https://netsheipasam.com/wp-content/plugins/3dprint/includes/ext/threejs/js/Mirror.js?ver=3.6.1.6

1/**
2 * @author Slayvin / http://slayvin.net
3 */
4
5THREE3DP.ShaderLib[ 'mirror' ] = {
6
7	uniforms: {
8		"mirrorColor": { value: new THREE3DP.Color( 0x7F7F7F ) },
9		"mirrorSampler": { value: null },
10		"textureMatrix" : { value: new THREE3DP.Matrix4() }
11	},
12
13	vertexShader: [
14
15		"uniform mat4 textureMatrix;",
16
17		"varying vec4 mirrorCoord;",
18
19		"void main() {",
20
21			"vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );",
22			"vec4 worldPosition = modelMatrix * vec4( position, 1.0 );",
23			"mirrorCoord = textureMatrix * worldPosition;",
24
25			"gl_Position = projectionMatrix * mvPosition;",
26
27		"}"
28
29	].join( "\n" ),
30
31	fragmentShader: [
32
33		"uniform vec3 mirrorColor;",
34		"uniform sampler2D mirrorSampler;",
35
36		"varying vec4 mirrorCoord;",
37
38		"float blendOverlay(float base, float blend) {",
39			"return( base < 0.5 ? ( 2.0 * base * blend ) : (1.0 - 2.0 * ( 1.0 - base ) * ( 1.0 - blend ) ) );",
40		"}",
41
42		"void main() {",
43
44			"vec4 color = texture2DProj(mirrorSampler, mirrorCoord);",
45			"color = vec4(blendOverlay(mirrorColor.r, color.r), blendOverlay(mirrorColor.g, color.g), blendOverlay(mirrorColor.b, color.b), 1.0);",
46
47			"gl_FragColor = color;",
48
49		"}"
50
51	].join( "\n" )
52
53};
54
55THREE3DP.Mirror = function ( renderer, camera, options ) {
56
57	THREE3DP.Object3D.call( this );
58
59	this.name = 'mirror_' + this.id;
60
61	options = options || {};
62
63	this.matrixNeedsUpdate = true;
64
65	var width = options.textureWidth !== undefined ? options.textureWidth : 512;
66	var height = options.textureHeight !== undefined ? options.textureHeight : 512;
67
68	this.clipBias = options.clipBias !== undefined ? options.clipBias : 0.0;
69
70	var mirrorColor = options.color !== undefined ? new THREE3DP.Color( options.color ) : new THREE3DP.Color( 0x7F7F7F );
71
72	this.renderer = renderer;
73	this.mirrorPlane = new THREE3DP.Plane();
74	this.normal = new THREE3DP.Vector3( 0, 0, 1 );
75	this.mirrorWorldPosition = new THREE3DP.Vector3();
76	this.cameraWorldPosition = new THREE3DP.Vector3();
77	this.rotationMatrix = new THREE3DP.Matrix4();
78	this.lookAtPosition = new THREE3DP.Vector3( 0, 0, - 1 );
79	this.clipPlane = new THREE3DP.Vector4();
80
81	// For debug only, show the normal and plane of the mirror
82	var debugMode = options.debugMode !== undefined ? options.debugMode : false;
83
84	if ( debugMode ) {
85
86		var arrow = new THREE3DP.ArrowHelper( new THREE3DP.Vector3( 0, 0, 1 ), new THREE3DP.Vector3( 0, 0, 0 ), 10, 0xffff80 );
87		var planeGeometry = new THREE3DP.Geometry();
88		planeGeometry.vertices.push( new THREE3DP.Vector3( - 10, - 10, 0 ) );
89		planeGeometry.vertices.push( new THREE3DP.Vector3( 10, - 10, 0 ) );
90		planeGeometry.vertices.push( new THREE3DP.Vector3( 10, 10, 0 ) );
91		planeGeometry.vertices.push( new THREE3DP.Vector3( - 10, 10, 0 ) );
92		planeGeometry.vertices.push( planeGeometry.vertices[ 0 ] );
93		var plane = new THREE3DP.Line( planeGeometry, new THREE3DP.LineBasicMaterial( { color: 0xffff80 } ) );
94
95		this.add( arrow );
96		this.add( plane );
97
98	}
99
100	if ( camera instanceof THREE3DP.PerspectiveCamera ) {
101
102		this.camera = camera;
103
104	} else {
105
106		this.camera = new THREE3DP.PerspectiveCamera();
107		console.log( this.name + ': camera is not a Perspective Camera!' );
108
109	}
110
111	this.textureMatrix = new THREE3DP.Matrix4();
112
113	this.mirrorCamera = this.camera.clone();
114	this.mirrorCamera.matrixAutoUpdate = true;
115
116	var parameters = { minFilter: THREE3DP.LinearFilter, magFilter: THREE3DP.LinearFilter, format: THREE3DP.RGBFormat, stencilBuffer: false };
117
118	this.renderTarget = new THREE3DP.WebGLRenderTarget( width, height, parameters );
119	this.renderTarget2 = new THREE3DP.WebGLRenderTarget( width, height, parameters );
120
121	var mirrorShader = THREE3DP.ShaderLib[ "mirror" ];
122	var mirrorUniforms = THREE3DP.UniformsUtils.clone( mirrorShader.uniforms );
123
124	this.material = new THREE3DP.ShaderMaterial( {
125
126		fragmentShader: mirrorShader.fragmentShader,
127		vertexShader: mirrorShader.vertexShader,
128		uniforms: mirrorUniforms
129
130	} );
131
132	this.material.uniforms.mirrorSampler.value = this.renderTarget.texture;
133	this.material.uniforms.mirrorColor.value = mirrorColor;
134	this.material.uniforms.textureMatrix.value = this.textureMatrix;
135
136	if ( ! THREE3DP.Math.isPowerOfTwo( width ) || ! THREE3DP.Math.isPowerOfTwo( height ) ) {
137
138		this.renderTarget.texture.generateMipmaps = false;
139		this.renderTarget2.texture.generateMipmaps = false;
140
141	}
142
143	this.updateTextureMatrix();
144	this.render();
145
146};
147
148THREE3DP.Mirror.prototype = Object.create( THREE3DP.Object3D.prototype );
149THREE3DP.Mirror.prototype.constructor = THREE3DP.Mirror;
150
151THREE3DP.Mirror.prototype.renderWithMirror = function ( otherMirror ) {
152
153	// update the mirror matrix to mirror the current view
154	this.updateTextureMatrix();
155	this.matrixNeedsUpdate = false;
156
157	// set the camera of the other mirror so the mirrored view is the reference view
158	var tempCamera = otherMirror.camera;
159	otherMirror.camera = this.mirrorCamera;
160
161	// render the other mirror in temp texture
162	otherMirror.renderTemp();
163	otherMirror.material.uniforms.mirrorSampler.value = otherMirror.renderTarget2.texture;
164
165	// render the current mirror
166	this.render();
167	this.matrixNeedsUpdate = true;
168
169	// restore material and camera of other mirror
170	otherMirror.material.uniforms.mirrorSampler.value = otherMirror.renderTarget.texture;
171	otherMirror.camera = tempCamera;
172
173	// restore texture matrix of other mirror
174	otherMirror.updateTextureMatrix();
175
176};
177
178THREE3DP.Mirror.prototype.updateTextureMatrix = function () {
179
180	this.updateMatrixWorld();
181	this.camera.updateMatrixWorld();
182
183	this.mirrorWorldPosition.setFromMatrixPosition( this.matrixWorld );
184	this.cameraWorldPosition.setFromMatrixPosition( this.camera.matrixWorld );
185
186	this.rotationMatrix.extractRotation( this.matrixWorld );
187
188	this.normal.set( 0, 0, 1 );

189	this.normal.applyMatrix4( this.rotationMatrix );
190
191	var view = this.mirrorWorldPosition.clone().sub( this.cameraWorldPosition );
192	view.reflect( this.normal ).negate();
193	view.add( this.mirrorWorldPosition );
194
195	this.rotationMatrix.extractRotation( this.camera.matrixWorld );
196
197	this.lookAtPosition.set( 0, 0, - 1 );
198	this.lookAtPosition.applyMatrix4( this.rotationMatrix );
199	this.lookAtPosition.add( this.cameraWorldPosition );
200
201	var target = this.mirrorWorldPosition.clone().sub( this.lookAtPosition );
202	target.reflect( this.normal ).negate();
203	target.add( this.mirrorWorldPosition );
204
205	this.up.set( 0, - 1, 0 );
206	this.up.applyMatrix4( this.rotationMatrix );
207	this.up.reflect( this.normal ).negate();
208
209	this.mirrorCamera.position.copy( view );
210	this.mirrorCamera.up = this.up;
211	this.mirrorCamera.lookAt( target );
212
213	this.mirrorCamera.updateProjectionMatrix();
214	this.mirrorCamera.updateMatrixWorld();
215	this.mirrorCamera.matrixWorldInverse.getInverse( this.mirrorCamera.matrixWorld );
216
217	// Update the texture matrix
218	this.textureMatrix.set( 0.5, 0.0, 0.0, 0.5,
219							0.0, 0.5, 0.0, 0.5,
220							0.0, 0.0, 0.5, 0.5,
221							0.0, 0.0, 0.0, 1.0 );
222	this.textureMatrix.multiply( this.mirrorCamera.projectionMatrix );
223	this.textureMatrix.multiply( this.mirrorCamera.matrixWorldInverse );
224
225	// Now update projection matrix with new clip plane, implementing code from: http://www.terathon.com/code/oblique.html
226	// Paper explaining this technique: http://www.terathon.com/lengyel/Lengyel-Oblique.pdf
227	this.mirrorPlane.setFromNormalAndCoplanarPoint( this.normal, this.mirrorWorldPosition );
228	this.mirrorPlane.applyMatrix4( this.mirrorCamera.matrixWorldInverse );
229
230	this.clipPlane.set( this.mirrorPlane.normal.x, this.mirrorPlane.normal.y, this.mirrorPlane.normal.z, this.mirrorPlane.constant );
231
232	var q = new THREE3DP.Vector4();
233	var projectionMatrix = this.mirrorCamera.projectionMatrix;
234
235	q.x = ( Math.sign( this.clipPlane.x ) + projectionMatrix.elements[ 8 ] ) / projectionMatrix.elements[ 0 ];
236	q.y = ( Math.sign( this.clipPlane.y ) + projectionMatrix.elements[ 9 ] ) / projectionMatrix.elements[ 5 ];
237	q.z = - 1.0;
238	q.w = ( 1.0 + projectionMatrix.elements[ 10 ] ) / projectionMatrix.elements[ 14 ];
239
240	// Calculate the scaled plane vector
241	var c = new THREE3DP.Vector4();
242	c = this.clipPlane.multiplyScalar( 2.0 / this.clipPlane.dot( q ) );
243
244	// Replacing the third row of the projection matrix
245	projectionMatrix.elements[ 2 ] = c.x;
246	projectionMatrix.elements[ 6 ] = c.y;
247	projectionMatrix.elements[ 10 ] = c.z + 1.0 - this.clipBias;
248	projectionMatrix.elements[ 14 ] = c.w;
249
250};
251
252THREE3DP.Mirror.prototype.render = function () {
253
254	if ( this.matrixNeedsUpdate ) this.updateTextureMatrix();
255
256	this.matrixNeedsUpdate = true;
257
258	// Render the mirrored view of the current scene into the target texture
259	var scene = this;
260
261	while ( scene.parent !== null ) {
262
263		scene = scene.parent;
264
265	}
266
267	if ( scene !== undefined && scene instanceof THREE3DP.Scene ) {
268
269		// We can't render ourself to ourself
270		var visible = this.material.visible;
271		this.material.visible = false;
272
273		this.renderer.render( scene, this.mirrorCamera, this.renderTarget, true );
274
275		this.material.visible = visible;
276
277	}
278
279};
280
281THREE3DP.Mirror.prototype.renderTemp = function () {
282
283	if ( this.matrixNeedsUpdate ) this.updateTextureMatrix();
284
285	this.matrixNeedsUpdate = true;
286
287	// Render the mirrored view of the current scene into the target texture
288	var scene = this;
289
290	while ( scene.parent !== null ) {
291
292		scene = scene.parent;
293
294	}
295
296	if ( scene !== undefined && scene instanceof THREE3DP.Scene ) {
297
298		this.renderer.render( scene, this.mirrorCamera, this.renderTarget2, true );
299
300	}
301
302};