////////////////////////////////////////////////////////////////////////////
	//		blend main scene with glow.renderTexture			//
	//////////////////////////////////////////////////////////////////////////////////

	var composer	= new THREE.EffectComposer(renderer)
	// add Render Pass
	var effect	= new THREE.RenderPass(scene, camera)
	composer.addPass( effect )

	// experiment to have only one renderPass
	// add Render Pass
	// var effect	= new THREE.ShaderPass(THREE.CopyShader)
	// effect.uniforms['tDiffuse'