Well, my use-case was simply, that i added support for collisions with concave meshes into my engine and i needed some concave geometry to test whether it works, so i created that torus. It is nothing, that i would expect to have in a real level (in that size and detail), but i was still wondering, whether i was doing something fundamentally wrong.

But thanks for the detailed explanation, in which cases exactly that warning appears.

I have uses Ageia's physics-engine for quite some time, since it was the only professional and free engine available. But working with that engine was a nightmare, especially because of their almost non-existing support. Now that Havok is free, i am converting my whole engine over, which works quite well so far. Havoks asserts and messages are very helpful and i want to really understand what they mean, that's why i ask so many questions lately ;-)

I really have to add, that the support from you guys on this forum is amazing. From Ageia i was used to have to wait at least a weak, before i got any answer, at all, and it usually was something crappy like "read documentation" (yes, some of them were not even able to formulate half-decent english sentences). So, in the next two weeks, while i learn Havok and convert my code, you can expect a lot more questions from me ;-)

Thanks,
Jan.