# moveWithCollisions boxes overlap

**URL:** <https://forum.babylonjs.com/t/movewithcollisions-boxes-overlap/35520>\
**Category:** Questions\
**Created:** [November 8, 2022, 7:08pm UTC](https://forum.babylonjs.com/t/movewithcollisions-boxes-overlap/35520 "2022-11-08T19:08:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![z0y1](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/z0y1/32/27373_2.png) [@z0y1](https://forum.babylonjs.com/u/z0y1)\
**Post date:** [November 8, 2022, 7:08pm UTC](https://forum.babylonjs.com/t/movewithcollisions-boxes-overlap/35520/1 "2022-11-08T19:08:02Z")

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![2022-11-09 02.53.48](https://us1.discourse-cdn.com/flex024/uploads/babylonjs/original/3X/b/0/b08de8cf02cca14998a0f3b75065333672ec1595.png)  
two box overlapped by moveWithCollisions，am I missing some setting?

my demo with WASD to control box

> **[Babylon.js Playground](https://www.babylonjs-playground.com/#9WPDYQ%238)**
>
> Babylon.js playground is a live editor for Babylon.js WebGL 3D scenes

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**Author:** ![Blake](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/blake/32/21509_2.png) [@Blake](https://forum.babylonjs.com/u/Blake)\
**Post date:** [November 8, 2022, 7:35pm UTC](https://forum.babylonjs.com/t/movewithcollisions-boxes-overlap/35520/2 "2022-11-08T19:35:58Z")

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Heya, the default ellipsoid size used for collision checks is the wrong size for your mesh, eg (1, 1, 1) works well in this case. I also added spheres to show the ellipsoids so that it’s easier to see what’s going on. 🙂

> **[Babylon.js Playground](https://www.babylonjs-playground.com/#9WPDYQ%239)**
>
> Babylon.js playground is a live editor for Babylon.js WebGL 3D scenes

EDIT: You could also try using box impostors with a physics system like ammo for more accurate collisions since the physics body would fit the box mesh perfectly…

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**Author:** ![z0y1](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/z0y1/32/27373_2.png) [@z0y1](https://forum.babylonjs.com/u/z0y1)\
**Post date:** [November 9, 2022, 6:38am UTC](https://forum.babylonjs.com/t/movewithcollisions-boxes-overlap/35520/3 "2022-11-09T06:38:35Z")

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Thank you for your quick reply, it’s very helpful.