possible collision response bug with internal edges and spheres (was googlecode Issue 706)

[erwincoumans]

See https://code.google.com/p/bullet/issues/detail?id=706&colspec=Modified%20ID%20Type%20Stars%20Status%20Owner%20Summary

[jazztickets]

Can you look at this issue or give some guidance on workarounds, Erwin?

[erwincoumans]

closing out-of-date issues

[jazztickets]

I mean, the issue still happens in the latest version...

[erwincoumans]

No clear reproduction case. What does this test do exactly?
https://github.com/jazztickets/btest/blob/master/src/main.cpp
Obviously the internal edge utility changes the contact normal.

[jazztickets]

It's all explained in the original bug report:
https://code.google.com/archive/p/bullet/issues/706

The btest project reproduces the environment setup in the video: https://www.youtube.com/watch?v=71jd0g6PsdE

There's a blender file attached there too. More users have had issues in the referenced issue (libgdx/libgdx#2534 (comment))