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Subject: Error in nurbs01 test
Lofton, There is an error in the nurbs01 test in the test suite. It appears that the interpreter/viewer used to generate the reference PNG image ignored the weights in the NURBS element. To illustrate my point, I've generated an equivalent file (without the boilerplate text labels) containing a NUBS element which is unweighted by definition. The knot vector is identical to the nurbs01 test, and I've placed the control points at metrically equivalent positions in VDC space. This file views identically to the NURBS element in the NURBS01.cgm file as depicted in the PNG image. Applying weights to the spline should significantly alter the shape of the curve. You could do an equivalent test by using your convert program to remove the weights in the NURBS element (i.e. set them all to 1.0) in the NURBS01.cgm file. You will see similar results. Regards, Rob <<NUBS01_rob.cgm>>
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