I was thinking that you could just set the edges to hidden in the morph before you save it as an object.
This may help you find them in the script so you can make them parametric - could be tricky to work out which bits of the code they are otherwise.
I prefer to use RULED for this type of thing.
Basically just the co-ordinates for two polygons and you can specify the height difference between them.
Very easy to control the visibility of each of these polygons.
Then you just stack RULED statements together so that the next RULED uses the co-ordinates from the second polygon in the previous RULED statement.
Not as simple as creating a mesh and saving as an object but it is very easy to control visibility of edges and even adjust the heights (for example a basin depth).
Barry.
One of the forum moderators.
Versions 6.5 to 27
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11