Well Antonio if you want to do that with C# (BTW 1 to 10 what is your experience ?) … your first task is to master inwards (or outwards [holes]) the polyline offset puzzle. Hint: for a given Brep Face make inner Loops (holes) clockwise and outer Loops counterclockwise (Or the inverse). Finally you get stuff like this:
Then using some Methods from above it’s a matter of recursion (from a given node go back and forward etc etc). I can give you some hints on that matter after you have fixed the poly offset challenge:
