[vtkusers] Fixing vtkPolyDataToImageStencil

[David Gobbi]

I made a mistake in my last email, it should be "rightmost and topmost
pixels".

On Thu, Dec 4, 2014 at 9:32 AM, David Gobbi <david.gobbi at gmail.com> wrote:

> Hi Ricardo,
>
> Thanks for the feedback.  In the image that you attached, the pixels are
> twice as large as the "jaggies" of the contour, so I'm not sure how it
> would be possible for them to match exactly?
>
> That diagram for polygon scan conversion is an accurate depiction of what
> vtkPolyDataToImageStencil does if you call SetTolerance(0.0) and the
> contour passes exactly through the centre of a voxel.  If the tolerance is
> greater than zero, then leftmost and topmost pixels would also be included.
>
>  - David
>
>
> On Thu, Dec 4, 2014 at 9:17 AM, Ricardo A Corredor <ra.corredor at gmail.com>
> wrote:
>
>> 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
>>
>>
>>
>> --
>> View this message in context:
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>> Sent from the VTK - Users mailing list archive at Nabble.com.
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