Offset Curve on Surface


i am trying to generate a offset curve on the surface. The curve should go inside.
Thanks in advance.


image (5.4 KB)


Question is a bit vague… but here you go
This is one tricky surface actually. Offset the arc on the surface is actually simple.
But offset the bottom is harder since those two lines (or one poly) would become a curve.
I used a trick that come close to an offset in this case, but you might wanna double check if it is close enough for the use of this.

cheers (15.0 KB)