic-failed-to-execute-4551-when-windows-smart-app-control-blocks-us/?share=reddit" 1724 target="_blank" 1725 aria-labelledby="sharing-reddit-6117" 1726 > 1727 <span id="sharing-reddit-6117" hidden>Share on Reddit (Opens in new window)</span> 1728 <span>Reddit</span> 1729 </a></li><li class="share-email"><a rel="nofollow noopener noreferrer" 1730 data-shared="sharing-email-6117" 1731 class="share-email sd-button share-icon" 1732 href="mailto:?subject=%5BShared%20Post%5D%20TCastleProcess%20and%20ExecuteCommand%20available%2
17320with%20both%20FPC%20and%20Delphi%2C%20no%20more%20cryptic%20%22Failed%20to%20execute%20%C2%A0%3A%204551%22%20when%20Windows%20%22Smart%20App%20Control%22%20blocks%20us&body=https%3A%2F%2Fcastle-engine.io%2Fwp%2F2026%2F06%2F28%2Ftcastleprocess-and-executecommand-available-with-both-fpc-and-delphi-no-more-cryptic-failed-to-execute-4551-when-windows-smart-app-control-blocks-us%2F&share=email" 1733 target="_blank" 1734 aria-labelledby="sharing-email-6117" 1735 data-email-share-error-title="Do you have email set up?" data-email-share-error-text="If you're having problems sharing via email, you might not have email set up for your browser. You may need to create a new email yourself." data-email-share-nonce="b2f8d60fe2" data-email-share-track-url="https://castle-engine.io/wp/2026/06/28/tcastleprocess-and-executecommand-available-with-both-fpc-and-delphi-no-more-cryptic-failed-to-execute-4551-when-windows-smart-app-control-blocks-us/?share=email"> 1736 <span id="sharing-email-6117" hidden>Email a link to a friend (Opens in new window)</span> 1737 <span>Email</span> 1738 </a></li><li class="share-end"></li></ul></div></div></div> </div><!-- .entry-content --> 1739 1740 1741 <a href="https://forum.castle-engine.io/t/tcastleprocess-and-executecommand-available-with-both-fpc-and-delphi-no-more-cryptic-failed-to-execute-4551-when-windows-smart-app-control-blocks-us/2169#comments">Comments on the forum ➤</a> 1742</article><!-- #post-## --> 1743 1744<article id="post-6093" class="post-6093 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized tag-audio tag-castleengine tag-gamedev tag-pascal tag-skinnedanimation"> 1745 <header class="entry-header"> 1746 <p class="news_title_wrapper"><span class="h2 news_title"><a href="https://castle-engine.io/wp/2026/06/05/music-player-example-application-important-fixes-around-audio-and-skinned-animation/" rel="bookmark">Music Player example application, important fixes around audio and skinned animation</a></span></p><p class="news_date_wrapper"><span class="news_date"><span class="screen-reader-text">Posted on</span> <a href="https://castle-engine.io/wp/2026/06/05/music-player-example-application-important-fixes-around-audio-and-skinned-animation/" rel="bookmark"><time class="entry-date published updated" datetime="2026-06-05T21:22:31+00:00">June 5, 2026</time></a></span></p> </header><!-- .entry-header --> 1747 1748 <div class="entry-content"> 1749 <table class="thumbnails thumbnails-align-right"><tr><td> 1750 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/06/screenshot2.png" 1751 class="screenshot" 1752 title="Music Player using Castle Game Engine"><img loading="lazy" decoding="async" 1753 style="float: right" 1754 src="https://castle-engine.io/wp/wp-content/uploads/2026/06/screenshot2-200x362.png" 1755 width="200" height="362" 1756 alt="Music Player using Castle Game Engine" 1757 ></a></td></tr><tr><td> 1758 <a href="https://castle-engine.io/wp/wp-content/uploads/2026/06/screenshot.png" 1759 class="screenshot" 1760 title="Music Player using Castle Game Engine"><img loading="lazy" decoding="async" 1761 style="float: right" 1762 src="https://castle-engine.io/wp/wp-content/uploads/2026/06/screenshot-200x362.png" 1763 width="200" height="362" 1764 alt="Music Player using Castle Game Engine" 1765 ></a></td></tr></table> 1766<ol> 1767<li>We have a new example: <a href="https://github.com/castle-engine/castle-engine/tree/master/examples/audio/music_collection_player">Music Player</a>, a simple application that allows to play a chosen audio track with UI similar to typical mobile music/audiobook players. 1768<p>This example has a nice backstory: For <em>Mother’s Day</em> (which is 26th May in Poland) my daughter and I made a gift for The Wife: a private application (Android apk) with a few audio tracks just for her. There’s an audio track with my daughter signing, with our cat meowing and other gems:)</p> 1769<p>Don’t worry, the version I committed as our <em>Castle Game Engine</em> demo has more mainstream sounds :), using open-source audio tracks from <a href="http://Ope
1769nGameArt.org">OpenGameArt.org</a>. Big thanks go to <a href="https://cynicmusic.com/">The Cynic Project</a> (see also <a href="https://pixelsphere.org/">Pixelsphere</a> project) for the cool public domain music tracks! See the <a href="https://github.com/castle-engine/castle-engine/blob/master/examples/audio/music_collection_player/data/songs/AUTHORS.md">credits</a> for details about audio and art authors.</p> 1770<p>Have fun extending this into your own ideas and I hope this inspires you to have fun with our engine:)</p> 1771<p>Try out the example <a href="https://castle-engine.io/web-demos/examples/audio/music_collection_player/">playing on the web</a> right now! Though it looks best in <em>portrait</em> aspect, like on mobile.</p> 1772<p>In a bit related news, please <a href="https://keepandroidopen.org/">sign and spread the word about the need to keep Android open</a>. Sadly, Google plans to practically break this important aspect of Android, which will prohibit making such fun experiments like “family Android app” and endanger more important use-cases (like distributing VPN apps in countries with totalitarian regimes).</p> 1773</li> 1774<li> 1775<p>We have a few important audio fixes in the engine (thanks to experience with above example, but also a review done by Claude — more on this in a future news post):</p> 1776<ul> 1777<li><code><a href="https://castle-engine.io/apidoc/html/CastleSoundEngine.TCastlePlayingSound.html#Offset">TCastlePlayingSound.Offset</a></code> for streaming sounds is now correctly read, and when trying to set it we make a clear warning that this is not supported. Please uncheck <code><a href="https://castle-engine.io/apidoc/html/CastleSoundEngine.TCastleSound.html#Stream">TCastleSound.Stream</a></code> if you want to change audio track offset at runtime. (Before this fix, both getting and setting offset was broken, without any warning.) This applies only to the <a href="https://castle-engine.io/openal">OpenAL</a> sound backend, which is default on most platforms.</p> 1778</li> 1779<li> 1780<p>Loading stereo (or other non-mono) WAV sounds on the <a href="https://castle-engine.io/web">web</a> has been fixed.</p> 1781</li> 1782<li> 1783<p>
1783Priority of sounds was mistakenly inverted when using <a href="https://castle-engine.io/fmod">FMOD</a> (we marked “most important sounds” as “least important” by accident), fixed now.</p> 1784</li> 1785</ul> 1786</li> 1787<li> 1788<p>We have fixed loading <em>float</em> textures on OpenGLES (Android, iOS). This makes our <a href="https://castle-engine.io/skin">optimized skinned animation</a> work in an optimal way on your phones.</p> 1789</li> 1790<li> 1791<p>We made important glTF skinned animation fix (affecting all platforms): multiple skins that affect the same skeleton are now supported (if equivalent) or at least cleanly tolerated (we make a clear warning, and render part of the model as static).</p> 1792<p>E.g. these <a href="https://opengameart.org/content/mini-character-1">Mini Characters from Kenney</a> were broken, now they are fixed. See <a href="https://forum.castle-engine.io/t/cge-doesnt-load-process-some-glb-models/2158">the forum thread for gory details what was broken and how it was fixed</a>.</p> 1793</li> 1794</ol> 1795<p>As always, we hope you have fun developing games and we appreciate <a href="https://www.patreon.com/c/castleengine">your support on Patreon</a>. Thank you!</p> 1796<div class="sharedaddy sd-sharing-enabled"><div class="robots-nocontent sd-block sd-social sd-social-icon-text sd-sharing"><h3 class="sd-title">Share this:</h3><div class="sd-content"><ul><li class="share-bluesky"><a rel="nofollow noopener noreferrer" 1797 data-shared="sharing-bluesky-6093" 1798 class="share-bluesky sd-button share-icon" 1799 href="https://castle-engine.io/wp/2026/06/05/music-player-example-application-important-fixes-around-audio-and-skinned-animation/?share=bluesky" 1800 target="_blank" 1801 aria-labelledby="sharing-bluesky-6093" 1802 > 1803 <span id="sharing-bluesky-6093" hidden>Share on Bluesky (Opens in new window)</span> 1804 <span>Bluesky</span> 1805 </a></li><li class="share-mastodon"><a rel="nofollow noopener noreferrer" 1806 data-shared="sharing-mastodon-6093" 1807 class="share-mastodon sd-button share-icon" 1808 href="https://castle-engine.io/wp/2026/06/05/music-player-example-application-important-fixes-around-audio-and-skinned-animation/?share=mastodon" 1809 target="_blank" 1810 aria-labelledby="sharing-mastodon-6093" 1811 > 1812 <span id="sharing-mastodon-6093" hidden>Share on Mastodon (Opens in new window)</span> 1813 <span>Mastodon</span> 1814 </a></li><li class="share-facebook"><a rel="nofollow noopener noreferrer" 1815 data-shared="sharing-facebook-6093" 1816 class="share-facebook sd-button share-icon" 1817 href="https://castle-engine.io/wp/2026/06/05/music-player-example-application-important-fixes-around-audio-and-skinned-animation/?share=facebook" 1818 target="_blank" 1819 aria-labelledby="sharing-facebook-6093" 1820 > 1821 <span id="sharing-facebook-6093" hidden>Share on Facebook (Opens in new window)</span> 1822 <span>Facebook</span> 1823 </a></li><li class="share-threads"><a rel="nofollow noopener noreferrer" 1824 data-shared="sharing-threads-6093" 1825 class="share-threads sd-button share-icon" 1826 href="https://castle-engine.io/wp/2026/06/05/music-player-example-application-important-fixes-around-audio-and-skinned-animation/?share=threads" 1827 target="_blank" 1828 aria-labelledby="sharing-threads-6093" 1829 > 1830 <span id="sharing-threads-6093" hidden>Share on Threads (Opens in new window)</span> 1831 <span>Threads</span> 1832 </a></li><li class="share-linkedin"><a rel="nofollow noopener noreferrer" 1833 data-shared="sharing-linkedin-6093" 1834 class="share-linkedin sd-button share-icon" 1835 href="https://castle-engine.io/wp/2026/06/05/music-player-example-application-important-fixes-around-audio-and-skinned-animation/?share=linkedin" 1836 target="_blank" 1837 aria-labelledby="sharing-linkedin-6093" 1838 > 1839 <span id="sharing-linkedin-6093" hidden>Share on LinkedIn (Opens in new window)</span> 1840 <span>LinkedIn</span> 1841 </a></li><li class="share-reddit"><a rel="nofollow noopener noreferrer" 1842 data-shared="sharing-reddit-6093" 1843 class="share-reddit sd-button share-icon" 1844 href="https://castle-engine.io/wp/2026/06/05/music-player-example-application-important-fixes-around-audio-and-skinned-animation/?share=reddit" 1845 target="_blank" 1846 aria-labelledby="sharing-reddit-6093" 1847 > 1848 <span id="sharing-reddit-6093" hidden>Share on Reddit (Opens in new window)</span> 1849 <span>Reddit</span> 1850 </a></li><li class="share-email"><a rel="nofollow noopener noreferrer" 1851 data-shared="sharing-email-6093" 1852 class="share-email sd-button share-icon" 1853 href="mailto:?subject=%5BShared%20Post%5D%20Music%20Player%20example%20application%2C%20important%20fixes%20around%20audio%20and%20skinned%20animation&body=https%3A%2F%2Fcastle-engine.io%2Fwp%2F2026%2F06%2F05%2Fmusic-player-example-application-important-fixes-around-audio-and-skinned-animation%2F&share=email" 1854 target="_blank" 1855 aria-labelledby="sharing-email-6093"
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2173 2174 2175<!-- Using passive event listeners can improve scrolling performance, according to 2176 https://web.dev/uses-passive-event-listeners/ 2177 (linked from Lighthouse). 2178 Solution for jQuery from 2179 https://stackoverflow.com/questions/60357083/does-not-use-passive-listeners-to-improve-scrolling-performance-lighthouse-repo 2180 2181 This must be really right after jquery.min.js, in castle-engine.js it would be too late. 2182-->
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2208<script> 2209 jQuery('a.screenshot').colorbox({opacity: 0.9, rel:'screenshot', maxWidth:'90%', maxHeight:'90%'}); 2210 // For AsciiDoctor images with role=screenshot 2211 jQuery('.screenshot a').colorbox({opacity: 0.9, rel:'screenshot', maxWidth:'90%', maxHeight:'90%'}); 2212</script>
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