Boundaries > Create > Along Non-Oriented Edges When point objects have been merged and then wrapped, it may appear that the yellow back-side and blue front-side in certain areas of the polygon model are reversed. In that case, use Tools > Make Manifold to delete extraneous polygons, and if the problem persists, use this function to create a boundary line between front-facing and rear-facing triangles and then use Polygons > Boolean Operations.