Fixed Joint with Inertia Tensor

Unity Engine
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1

Hi

EXAMPLE
2 cubes on top of each other (similar to the RigidBody joint setup in the example)

I am trying to get a simple fixed joint working with inertia tensor X and Y set to 0

When i try with inertia tensor to ON the joint doesn’t work very well anymore, it seems to fold and eventually the 2 cubes will be in same position.

With no inertia tensor the 2 cubes always seem to be on top of each other and move together as one

Any ideas?

2

The Rigid Joint is working in 3D, however by setting the inverse inertia tensor in X and Y to 0 effectively stops the Joint from correcting the error.
If you set only one body in the pair to have a tweaked inertia tensor the fixed joint should work.
Alternatively, you can just a joint that focus on fewer axis (e.g. a limited hinge with zero limits) works are well.
The best thing would be if you created your only Joint with a single angular Constraint atom that only worked on the remaining free axis of rotation.