[vtkusers] Fixing vtkPolyDataToImageStencil

[Ricardo A Corredor]

Hi David,

I didn't reply when you submit this change, but I confirm that it works well
!! Thanks

However, I still have a question. Please look the following image:

<http://vtk.1045678.n5.nabble.com/file/n5729677/PolydataToImage.jpg> 

There are some voxels inside the polydata that are not included in the final
mask. Is it a problem on the way they are calculated? Probably a shift when
considering the voxel inside the contour (something like what is shown here
http://guy-grave.developpez.com/tutoriels/hardware/les-cartes-graphiques/pipeline-non-programmable/rasterization/images/Polygon_scan-conversion.svg)? 

Thank you again and have a good day.


Ricardo
RaC



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