WebGLRenderer: Traverse only visible lights in compile()

This way the set of lights matches with the ones used during rendering, making sure that the compiled programs have the right parameters for rendering.

src/renderers/WebGLRenderer.js

@@ -873,9 +873,9 @@ function WebGLRenderer( parameters ) {
 		currentRenderState = renderStates.get( scene, camera );
 		currentRenderState.init();
 
-		scene.traverse( function ( object ) {
+		scene.traverseVisible( function ( object ) {
 
-			if ( object.isLight ) {
+			if ( object.isLight && object.layers.test( camera.layers ) ) {
 
 				currentRenderState.pushLight( object );