Split Surface with Curves

All,

I am having issues getting the split surface function to work properly. I am trying to cut a bunch of curves out of a surface, but when the Split Surface function runs, it generates a bunch of surfaces all cut by a number of the curves (randomly). Must be doing something wrong but I cant figure out what the issue is.

Attachments:

Parking Garage #2-Tree Image for Perf-Section6.jpg, 233 KB
TreeCanopy-Circle Perf3.gh, 411 KB

Replies to This Discussion

Permalink Reply by Joseph Oster on September 21, 2017 at 9:53pm

You must flatten the 'Crv (C)' input to 'SrfSplit' and then choose the largest surface in the list of results. If you're lucky, it will be the first or last item; otherwise, sorting by area or sum of edge lengths will do. Unfortunately, given the number of holes, 'SrfSplit' takes a very long time...

Permalink Reply by Joseph Oster on September 22, 2017 at 6:59am

I let the laptop run overnight on 'SrfSplit'... 7.3 hours for 3072 holes, resulting in 3073 surfaces. The first one in the list (green group) is the largest, confirmed by the sum ('MA') of its edge lengths:

You might find this thread interesting: http://www.grasshopper3d.com/forum/topics/image-sampler-with-surface

Dividing the base surface using 'SubSrf (Isotrim)' before perforation with 'SrfSplit' reduces the number of holes per surface, which greatly reduces the running time for 'SrfSplit'.