Double/single curvature test

Is there a way to have grasshopper test (by component or script) if a surface is single or double curved?

Best

Jacob

Replies to This Discussion

Permalink Reply by Rémy Maurcot on November 5, 2014 at 8:34am

Maybe with this definition that tries to unroll a Brep.

If it does not unroll it is double curvature.
If it unroll it is simple curvature.

Attachments:

TestUnroll.gh, 5 KB

Permalink Reply by Jacob Riiber on November 6, 2014 at 3:31am

Thanks Remy

Tried something similar with Python. Seems that you need the tolerances at 0 to be certain of the result (in my case I needed to check a surface with hardly any curvature, so the default unroller seemed to be a little too forgiving)

Attachments:

Single_double_curvature_Test.gh, 4 KB

Permalink Reply by Peter Kluck on November 6, 2014 at 4:45am

OSC will do it.

Best, Peter

Permalink Reply by Jacob Riiber on November 6, 2014 at 5:29am

Thanks Peter

This actually reveals that the above solutions using unroll are flawed (and of course a bit un-elegant). The surface I am analyzing could be unrolled at 0 tolerance (must admit I do not entirely know the technical details of what the tolerances mean) but using the OSC shows that it is in fact double curved.

Permalink Reply by Rémy Maurcot on November 6, 2014 at 5:50am

Same with GH native component.

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