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Is it necessary to work with cutting SMD meshes? Can't you take meshes from OBJ and apply SMD skinning to them?
Secondly, I try to minimize the number of formats used to avoid errors like in the screenshot.
The skinning might have been copied incorrectly from the SMD, and OBJ is NOT the same thing. If you exported the model through an editor, you need to use the skeleton that you loaded with the model in ArchanGel and exported to SMD (the original Nival one, not exporting it in a new way).