Suppose you were to have a crate (non-kinematic rigidbody) resting atop a platform (kinematic, movement is script-controlled), the crate will simply slide along the platform as though its surface had no velocity; as though it teleported small amounts underneath the crate to give the illusion of movement rather than actually moving and carrying rigidbodies with it. Is there a way to fix this? I know that I could perhaps use a rigidbody with extremely high mass, or use fixed joints, but these are not ideal. The intention was to allow my gameplay designer to use the IsKinematic flag and the conveniences that come with it while still having it interact naturally with rigidbodies. I'll experiment for a solution on my own and report my findings here, but this seems like the sort of thing that you'd expect to just work, and the solution is just hiding somewhere in plain sight.