I have ten object in my obj file. I use aiProcess_PreTransformVertices to read file,but the pScene->mMeshes[i].myname.data = ""; pScene = imp.ReadFile(filename, aiProcess_PreTransformVertices | aiProcess_ConvertToLeftHanded | aiProcessPreset_TargetRealtime_Fast); So,I try to delete aiProcess_PreTransformVertices ,and read file again. it works,but only pScene->mMeshes[0].myname became material's name. The others pScene->mMeshes[i].myname are correct. I want to know where i can find my first object...