Refactored postprocessing out of examples into own set of classes.

Not sure yet about names and location of files.

examples/js/postprocessing/ScreenPass.js

@@ -0,0 +1,34 @@
+/**
+ * @author alteredq / http://alteredqualia.com/
+ */
+
+THREE.ScreenPass = function( opacity ) {
+
+	var shader = THREE.ShaderUtils.lib[ "screen" ];
+
+	this.uniforms = THREE.UniformsUtils.clone( shader.uniforms );
+	this.uniforms[ "opacity" ].value = ( opacity !== undefined ) ? opacity : 1.0;
+
+	this.material = new THREE.MeshShaderMaterial( {
+
+		uniforms: this.uniforms,
+		vertexShader: shader.vertexShader,
+		fragmentShader: shader.fragmentShader
+
+	} );
+
+};
+
+THREE.ScreenPass.prototype = {
+
+	render: function ( renderer, renderTarget, delta ) {
+
+		this.uniforms[ "tDiffuse" ].texture = renderTarget;
+
+		THREE.EffectComposer.quad.materials[ 0 ] = this.material;
+
+		renderer.render( THREE.EffectComposer.scene, THREE.EffectComposer.camera );
+
+	}
+
+};