Est. Budget: $15.00
1 From a 3ds max model with high poly count, clean up the model and export its .FBX file for Unity-3D.
2 From another 3ds max model with low poly count, do the same thing and export its .FBX file for Unity-3D.
3 Open both .FBX files in Unity-3D, ensure and check that all sub meshes have identical (or almost identical) transforms (i.e. translation, rotation, and scale). If not, fix and clean up the original 3ds max models, export ...