UNFOLD3D Generation 6 User Manual: "3.1 - Modeling Rules
Unfold3D requires the input mesh to respect a certain number of modeling rules. These rules are generally respected as rules of general modeling hygiene, but they become compulsory to apply Unfold3D's mathematical algorithms:
Note that these rules do not limit the possibilities of modeling:
Unfold3D has no problem dealing with holes in the mesh;
the modeling rules are written for triangles, but Unfold3D is perfectly fit to deal with quads or n-gons - Unfold3D will triangulate the mesh anyway, and try to avoid as much as possible the forbidden cases.
Note that non-convex n-gons may cause problems though:"
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