Allowing small rigidbodies to spin when colliding with surfaces

Hello everybody,

I have a little ball (sphere collider) that falls down on a slopped surface. When I set the size to 1.0 (giving a mesh around 10cm wide), the ball will bounce without any rotation, as if it was just sliding. If I set higher values, it will start spinning on contact, as it should be.
I've read some things about Unity using collider size to compute interactions, but I really need to keep size to 1.0 and to get some spinning. Is there a workaround to prevent this behavior? Maybe some "world physic scale" parameter or something?

Thank you.

 

You should configure the Physics Material of the ball. Friction should give the ball some rotation on collisions:
https://docs.unity3d.com/Manual/class-PhysicMaterial.html

 

Thanks, but I've already set a physical material (1.0 in each fields, "combine" set to "multiplied"). Terrain also has a physical material (0.6 in each fields, "combine" set to "multiplied")...
I tried modifying Mass, Drag and Friction, behavior is the same...

 

It seems I've managed to overcome this issue by using a Capsule Collider instead of a Sphere one. Simply set Height to 0.0 and you have a working Sphere Collider.
Well... I guess it's heavier, though.