same_nurbs compared the weights of a face's NURBS form and the rebuilt
analytic surface's NURBS within an absolute 1e-12. A weight is found from
the control points, so its rounding grows with the coordinates: 3.8e-12 at
coordinates of about 320 on a cone. The face was refused with "a NURBS form
that is not its analytic surface". Weights now compare within
1e-12 * max(1, |coordinates|), as same_nurbs_curve already does for points.
Andrzej Błasik
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