Hello, I have two different curves I have drawn in Rhino, one is an open NURBS curve, degree 2 control points 3 and the other is half of an ellipse so an elliptical arc, degree 2, control points 5. Other than the control points, what makes these curves different? If I input the NURBS curve into a Perp Frame component, the model works fine. If I use the elliptical arc, the Perp Frame component gives me an error.
If I would like to use the elliptical arc, what do I need to do to the curve in Rhino to make it a valid curve for the grasshopper component?
Thanks
the arc has weighted controlpoints, and multiple knots - i guess since you dont provide geometry
arcs.3dm (71.0 KB)
Here are the two arcs.
I have found if I take the elliptical arc and rebuild it using the same amount of control points, then the curve works in GH
Thanks
the eliptic arc is parametrised from 2Pi To 3 Pi
I dont know what parameters you feed it … but usually I work with 0 To 1. so reparametrisation does the job.
I guess, rebuilding the curve changes the shape significantly - espessialy when not rising degree and pointcount.
reparametrise.gh (18.4 KB)
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