Clean up

examples/webgl_materials_physical_transmission.html

@@ -96,7 +96,6 @@
 					alphaMap: texture,
 					envMap: hdrCubeRenderTarget.texture,
 					envMapIntensity: params.envMapIntensity,
-					depthWrite: false,
 					transmission: params.transmission, // use material.transmission for glass materials
 					opacity: params.opacity,
 					side: THREE.DoubleSide,