Hello. I would like to know if there is a way to use constraints functionality for older (free license) versions of Unity which don't seem to support .constraints property of rigidbody. What I am trying to achieve is a rigidbody (which is subject to forces and attached by a spring joint to another body) to be rotateable on only one axis and rotation frozen on other two, like what freezeRotation does for all 3 axis but with one being free to rotate around. Any outside libs or ideas how to solve this? It is a very active rigidbody and often updated in FixedUpdate so I don't think simple resetting two axis of rotation will do the trick, preferably it should work almost as smooth as freezeRotation without jerkiness. Thanks.