[Paraview] [PV3-CVS] client x server with Ensight SOS

Moreland, Kenneth kmorel at sandia.gov
Wed Oct 10 16:55:35 EDT 2007

The culler is just doing an approximation of the visibility ordering.
In many cases, there is no ordering.  For example, one block may be a
shell over another block.  Another example is a block inserted into a
concavity of another block.  Such structures are common in assemblies.
When they occur, it is incorrect to render one before the other.  The
result is quite misleading.


> -----Original Message-----
> From: Jean Favre [mailto:jfavre at cscs.ch]
> Sent: Wednesday, October 10, 2007 2:10 PM
> To: Moreland, Kenneth
> Cc: Rick Angelini(CISD/CIV); rnelias; paraview at paraview.org
> Subject: RE: [Paraview] [PV3-CVS] client x server with Ensight SOS
> On 10, Oct 2007 09:02 PM, "Moreland, Kenneth" <kmorel at sandia.gov>
> >Unless something has changed while I wasn't looking, volume rendering
> >is
> >not supported with multiblock data. The issue with multiblock data is
> >that there probably is not a correct "visibility" order in which to
> >render the pieces.
> >
> The way I do it in my VTK app for multi-block vol rendering is to get
> the vtkCullerCollection from the Renderer, and then use
> vtkFrustumCoverageCuller *culler = (vtkFrustumCoverageCuller
> *)collection->GetNextItem();
> culler->SetSortingStyleToBackToFront();
> --Jean

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