text: //// From http://threejs.org/examples/js/shaders/RGBShiftShader.js
  /**
   * @author felixturner / http://airtight.cc/
   *
   * RGB Shift Shader
   * Shifts red and blue channels from center in opposite directions
   * Ported from http://kriss.cx/tom/2009/05/rgb-shift/
   * by Tom Butterworth / http://kriss.cx/tom/
   *
   * amount: shift distance (1 is width of input)
   * angle: shift angle in radians
   */
  
  THREE.RGBShiftShader = {
  
  	uniforms: {
  
  		"tDiffuse": { value: null },
  		"amount":   { value: 0.005 },
  		"angle":    { value: 0.0 }
  
  	},
  
  	vertexShader: [
  
  		"varying vec2 vUv;",
  
  		"void main() {",
  
  			"vUv = uv;",
  			"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
  
  		"}"
  
  	].join( "\n" ),
  
  	fragmentShader: [
  
  		"uniform sampler2D tDiffuse;",
  		"uniform float amount;",
  		"uniform float angle;",
  
  		"varying vec2 vUv;",
  
  		"void main() {",
  
  			"vec2 offset = amount * vec2( cos(angle), sin(angle));",
  			"vec4 cr = texture2D(tDiffuse, vUv + offset);",
  			"vec4 cga = texture2D(tDiffuse, vUv);",
  			"vec4 cb = texture2D(tDiffuse, vUv - offset);",
  			"gl_FragColor = vec4(cr.r, cga.g, cb.b, cga.a);",
  
  		"}"
  
  	].join( "\n" )
  
  };
  