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

Replies to This Discussion

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

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

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

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

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