Once points have “touched” each other, or occupied the same space, the surface is unable to cleanly offset. On the surfaces on the left, I selected the two corner points of the surface and used the scale handles to symmetrically scale them to very near each other. I am able to OffsetSrf with expected results.
On the surface on the right, I selected the two corner points of the surface and used the scale handles to symmetrically scale them close together, and they snapped onto each other/on top of each other/occupied the same coordinates. I then selected each point individually and moved each to the right and left, to recreate a symmetrical gap. When I OffsetSrf, the surface appears strange, and does not offset properly.
Why do the points get “damaged” when they touch each other or occupy the same point in space? What am I not understanding about how points of surfaces are handled in Rhino?
Enlarged view of left surface (correct)
Enlarged view of right surface (incorrect):
