# Object behave like they are made of rubber

**URL:** <https://forums.developer.nvidia.com/t/object-behave-like-they-are-made-of-rubber/38149>\
**Category:** Physics Modeling (closed)\
**Created:** [May 30, 2015, 5:01pm UTC](https://forums.developer.nvidia.com/t/object-behave-like-they-are-made-of-rubber/38149 "2015-05-30T17:01:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Triker](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@Triker](https://forums.developer.nvidia.com/u/Triker)\
**Post date:** [May 30, 2015, 5:01pm UTC](https://forums.developer.nvidia.com/t/object-behave-like-they-are-made-of-rubber/38149/1 "2015-05-30T17:01:24Z")

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I am very new to PhysX and try a rather simple thing: A stack of 10 Boxes size 0.75/0.1/0.2  
In the Moment the simulation begins, all boxes are pressed together as if they where made of rubber and then the whole stack is falling to a side.  
The objects are created with the PxCreateDynamic function. The density is 520 and the material has the parametes 0.5 (static) 0.4 (dynamic) 0.05 (restitution).

The boxes stack is based on a bigger box created with PxCreateStatic using the same material.

Can anybody tell me what parameter I might be missing?

I recorded the whole action with the PhsX Visual Debugger. If it is helpful, the whole simulation is here:[url][http://1drv.ms/1EI7hVL[/url]](http://1drv.ms/1EI7hVL%5B/url%5D)

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<div class="post-metadata">

**Author:** ![Triker](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@Triker](https://forums.developer.nvidia.com/u/Triker)\
**Post date:** [June 4, 2015, 9:11am UTC](https://forums.developer.nvidia.com/t/object-behave-like-they-are-made-of-rubber/38149/2 "2015-06-04T09:11:27Z")

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I found a solution that seems to work:

I increased the number of calls to the simulate() function. Instead of once per 1/60 second I call it now once per 1/600 seconds. That makes the boxes stack much more stable.