https://github.com/WWBN/AVideo/issues/8713

node_modules/three/examples/js/objects/Reflector.js

@@ -0,0 +1,240 @@
+THREE.Reflector = function ( geometry, options ) {
+
+	THREE.Mesh.call( this, geometry );
+
+	this.type = 'Reflector';
+
+	var scope = this;
+
+	options = options || {};
+
+	var color = ( options.color !== undefined ) ? new THREE.Color( options.color ) : new THREE.Color( 0x7F7F7F );
+	var textureWidth = options.textureWidth || 512;
+	var textureHeight = options.textureHeight || 512;
+	var clipBias = options.clipBias || 0;
+	var shader = options.shader || THREE.Reflector.ReflectorShader;
+
+	//
+
+	var reflectorPlane = new THREE.Plane();
+	var normal = new THREE.Vector3();
+	var reflectorWorldPosition = new THREE.Vector3();
+	var cameraWorldPosition = new THREE.Vector3();
+	var rotationMatrix = new THREE.Matrix4();
+	var lookAtPosition = new THREE.Vector3( 0, 0, - 1 );
+	var clipPlane = new THREE.Vector4();
+
+	var view = new THREE.Vector3();
+	var target = new THREE.Vector3();
+	var q = new THREE.Vector4();
+
+	var textureMatrix = new THREE.Matrix4();
+	var virtualCamera = new THREE.PerspectiveCamera();
+
+	var parameters = {
+		minFilter: THREE.LinearFilter,
+		magFilter: THREE.LinearFilter,
+		format: THREE.RGBFormat
+	};
+
+	var renderTarget = new THREE.WebGLRenderTarget( textureWidth, textureHeight, parameters );
+
+	if ( ! THREE.MathUtils.isPowerOfTwo( textureWidth ) || ! THREE.MathUtils.isPowerOfTwo( textureHeight ) ) {
+
+		renderTarget.texture.generateMipmaps = false;
+
+	}
+
+	var material = new THREE.ShaderMaterial( {
+		uniforms: THREE.UniformsUtils.clone( shader.uniforms ),
+		fragmentShader: shader.fragmentShader,
+		vertexShader: shader.vertexShader
+	} );
+
+	material.uniforms[ 'tDiffuse' ].value = renderTarget.texture;
+	material.uniforms[ 'color' ].value = color;
+	material.uniforms[ 'textureMatrix' ].value = textureMatrix;
+
+	this.material = material;
+
+	this.onBeforeRender = function ( renderer, scene, camera ) {
+
+		reflectorWorldPosition.setFromMatrixPosition( scope.matrixWorld );
+		cameraWorldPosition.setFromMatrixPosition( camera.matrixWorld );
+
+		rotationMatrix.extractRotation( scope.matrixWorld );
+
+		normal.set( 0, 0, 1 );
+		normal.applyMatrix4( rotationMatrix );
+
+		view.subVectors( reflectorWorldPosition, cameraWorldPosition );
+
+		// Avoid rendering when reflector is facing away
+
+		if ( view.dot( normal ) > 0 ) return;
+
+		view.reflect( normal ).negate();
+		view.add( reflectorWorldPosition );
+
+		rotationMatrix.extractRotation( camera.matrixWorld );
+
+		lookAtPosition.set( 0, 0, - 1 );
+		lookAtPosition.applyMatrix4( rotationMatrix );
+		lookAtPosition.add( cameraWorldPosition );
+
+		target.subVectors( reflectorWorldPosition, lookAtPosition );
+		target.reflect( normal ).negate();
+		target.add( reflectorWorldPosition );
+
+		virtualCamera.position.copy( view );
+		virtualCamera.up.set( 0, 1, 0 );
+		virtualCamera.up.applyMatrix4( rotationMatrix );
+		virtualCamera.up.reflect( normal );
+		virtualCamera.lookAt( target );
+
+		virtualCamera.far = camera.far; // Used in WebGLBackground
+
+		virtualCamera.updateMatrixWorld();
+		virtualCamera.projectionMatrix.copy( camera.projectionMatrix );
+
+		// Update the texture matrix
+		textureMatrix.set(
+			0.5, 0.0, 0.0, 0.5,
+			0.0, 0.5, 0.0, 0.5,
+			0.0, 0.0, 0.5, 0.5,
+			0.0, 0.0, 0.0, 1.0
+		);
+		textureMatrix.multiply( virtualCamera.projectionMatrix );
+		textureMatrix.multiply( virtualCamera.matrixWorldInverse );
+		textureMatrix.multiply( scope.matrixWorld );
+
+		// Now update projection matrix with new clip plane, implementing code from: http://www.terathon.com/code/oblique.html
+		// Paper explaining this technique: http://www.terathon.com/lengyel/Lengyel-Oblique.pdf
+		reflectorPlane.setFromNormalAndCoplanarPoint( normal, reflectorWorldPosition );
+		reflectorPlane.applyMatrix4( virtualCamera.matrixWorldInverse );
+
+		clipPlane.set( reflectorPlane.normal.x, reflectorPlane.normal.y, reflectorPlane.normal.z, reflectorPlane.constant );
+
+		var projectionMatrix = virtualCamera.projectionMatrix;
+
+		q.x = ( Math.sign( clipPlane.x ) + projectionMatrix.elements[ 8 ] ) / projectionMatrix.elements[ 0 ];
+		q.y = ( Math.sign( clipPlane.y ) + projectionMatrix.elements[ 9 ] ) / projectionMatrix.elements[ 5 ];
+		q.z = - 1.0;
+		q.w = ( 1.0 + projectionMatrix.elements[ 10 ] ) / projectionMatrix.elements[ 14 ];
+
+		// Calculate the scaled plane vector
+		clipPlane.multiplyScalar( 2.0 / clipPlane.dot( q ) );
+
+		// Replacing the third row of the projection matrix
+		projectionMatrix.elements[ 2 ] = clipPlane.x;
+		projectionMatrix.elements[ 6 ] = clipPlane.y;
+		projectionMatrix.elements[ 10 ] = clipPlane.z + 1.0 - clipBias;
+		projectionMatrix.elements[ 14 ] = clipPlane.w;
+
+		// Render
+
+		renderTarget.texture.encoding = renderer.outputEncoding;
+
+		scope.visible = false;
+
+		var currentRenderTarget = renderer.getRenderTarget();
+
+		var currentXrEnabled = renderer.xr.enabled;
+		var currentShadowAutoUpdate = renderer.shadowMap.autoUpdate;
+
+		renderer.xr.enabled = false; // Avoid camera modification
+		renderer.shadowMap.autoUpdate = false; // Avoid re-computing shadows
+
+		renderer.setRenderTarget( renderTarget );
+
+		renderer.state.buffers.depth.setMask( true ); // make sure the depth buffer is writable so it can be properly cleared, see #18897
+
+		if ( renderer.autoClear === false ) renderer.clear();
+		renderer.render( scene, virtualCamera );
+
+		renderer.xr.enabled = currentXrEnabled;
+		renderer.shadowMap.autoUpdate = currentShadowAutoUpdate;
+
+		renderer.setRenderTarget( currentRenderTarget );
+
+		// Restore viewport
+
+		var viewport = camera.viewport;
+
+		if ( viewport !== undefined ) {
+
+			renderer.state.viewport( viewport );
+
+		}
+
+		scope.visible = true;
+
+	};
+
+	this.getRenderTarget = function () {
+
+		return renderTarget;
+
+	};
+
+};
+
+THREE.Reflector.prototype = Object.create( THREE.Mesh.prototype );
+THREE.Reflector.prototype.constructor = THREE.Reflector;
+
+THREE.Reflector.ReflectorShader = {
+
+	uniforms: {
+
+		'color': {
+			value: null
+		},
+
+		'tDiffuse': {
+			value: null
+		},
+
+		'textureMatrix': {
+			value: null
+		}
+
+	},
+
+	vertexShader: [
+		'uniform mat4 textureMatrix;',
+		'varying vec4 vUv;',
+
+		'void main() {',
+
+		'	vUv = textureMatrix * vec4( position, 1.0 );',
+
+		'	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
+
+		'}'
+	].join( '\n' ),
+
+	fragmentShader: [
+		'uniform vec3 color;',
+		'uniform sampler2D tDiffuse;',
+		'varying vec4 vUv;',
+
+		'float blendOverlay( float base, float blend ) {',
+
+		'	return( base < 0.5 ? ( 2.0 * base * blend ) : ( 1.0 - 2.0 * ( 1.0 - base ) * ( 1.0 - blend ) ) );',
+
+		'}',
+
+		'vec3 blendOverlay( vec3 base, vec3 blend ) {',
+
+		'	return vec3( blendOverlay( base.r, blend.r ), blendOverlay( base.g, blend.g ), blendOverlay( base.b, blend.b ) );',
+
+		'}',
+
+		'void main() {',
+
+		'	vec4 base = texture2DProj( tDiffuse, vUv );',
+		'	gl_FragColor = vec4( blendOverlay( base.rgb, color ), 1.0 );',
+
+		'}'
+	].join( '\n' )
+};