Fix for retina displays

examples/canvas_interactive_voxelpainter.html

@@ -141,8 +141,8 @@
 
 				event.preventDefault();
 
-				mouse.x = ( event.clientX / renderer.domElement.width ) * 2 - 1;
-				mouse.y = - ( event.clientY / renderer.domElement.height ) * 2 + 1;
+				mouse.x = ( event.clientX / renderer.domElement.clientWidth ) * 2 - 1;
+				mouse.y = - ( event.clientY / renderer.domElement.clientHeight ) * 2 + 1;
 
 				raycaster.setFromCamera( mouse, camera );