Z axis direction of a Cplane?

@Cyver wrote:

Hi all,
i need to determine in wich direction is oriented my cplanes Z axis

For example, i set a cplane on planar curves with Rhino.curvePlane.
on pictures we have 2 similar curves, but one put the Cplane Zaxis upside the other.

in script, arrPlane (3) return the Z axis, but i got a vector value, with 3 index, sometimes positive or negatives value depending of curves placement.

How can i determine the direction of my axis with these values ?

or may be another solution ?

Thanks.

Call Main()
Sub Main()
	Dim strCrv, arrPlane
	strCrv = rhino.getObject("Curve", 4)
	
	arrPlane = Rhino.CurvePlane(strCrv)
	
	Rhino.ViewCplane, arrPlane

End Sub

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