How to find out which triangle mesh is colliding

[oscar_chen]

Hi there.

I am using GImpactMeshShape as the collision shape, for it is difficult to perform convex decomposition on the moving concave object. When I using Bullet to detect the collision between GImpactMeshShape and a primitive, I can get the contact points in the contact manifold, but how do I find out which triangle mesh is colliding?

Thanks ahead