JoinCurves equivalent for PolyCurve, c#

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Permalink Reply by David Rutten on February 28, 2014 at 10:44am

Curve.JoinCurves()

It takes an enumeration of curves, be they polycurves or not. If you already have a polycurve, you can use PolyCurve.Append().

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David Rutten

david@mcneel.com

Permalink Reply by Tree on February 28, 2014 at 11:15am

Thanks David,

This makes sense - I thought the following code would work but it is producing cast errors.

PolyCurve[] temp = Curve.JoinCurve(brepFaces[i].DuplicateEdgeCurves(true));

Is there a method to cast Curves to PolyCurves so that they can be joined?

Alternatively if there was an explode method for Curve I could use that and not need to touch the PolyCurve class.

Permalink Reply by David Rutten on February 28, 2014 at 2:30pm

You cannot cast curves to polycurves because they might not be polycurves. Casting isn't the same as converting. You cast data when you know it is of a specific type but the variable it's currently stored under is of a different (but not conflicting) type.

Curve.JoinCurves() returns an array of curves, not an array of polycurves. So if you use:

Curve[] temp = Curve.JoinCurve(brepFaces[i].DuplicateEdgeCurves(true));

It will work.

Why do you need polycurves specifically?

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David Rutten

david@mcneel.com