possible friction error

[binofet]

If you place a box on a flat box and give it a linearvelocity to slide on the box it is sitting on, it will usually curve to the right or the left. . . why is that? shouldn't it travel in a straight line and come to rest?

this can be replicated in any of the demos by changing the shootbox method in DemoApplication.cpp to place a box on the ground and give it a linear velocity.

Bino

[Erwin Coumans]

If you place a box on a flat box and give it a linearvelocity to slide on the box it is sitting on, it will usually curve to the right or the left. . . why is that? shouldn't it travel in a straight line and come to rest?

Yes, there is some approximation going on that causes this issue. Will be added to the todo list.

Thanks,
Erwin

[Erwin Coumans]

This should be fixed in the latest Subversion, and in upcoming Bullet 2.63.

Can you try this Bullet 2.63 preview and report if it is solved?

Thanks,
Erwin