Rolling dice in Reality Composer

I'm trying to create a simple dice game in RC.


I created a board (with a rim) as well as some dice in blender (added rigid bodies and mesh-colliders to it), exported them as .obj-files and converted them to usdz-files using usdzconvert.


Now, the first problem I have is that the dice won't «roll» correctly. I used gummi as material which makes the dice somewhat tumble and turn accross the surface, but they end up on their corners sometimes instead of their plane sides. I tried every possible collision type to no avail.


Second is, that the «rim» of the board can't act as a collider. I tried to use the automatic collision detection which seemed to be like a mesh collider. But the rim (which is basically just a ring) seems to be solid. The dice end up on top of the ring instead in its boundaries.


Is something like this even possible in RC or do I have to make everything programmatically?


Any help is greatly appreciated!