Hi,   While working with ArcRotateCamera, the camera just passes through the box, instead of stopping, when it collides with a mesh (as mentioned here: https://github.com/BabylonJS/Babylon.js/wiki/09-Cameras-and-mesh-collisions#arcrotatecamera).   Here's the example: http://www.babylonjs-playground.com/#4HUQQ#39   If its FreeCamera, it just slides, but this is not working with ArcRotateCamera. Am I missing something or is this how ArcRotateCamera works?