CurvePlane() Bug?

[noclew]

Hi people,

Now I am trying to extract a curve plane using CurvePlane() method.
However, this function always returns None value when it come to the certain curve, which is actually planar polyline. (and when I check planarity of this curve using isCurvePlanar(), the result says the curve is not planar, although it is)
I spent a lot of time to figure out why with no luck..


It will be really appreciated if you can give me some help!
I simplified the code and also attach the curve that has a problem with CurvePlane().

Thank you!

import rhinoscriptsyntax as rs
curve = rs.GetObject("Select a curve", rs.filter.curve)
plane = rs.CurvePlane(curve)
print(plane)

[Mitch]

This is not really a problem with Python - it's just that for some reason Rhino thinks the curve is not planar - it may be out at some molecular level... or there is a bug somewhere. If IsCurvePlanar fails, then Rhino doesn't think it's planar and CurvePlane will return None, which is normal if you feed it a non planar curve.

--Mitch

[noclew]

Thank Mtch,

I agree. Looking into the curvePlane method, I found that isCurvePlanar does not work on some curves even though they are valid planar geometry. It is strange that if I manipulate erroneous curves using closeCurve or exploding and joining them in different manners, curvePlane starts to work. I will see if I can found a way to circumvent this problem. It seems there some bugs... Thank for you comment Mitch!