# How do you move constrained objects manually?

**URL:** <https://forum.babylonjs.com/t/how-do-you-move-constrained-objects-manually/58322>\
**Category:** Questions\
**Tags:** physics, havok\
**Created:** [May 8, 2025, 9:47pm UTC](https://forum.babylonjs.com/t/how-do-you-move-constrained-objects-manually/58322 "2025-05-08T21:47:40Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Mike](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/mike/32/45471_2.png) [@Mike](https://forum.babylonjs.com/u/Mike)\
**Post date:** [May 8, 2025, 9:47pm UTC](https://forum.babylonjs.com/t/how-do-you-move-constrained-objects-manually/58322/1 "2025-05-08T21:47:40Z")

</div>

I modeled and rigged a simple Bomberman-esque bomb in Blender.

I’m bringing it into my scene and trying to add physics to the fuse.

After fiddling with constraints for a few nights, I finally have this:

> **[Babylon.js Playground](https://playground.babylonjs.com/#JKXXWS%232)**
>
> Babylon.js playground is a live editor for Babylon.js WebGL and WebGPU 3D scenes

But I’ve found that now I can’t manipulate the bomb itself anymore!

How do you control rotation and position of an object that’s tied to a PhysicsAggregate?

I suspected it could be due to the fact that the body is “constrained to” the fuse, so I took the liberty of reversing the relationships to no avail: [https://playground.babylonjs.com/#A5J7CR#2](https://playground.babylonjs.com/#A5J7CR#2)

---

<div class="post-metadata">

**Author:** ![Deltakosh](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/deltakosh/32/26635_2.png) [@Deltakosh](https://forum.babylonjs.com/u/Deltakosh)\
**Post date:** [May 8, 2025, 11:07pm UTC](https://forum.babylonjs.com/t/how-do-you-move-constrained-objects-manually/58322/2 "2025-05-08T23:07:35Z")

</div>

cc @Cedric (be patient he is on vacation for another week :))

---

<div class="post-metadata">

**Author:** ![Cedric](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/cedric/32/2742_2.png) [@Cedric](https://forum.babylonjs.com/u/Cedric)\
**Post date:** [May 12, 2025, 8:57am UTC](https://forum.babylonjs.com/t/how-do-you-move-constrained-objects-manually/58322/3 "2025-05-12T08:57:49Z")

</div>

Hi @Mike welcome to the forum.  
I think it has to do with [Babylon.js docs](https://doc.babylonjs.com/features/featuresDeepDive/physics/prestep/)  
like this : [https://playground.babylonjs.com/#JKXXWS#4](https://playground.babylonjs.com/#JKXXWS#4)

Another solution to make it spin is to set angular velocity to the body.