# AMMO.JS Collision Response And Filtering

**URL:** <https://forum.babylonjs.com/t/ammo-js-collision-response-and-filtering/1493>\
**Category:** Questions\
**Created:** [February 20, 2019, 12:39pm UTC](https://forum.babylonjs.com/t/ammo-js-collision-response-and-filtering/1493 "2019-02-20T12:39:37Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![Wingnut](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/wingnut/32/53_2.png) [@Wingnut](https://forum.babylonjs.com/u/Wingnut)\
**Post date:** [February 20, 2019, 7:30pm UTC](https://forum.babylonjs.com/t/ammo-js-collision-response-and-filtering/1493/3 "2019-02-20T19:30:40Z")

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Hi guys. If I may slide-in an AmmoJS testing playground…

[https://playground.babylonjs.com/#XHU1HH#1](https://playground.babylonjs.com/#XHU1HH#1)

(thanks to @JohnK/others… for initial playground)

See console. Line 124 reports undefined. (yawn)

Line 125 reports an object… difficult to “browse” for me, so far. I don’t do object-inspecting very well… for these a.prototype.b.c.lotsOfMembers objects.

Just possibly… a unique collision-config needs setting, and then the collision masks/groups… will work.  
Anyway, we have a testing playground… maybe. 🙂

> <https://github.com/kripken/ammo.js/blob/7c5e8734f12f0b036ddc8253e93d0e5348c52307/ammo.idl#L155>

Those properties definitely exist in Ammo. 🙂 Party on, gang. I hope I have helped.

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