text: 
  THREE.CopyShader = {
  
  	uniforms: {
  
  		"tDiffuse": { type: "t", value: null },
  		"opacity":  { type: "f", value: 1.0 }
  
  	},
  
  	vertexShader: [
  
  		"varying vec2 vUv;",
  
  		"void main() {",
  
  			"vUv = uv;",
  			"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
  
  		"}"
  
  	].join("\n"),
  
  	fragmentShader: [
  
  		"uniform float opacity;",
  
  		"uniform sampler2D tDiffuse;",
  
  		"varying vec2 vUv;",
  
  		"void main() {",
  
  			"vec4 texel = texture2D( tDiffuse, vUv );",
  			"gl_FragColor = opacity * texel;",
  
  		"}"
  
  	].join("\n")
  
  };
  