Editable_Poly Get By Material ID Methods

polyop.getVertsByMatId <Poly poly> <int material_id> 

NEW in 3ds Max 2023: Returns an array of vertices that belong to faces that match the specified material_id for the specified poly.

polyop.getFacesByMatId <Poly poly> <int material_id> 

NEW in 3ds Max 2023: Returns an array of faces that match the specified material_id for the specified poly.