[vtkusers] Strange vtkPolygon behavior

[Frese Daniel Dr.]

Hi David,

To be honest I did not check your code very carefully, but from what you write, I had once a similar problem with some concave poly data. Googling I found some older threads reporting similar issues of incorrect displaying some concave poly data. They recommended to apply a vtkTriangleFilter before sending the data to the mapper, and in my case that did the trick.

Hope this helps,
Daniel

Von: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] Im Auftrag von David Doria
Gesendet: Mittwoch, 13. Juli 2011 20:50
An: vtkusers at vtk.org
Betreff: [vtkusers] Strange vtkPolygon behavior

The following code creates a contour, and then attempts to create a polygon on the same points to "fill in" the contour:
http://codepad.org/OxnvsZe6

The contour looks as expected in Paraview, but the polygon is broken (there are overlapping triangles, etc). I also tried adding the points in the reverse order (as you can see in PolygonFromContourClockwise vs PolygonFromContourCounterClockwise), but that doesn't seem to be the problem.

The last point is not repeated (as per the documentation's requirement) and there are no self intersections.

Can anyone see where I am going wrong?

Thanks,

David
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