Sectioning a Surface

Hi,

What is the best method to get a curve of a surface section? Right now I have perpendicular surfaces cutting through the surface in question and then using brep intersection to get a section curve. This is a really slow and inefficient method, I find it hard to believe that this would be the only method.

If anyone has any suggestions I'd appreciate it.

Thanks,
Adam

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Permalink Reply by Mitch Heynick on April 16, 2010 at 4:44am

Are they straight sections? You could try creating a series of planes and using Intersect>Mathematical>BRep -Plane intersections. These are infinite cutting planes, so all you need to do is define the plane... It's like the Rhino Section tool. Don't know if it's faster than Brep-Brep... --Mitch

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Permalink Reply by robert cervellione on April 16, 2010 at 12:07pm

you can use a component that runs rhinoContour in GH. it runs relatively fast. you can get it at www.cerver.org

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Permalink Reply by Adam Laskowitz on April 16, 2010 at 1:02pm

Mitch, I believe that is already what I'm doing, I have switched to using Plane intersection but it still is slow and acting kind of funky (my surface is heavily undulated and I have it set up to sample about 100 sections through it, although it is only 1 at a time).

Robert, that looks promising although I am not at a computer with rhino/grasshopper on it at the moment so I will check that out later.

Thanks

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Permalink Reply by Mitch Heynick on April 16, 2010 at 2:30pm

Well, 100 sections through a heavily undulated surface will make a lot of data - keeping it dynamic, I'm not sure that there is any way to speed that up, unless there is some sort of lightweight preview... --Mitch