[vtkusers] vtkMarchingCubes->vtkSmoothPolyDataFilter->vtkCurvatures

[Bill Lorensen]

Don't generate the normals unless you are decimating and/or smoothing.
Marching Cubes computes normals from the gradient of the grayscale
data. The Poly data normals will generate curvature artifacts...


On Mon, Jun 21, 2010 at 3:17 PM, Liam Kurmos
<quantum.leaf at googlemail.com> wrote:
> On Mon, Jun 21, 2010 at 7:44 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>> Try without PolyDataNormals and Smoothing. I think the artifacts are
>> not Marching Cubes related.
>
> Hi Bill,
>
> The png file called noSmoothing.png is produced without using the
> smoothing filter (i think the normals go straight in to the mapper -
> dont have code on me at moment). I think i put the normals in based on
> some example i originally copied, i will try playing with not using
> them later and post back, though i dont know what else could be
> causing those contour like lines (the voxel resolution is not high i
> think 64cube for the whole dataset).
>
> cheers,
>
> Liam
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
>