I have a very basic physics problem.
Setup:
I have one rigid body sitting on top of another rigid body.
The lower rigid body is being rotated via its transform.
Expected behavior: the rigid body on top rotates perfectly, along with the one it is on top of.
The problem: the rigid body on top does not rotate, or at least not the way it should - just a little, off and on.
It’s usually not a very good idea to change the position of a rigidbody through the transform interface.
You might want to add forces / torque or set the velocity directly instead.
What exactly are you trying to do?
I thought that might be the case.
Here’s what I’m trying to do. I want to have various RB’s sitting atop a rotating platform, which is also an RB. As the platform object rotates, the RB objects on top of it should move with it.
Unfortunately, rotating the platform via direct manipulation of its transform resullts in “slippery” rotation of the objects on top of it. If It turn the gravity for the objects atop the platform off, they move as they should, but that’s not useful, since I need them to have gravity. Manipulating the drag params for the objects does not help either.
I’ve tried placing the platform and objects in an empty object and rotating the empty object, withthe same results.
Any ideas?
Attach a hinge joint to moving platform.
Set it up to rotate using a motor.
The hingejoint will make sure it rotates only around one axis (the up vector in your case) and the hingejoint will make sure it is rotating at some speed you define.