Centerpoint Arc to Spline?

Question

Hi,I am drawing a centerpoint arc from three points, namely thecenterpoint, start and endpoint. After I have done this I would liketo find the curve object that corresponds to the arc. I use to do this and it seems that I get the Curvereturned. Then I need the endpoints of the curve in order to find thecurves intersection with a Surface. The problem is that the start andend points returned from  and Curve.Evaluate are thesame points.What am I doing wrong? The start param is 0.0 and the end param is 6.3something, but the both return the same point when I use Evaluate. AmI getting the start and end points of the complete circle?Is there another way to get the arc to become a spline?Best regardsPål Eilertsen

Philippe Guglielmetti · Accepted Answer

oh, an API question... I take it! (but you should have put API in the subject)

2*pi perhaps ;-)

Exactly.

Curves have no endpoints. They are "infinite", mathematically defined curves. Edges (and sketch segments) are only segments of curves. Use Edge::GetCurveParams2 to obtain the parameters of the start/end points Then Evaluate will work, with some extra care...

I would use Curve::GetTessPts to obtain points with the desired tolerance and send it to spline.

The first idea is to use FeatureManager::MakeStyledCurves (equivalent of GUI "FitSpline" function), but it doens't work for a single segment!

Centerpoint Arc to Spline?

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