Archived discussion

approximation of Geom_BSplineCurve

Other usage issuesThu, 08/03/2006 - 10:591 reply

QuestionAuthorThu, 08/03/2006 - 10:59

Hello,
I approximated a TopoDS_Edge successfully with the following code example.
BRepAdaptor_Curve edgeAdaptor(edge);
Handle(BRepAdaptor_HCurve) crv = new BRepAdaptor_HCurve(edgeAdaptor);
Approx_Curve3d approx(crv, tolerance, GeomAbs_C2, 1000, 3);
But is there any possibility to force the resulting curve to be nonrational, all weights to be 1.0?
Regards,
Author

Discussion

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01Commenter-1Fri, 08/18/2006 - 13:43

Hello Author,

If the curve is an ellipse or a cricle then there will be a rational BSpline, because this is an exact representation of the ellipse rsp. cricle.

I made the experience that "ShapeConstruct::ConvertCurveToBSpline" converts ellipses and cricles to nonrational BSplines (with many poles). I would prefere rational BSplines from circles, because they are exact (not approximated), but in your case this is maybe what you want.

best regards
Commenter-1