I am spawning ("solid") items from some hightwith a slight delay. The items are stacking up to a tower, but every item in the tower is bouncing slightly up/down like not being solid when a new item lands at the top.
What settings do I have to change to stop this “bounciness”?
Check first and make sure the items have a PhysicsMaterial with Bounce above 0, or a physics_material_override doing the same, that’s the literal setting for it. Looks like Jolt also has Physics > Jolt Physics 3D > Simulation > Bounce Velocity Threshold, which is the relative speed below which bounce gets ignored completely, so raising that kills the small ones while leaving hard impacts alone. I’d start there at least.
After experimenting a bit with your settings, it turned out I was dealing with “penetration” issues that were being corrected in a very “bouncy” way.
I adjusted the “penetration_slop” and “baumgarte_stabilization_factor” settings. That seems to have largely resolved the behavior.