[vtkusers] Solid Voxelization with VTK

[David Gobbi]

Hi Berti,

It's nice to see that the orientation voting gives such a clean result.  To
get a result without gaps it would be necessary to take a completely
different approach to the rasterization: rasterize the polygons themselves,
instead of rasterizing the volume enclosed by the polygons.

Neither of the filters is parallel.  I designed them both so that they
could be parallel, but I never wrote the threading code because they
already worked fast enough for my application.

For instance, vtkPolyDataToImageStencil has this method:

    void vtkPolyDataToImageStencil::ThreadedExecute(
      vtkImageStencilData *data,
      int extent[6],
      int threadId)

The vtkImageStencilData object is made so that it can be written and read
in a thread-safe manner, so in order to multithread this filter, one would
just have to subdivide the extent along Z and then write a threaded "For()"
loop, e.g. with vtkSMPTools.h.

 - David
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