http://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/documentation/3DSMAX/16/ENU/3ds-Max-Help/files/GUID-1D637181-862A-49C9-B6BE-4E7982549C57-htm.html
конкретнее:
http://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/documentation/3DSMAX/16/ENU/3ds-Max-Help/files/GUID-59C8C203-A9E1-4EAA-8B37-3A7F1E8E96C6-htm.html
спасибо за помощь