NurbsCurve to Circle Conversion

Hi David,

Just curious but why does Grasshopper behave this way:

Attachments:

circleConversion.gh, 28 KB

Replies to This Discussion

Permalink Reply by David Rutten on January 28, 2014 at 11:03am

Ah the fickle finger of fate...

It's clearly a bug of some description. All circle-like curves should convert to circles when prompted to do so.

I haven't looked into it just yet, but my guess is the roundtrip via Nurbs curves somehow fixes a problem with the original curves.

David Rutten

david@mcneel.com

Permalink Reply by David Rutten on January 28, 2014 at 3:41pm

The problem seems to be that the original curve is a PolyCurve. They don't know how to convert themselves to arcs evidently. This is -in my opinion- a bug in the Rhino SDK. I've fixed it in Grasshopper for the time being.

David Rutten

david@mcneel.com

Permalink Reply by Danny Boyes on January 28, 2014 at 4:22pm

Thank you. The problem cropped up in the mcneel forums on discourse. Vb isCircle was giving one result whilst rhinoscript isCircle was giving another. Brian`s answers were tolerance related but it didn`t ring true to me when gh was behaving this way. It seemed to be more of wheel off than tolerance.

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