I have a question about rigid body constraints.
Generic spring constraints can be used for a normal spring that tries to return to an original length by setting the stiffness.
However, what I want is a spring for rotation that tries to return to it's original rotation state. It seems that the generic spring's stiffness parameter is only for length and not for rotation. I can limit the rotation angle, but, that's just a limit setting and not for spring strength or anything.
Is there a way to make a rotational spring?