Hey guys, thank you for your advices.
Spatial thing = assetManager.loadModel("Models/things/thing.j3o");
RigidBodyControl thingMesh = new RigidBodyControl();
thingMesh.setPhysicsLocation(new Vector3f(5, 1.005f, 2));
That’s exacly my code. I copied the code from the table and did only rename so you can be sure the table is done the same.
I never use triangulate modifier in Blender. And I haven’t any problems before.
I’m now recording a video how it falls. I will upload it in few minutes.