[vtkusers] A simple VTK file format definition issue?

[David E DeMarle]

Are the last two polygons concave?
On Jun 30, 2012 5:58 AM, "Alex Southern" <mrapsouthern at gmail.com> wrote:

> Hi,
>
> Iver been looking at this for a couple of hours and I just cant find the
> probelm.
> What is wrong with this geometry definition?
>
> The last 2 polygons do not show up correctly, they produce the desired
> polygon plus some additional unwanted planes, that flicker as you rotate
> the model. The problem must be in this definition as it also occurs in
> Paraview.
>
> Any help, have i got the format wrong or something?
>
> Thanks
> A.
>
> # vtk DataFile Version 3.0
> my VTK file
> ASCII
> DATASET POLYDATA
> POINTS 16 float
> 4.000000 3.000000 3.000000
> 4.000000 0.000000 3.000000
> 4.000000 0.000000 0.000000
> 4.000000 3.000000 0.000000
> 6.000000 3.000000 0.000000
> 6.000000 7.000000 0.000000
> 6.000000 7.000000 3.000000
> 6.000000 3.000000 3.000000
> 3.000000 7.000000 0.000000
> 3.000000 7.000000 3.000000
> 3.000000 4.000000 0.000000
> 3.000000 4.000000 3.000000
> 0.000000 4.000000 0.000000
> 0.000000 4.000000 3.000000
> 0.000000 0.000000 0.000000
> 0.000000 0.000000 3.000000
> POLYGONS 10 58
> 4 0 1 2 3
> 4 4 5 6 7
> 4 5 8 9 6
> 4 8 10 11 9
> 4 10 12 13 11
> 4 12 14 15 13
> 4 15 14 2 1
> 4 0 3 4 7
> 8 4 3 2 14 12 10 8 5
> 8 6 9 11 13 15 1 0 7
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