The idea is to run reshaping for every boundary vertex of a grid rather than trying to copy boundary grid elements. While this is somewhat slower, this avoids all this tangent flipping magic, which tempts to be rather tricky and fragile.
The idea is to run reshaping for every boundary vertex of a grid rather than trying to copy boundary grid elements. While this is somewhat slower, this avoids all this tangent flipping magic, which tempts to be rather tricky and fragile.