Clean up.

examples/webgl_materials_transparency.html

@@ -75,13 +75,11 @@
 				var geometry = new THREE.SphereGeometry( 18, 30, 30 );
 
 				var material1 = new THREE.MeshStandardMaterial( {
-					roughness: params.roughness,
 					opacity: params.opacity,
 					transparent: true
 				} );
 
 				var material2 = new THREE.MeshStandardMaterial( {
-					roughness: params.roughness,
 					opacity: params.opacity,
 					premultipliedAlpha: true,
 					transparent: true