I can do this by eye, but would rather have a more exact way to do this.
Hi Simon - what are you doing, exactly? Are you extracting an isourve that is at a set distance from an existing curve or extracting multiple isos at a set interval? In any case, other than very limited and special cases, the distance will not be constant, so you’ll have to decide where you want to measure it. Running Divide on one of the edge curves might be a good enough way to mark off intervals with points you can snap to.
Thank you Pascal. I will try that.