I'm trying to make a rigid body sphere follow a path while it rests on another rigid body, which I'm tilting in different directions in order to balance the sphere, but I'm not having much success after several failed attempts. It ends up staying in the same place, like the image below, unless I manually keyframe the path but then it instead ignores the physics.

enter image description here

If I remove the path constraint and just treat it as a rigid body, it does react to the tilting plane below but quickly ends up rolling off the plane due to the physics, even if I only rotate the plane along one axis. I also want to be able to loop this which is another reason I want to try and solve this by applying a path constraint. Is it possible to solve this in some way without having to manually keyframe everything? Any help would mean a lot to me.

Here is a link to the blend file if it helps: https://pasteall.org/blend/0f5d12df4024418d935c5e435661f760

  • $\begingroup$ it's not clear this part: "make a rigid body sphere follow a path while it rests on another rigid body". Do you have a reference video of what you are trying to achieve? $\endgroup$
    – Sanbaldo
    Commented Mar 29, 2021 at 20:14
  • $\begingroup$ Do you just want the ball to roll back and forth? $\endgroup$
    Commented Mar 29, 2021 at 22:13
  • $\begingroup$ you can only have one thing at a time: physics OR animated. you can change this behaviour per frame, but you can never have that at the same time $\endgroup$
    – Chris
    Commented Mar 30, 2021 at 1:12
  • $\begingroup$ Yup, I want it to roll back and forth - but in a rather straight path. I realise I would probably have to keyframe this manually in order for this to work. Thanks so much for the clarification as well, Chris! $\endgroup$
    – t.r
    Commented Mar 30, 2021 at 5:48

1 Answer 1


just clear that "animated" checkbox in your sphere and it works.

enter image description here


enter image description here


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