Real-Time Physics Simulation Forum

Hi,

I am new to Bullet and as a starting point thought I would get a ball rolling along a surface. I used the RollingFrictionDemo as a starting point, which worked fine. I then changed the btBoxShape to a btBvhTriangleMeshShape and set all the Y coordinates to 0.0.

All seems to work as expected when I apply an impulse to ball in a single axis.

However when I do:
I expected the ball to roll along the given vector until coming to rest as a result of the friction. However the ball starts to move along the vector and then stops moving in X and continues along the Z axis, as shown in XZ position plot below.
Can anyone tell me what is going on, or have I not set part of the physics engine correctly?

Thanks,

LtBrick

For some reason your plot isn't showing for me. Anyway, I'm not sure if this will do anything for you, but IIRC there's a line in the demo about anisotropic rolling friction. Maybe try commenting that out?

Hi bwelch

This is happening with the call to set anisotropic friction.

I found another tread "rolling friction issue" which identified the same issue so added more info to that. Can't seem to find a solution.