See https://code.google.com/archive/p/bullet/issues/636 http://bulletphysics.org/Bullet/phpBB3/viewtopic.php?f=9&t=8237 and https://github.com/bulletphysics/bullet3/issues/125
See https://code.google.com/archive/p/bullet/issues/636 http://bulletphysics.org/Bullet/phpBB3/viewtopic.php?f=9&t=8237 and https://github.com/bulletphysics/bullet3/issues/125