If you pass three or more colinear points or points in the same location to Plane.FitPlaneToPoints the FitPlaneResult shows “Success”. Shouldn’t that be “Inconclusive” instead?
from Rhino.Geometry import Plane, Point3d
pts = [Point3d(0,0,0),
Point3d(1,1,1),
Point3d(2,2,2)]
fitResult, plane = Plane.FitPlaneToPoints(pts)
print(fitResult)
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