Hello, I created a scene (with blender) composed of cubes and a map (plan). I checked "enable collisions" for all my objects and only put a mass to my cubes. But I have a problem in blender I can't choose "mesh" for my plan to export otherwise it create me an error, so I have to export it as a box. But in box mode, if my cube is outside the map (the map is pierced in the middle), the cube stops falling anyway because I chose the box mode. I read that there was a notion of precision, but I did not find in blender. Thank you for your help. I work with blender 1.68a and Babylon.js 1.10. An example to my problem: https://dl.dropboxusercontent.com/u/48211107/babylonjsBlender.rar