Some rigidbodies fall through surface, others dont

Unity Engine
1

Hi, I just tried to make a galton board that shows strange behaviour (see attached file):

The spheres are prefabs (“Spielkugel”), I put 6 of them in the model to show the effect. When I run the scene, only 3 spheres behave correctly as they should. Two of them disappear right at the start, one more falls through the board (“Grundplatte”) some seconds later. I’ve tried this with other positions of the spheres, and I always lost 3 spheres at different times and places.

Do you think this has to do with some settings for the rigidbodies or do the spheres, for some reason, influence each other which makes it impossible to have more of 3 at the same place? It seems to me as a bug, because some spheres behave correctly, others dont, though they are all of the same type…

Thanks in advance

Andreas

896865–33482–$test.unitypackage (7.43 MB)

2

In the package you included, there is only one sphere (“Spielkugel” object). However, if you add 6 spheres at the same position, when you press play they will “fly” in all directions, because they have Rigidbody components on them and that makes them collide and push each other out. What you see is expected. If you want to avoid that and still have 6 spheres on your board, position them in such a way that they don’t intersect each other (e.g. stacked on top of each other)