Path substraction from nurbs curves

Hey guys!

I am having trouble with a project I'm working on: I've got some nurbs curves (blue) of which I want to substract some "paths" I've drawn (red) but I can't manage to get it to work. The idea is to find the area where the red zone and the blue one are overlapped and then substract the red from the blue one in order to obtain closed curves. I've tried region difference, region unions, all kind of intersections, trimming... I honestly don't know what I'm doing anymore.

I don't know if it's even possible or if I've just been looking at it for so long that I'm simply missing the obvious solution. Any clue?

Thx for you help!

INTERSECTION%20CURVES_PATH.gh

Replies to This Discussion

Permalink Reply by Joseph Oster on June 27, 2015 at 7:40am

Very odd... I don't remember any trouble when I created the file I posted yesterday, but when I just opened it now, GH froze for many minutes... Looking at the Profiler, the 'RDiff' component took 7.6 minutes!!!!

134 boundary surfaces ("BLUE CURVES", Trimmed Surfaces) minus 24 "RED PATH" 'Untrimmed Surfaces', resulting in 162 'Closed Planar Curves'.

That's an average of 19 seconds per "RED PATH". That time varies depending on the size/length of the path - one of the shortest (i=17) takes 11.3 seconds while others take nearly 30 seconds each. Wow. Painful.

Permalink Reply by Jose Ángel on June 28, 2015 at 3:24am

I know... on my laptop (which is actually a pretty good machine) it's been trying for more than 20 minutes without success, sooo; I'll keep it up extruding! thanks anway. Appreciate the interest!