Hello I have been using some of the answers here to set the InverseInertia in PhysicsMass to 0 for x and y in order to achieve "one axis" physics. This has been working fine for the most part however it doesn't seem to work 100%. is this how its supposed to be? anything that can be done to achieve physics on 1 axis i have some debris that explode and most of them stay on the x axis but quite a few of them behave like there is no constraints so the desired behaviour needs to be movement on X and Y axis and rotation Z or all rotation axis. The most important is no Z translation.... Thanks!!