trying to load COLLADA file with these flags :
(aiProcess_MakeLeftHanded | aiProcess_CalcTangentSpace | aiProcess_JoinIdenticalVertices | aiProcess_Triangulate)
but the result in d3d application seems like it's still in right-handed (3dsmax) coordinate system.
so I had to cut the aiProcess_MakeLeftHanded flag and transform each vertex/normal by my own custom matrix, the resulting mesh was correct.
it also doesn't flip triangle winding orders and UVs as mentioned in documentation.
- Sepul
see https://github.com/assimp/assimp/issues/156