# Gravity problem

**URL:** <https://forum.babylonjs.com/t/gravity-problem/17000>\
**Category:** Questions\
**Created:** [December 29, 2020, 1:21pm UTC](https://forum.babylonjs.com/t/gravity-problem/17000 "2020-12-29T13:21:59Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![REX\_DUNGEUR](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/rex_dungeur/32/17559_2.png) [@REX\_DUNGEUR](https://forum.babylonjs.com/u/REX_DUNGEUR)\
**Post date:** [December 29, 2020, 1:21pm UTC](https://forum.babylonjs.com/t/gravity-problem/17000/1 "2020-12-29T13:21:59Z")

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Hi all!  
I’ve build a little figure and now I would to use physics. My goal is, that the figure falls down if the figure leaves the brink. But that isn’t so easy…  
Here the link: [Babylon.js Playground](https://playground.babylonjs.com/#VPHVFI)  
Yours,  
**RD**

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**Author:** ![sebavan](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/sebavan/32/57_2.png) [@sebavan](https://forum.babylonjs.com/u/sebavan)\
**Post date:** [December 29, 2020, 1:28pm UTC](https://forum.babylonjs.com/t/gravity-problem/17000/2 "2020-12-29T13:28:08Z")

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You would need to add an impostor for the player as well.

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**Author:** ![REX\_DUNGEUR](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/rex_dungeur/32/17559_2.png) [@REX\_DUNGEUR](https://forum.babylonjs.com/u/REX_DUNGEUR)\
**Post date:** [December 29, 2020, 1:38pm UTC](https://forum.babylonjs.com/t/gravity-problem/17000/3 "2020-12-29T13:38:38Z")

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Impostor? What do you mean? Can you give me a example?

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**Author:** ![sebavan](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/sebavan/32/57_2.png) [@sebavan](https://forum.babylonjs.com/u/sebavan)\
**Post date:** [December 29, 2020, 3:49pm UTC](https://forum.babylonjs.com/t/gravity-problem/17000/5 "2020-12-29T15:49:54Z")

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You could start looking into all the examples here: [Using A Physics Engine | Babylon.js Documentation](https://doc.babylonjs.com/divingDeeper/physics/usingPhysicsEngine#impostors)

Basically if you want to use a phisics engine the relationship between your visual elements (meshes) and the physics engine is done through imposters.

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<div class="post-metadata">

**Author:** ![REX\_DUNGEUR](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/rex_dungeur/32/17559_2.png) [@REX\_DUNGEUR](https://forum.babylonjs.com/u/REX_DUNGEUR)\
**Post date:** [December 30, 2020, 11:08am UTC](https://forum.babylonjs.com/t/gravity-problem/17000/6 "2020-12-30T11:08:40Z")

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Can somebody give me a playground example with the player in [Babylon.js Playground](https://playground.babylonjs.com/#VPHVFI) ?

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**Author:** ![REX\_DUNGEUR](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/rex_dungeur/32/17559_2.png) [@REX\_DUNGEUR](https://forum.babylonjs.com/u/REX_DUNGEUR)\
**Post date:** [December 30, 2020, 11:28am UTC](https://forum.babylonjs.com/t/gravity-problem/17000/8 "2020-12-30T11:28:05Z")

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I’ve tried that too, but than I can’t control the player.

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<div class="post-metadata">

**Author:** ![REX\_DUNGEUR](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/rex_dungeur/32/17559_2.png) [@REX\_DUNGEUR](https://forum.babylonjs.com/u/REX_DUNGEUR)\
**Post date:** [December 30, 2020, 11:56am UTC](https://forum.babylonjs.com/t/gravity-problem/17000/10 "2020-12-30T11:56:17Z")

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Oh, that was so clear… 🙄  
Thanks for your help!

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<div class="post-metadata">

**Author:** ![REX\_DUNGEUR](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/rex_dungeur/32/17559_2.png) [@REX\_DUNGEUR](https://forum.babylonjs.com/u/REX_DUNGEUR)\
**Post date:** [December 30, 2020, 12:02pm UTC](https://forum.babylonjs.com/t/gravity-problem/17000/12 "2020-12-30T12:02:13Z")

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Thanks again!