The following are some tips to preparing 3ds Max skinning so it can be read correctly in MotionBuilder.
- 3ds Max Weighting is supported only when applied to an Editable mesh or Editable poly. 
 
- Skin and Physique are the only two 3ds Max weighting modifiers supported by MotionBuilder.
 
- You can apply Skin modifiers to two different objects in the same scene.
 
- Negative scaling on meshes that act as weight on a skeleton is not supported. 
 
Physique Modifier Issues
Only Rigid envelopes are supported in MotionBuilder. Deformable and Partial blending envelopes are automatically converted to rigid envelopes in MotionBuilder.