"I have been trying to create a mobius ring band, where there is a smooth transition from vertical plane to horizontal plane and back to a vertically flipped plane. I have tried various ways in rhino but the transition is always too smooth, it seems…"
"Here's what you need to do:
1. in your spreadsheet, delete column B. It is empty and I guess not needed. This will make it easier to retrieve the right data afterwards. I made an example spreadsheet, since your file was not provided...