Glad you got it to run; the code should be sound. I am working on an upgrade to add more bells & whistles, but it sounds like it should do what you want. I believe there is an example similar to that in the files, where you cut the inside and the outside of a bowl.
I didn't see an email/message though ... how and where did you send it?
WarpDriver, StandingWave, Topo and gadgets available at PaulRowntree.weebly.com