Hi
My expirience tells me that MeshMeshFast() is fast.
I used to solve some similar problems and applied same technic to yours - mesh/mesh collision detection, my sollution is attached in cs file.
I use RTree to find all meshes whose boundingBoxes intersesct and only these meshes I check for cillision by MeshMeshFast() method. Hope that this helps.
Regards,
Radovan
MeshCollision.cs (4.6 KB)