A while ago I had a question about how to link to active rigid bodies “Linking two active rigid bodies”
OK, it somehow worked for that moment, but now I need a more precise solution. I am trying to make it simple. What I am looking for is a way to constrain two spherical active rigid bodies with pin constrains. A smaller body is constrained inside a big one, to fix its position. Both of them are connected to gravity as well. Because the smaller one is not in the center of the bigger one, the bigger one starts to roll on a surface whereas the smaller one is following the movement.
But now, I would like to key frame the rotation of the smaller one a long its Z axis (360°). So when it starts to rotate, it drags the whole thing into a certain direction.
The problem is, that the rotate x y z attribute of the smaller one is already connected to the pin constrains. That means I can not add a key framed rotation to it. Even when I group them I can not add a rotation.
Does anybody of you have an idea how to combine/add two rotations on one object, without breaking the connection to a rigid body? Perhaps with an expression? I tried it with driven keys, but without success.
Thanks a lot