Probably corner case of library. Version 3.2.5.
I have static cube as btBoxShape + dynamic sphere as btSphereShape.
As image shows sphere not roling properly on inclined box surface if it is rotated 5 - 10 degrees around Z axis. If rotation angle less than 5 degrees or more than 10 everything works good.
In my case friction of cube = 2, friction of sphere = 80.
I found the more I increase friction of sphere and cube the worse it gets. (sphere bechavior on inclined box surface).
Probably corner case of library. Version 3.2.5. I have static cube as btBoxShape + dynamic sphere as btSphereShape.
As image shows sphere not roling properly on inclined box surface if it is rotated 5 - 10 degrees around Z axis. If rotation angle less than 5 degrees or more than 10 everything works good. In my case friction of cube = 2, friction of sphere = 80. I found the more I increase friction of sphere and cube the worse it gets. (sphere bechavior on inclined box surface).