Shell over Frame Structure

Hello,

I am currently trying to lay a layer over the supporting structure of my building, but not everywhere. The supporting structure should still be visible in the lower areas. Could someone tell me how to exclude these parts?

I know it’s all very vague, but I don’t even know what exactly to google to get an answer. I’m attaching a few pictures that might help.

Looking forward to your answers.

Greetings Fabian



I found a solution that works for me at the moment.
For anyone having the same issue:


Domain End > Expression = x-1
Base Curve = Parameterize

Best regards