Module fill 

Surface filling: a face fitted over the region four edges bound.

The construction is the transfinite Coons blend of the four boundary curves (which interpolates them exactly), sampled and fitted through the grid machinery, error reported. What the caller gets is a natural face over the fitted patch: the patch’s own chart rectangle is the trim, and the patch boundary stands within the stated fit tolerance of the edges it was asked to fill.

Functions

make_filling

Fill the loop edges bound with a fitted patch face.