Still problems with this command…
If you extend the border © with the option “join = no”, it’s ok.
If extending the edges (a) and (b) the command merges everything into a single surface (the option “join = no” is not recognized).
Also, why can extend the edge (a) only to a certain point? Who or what determines the extension limit? (in fact, by moving the cursor to a certain point this disappears, as well as disappearing the preview that highlights the possible extension).
extend srf problem.3dm (47.1 KB)