Hello, I need help trying to map square grid onto an irregular surface. Not subdivide it into grid cells, but make a grid fit onto an irregular surface (maintaining equal number of u and v segments).
BTW: The Morphs classes (8 available) work against the underlying BrepFace surface (if applicable per class) therefor you maybe need to add this surface as a visual indication upon what's happening and why the U/V works that way on the target surface.
search for grid to surfaces examples, but i think that your problem its that you are using a trimmed surface (you need an untrimmed surface for that examples work). So try to recreate your surface as untrimmed surface.