[Paraview] Quadric Clustering on 3D Unstructured Grid (PV3.2)

[Claudio Silva]

Hi!

We have developed a vtkUnstructuredGridQuadricDecimation filter that  
simplifies 3-D unstructured grids. It implements a non-streamable  
version of the algorithm described in "Streaming Simplification for  
Tetrahedral Meshes Grids", H. Vo, S. Callahan, P. Lindstrom, V.  
Pascucci, and C. Silva, IEEE Transactions on Visualization and  
Computer Graphics, 13(1):145-155, 2007.

We would be happy to contribute this code to VTK, if people find it  
useful. We have been using it "in house" at Utah for 2 years now, and  
it has been quite stable.

In the meantime, I can simply send a copy to whoever wants it. Please  
let me know.

Claudio.



On Nov 14, 2007, at 12:23 AM, Sylvester Gerardson wrote:

> Randall and Simone,
>
> Thank you both for your help. Too bad it can't be done though...
>
> Sylvester
>
> From: Randall Hand [mailto:randall.hand at gmail.com]
> Sent: Wednesday, November 14, 2007 3:23 AM
> To: Simone Crippa
> Cc: Sylvester Gerardson; paraview at paraview.org
> Subject: Re: [Paraview] Quadric Clustering on 3D Unstructured Grid  
> (PV3.2)
>
> Quadric Clustering only applies to Polygonal datasets.  Volumetric  
> Datasets cannot be decimated via the Quadric Clustering algorithm.   
> Using the Extract Surface simply extracts a polygonal outer surface  
> from your volume which is why you're then able to use it.
>
>
> On Nov 13, 2007 8:10 AM, Simone Crippa <crippa at kth.se> wrote:
> Hi,
>
> OK, sorry I misread your post ... I obviously thought that you want to
> apply quadric clustering on a boundary grid.
> I hope somebody else can help you out on how to do it for a volume
> dataset, as I also didn't manage so far with it!
>
>
> /Simone
>
>
>
> Sylvester Gerardson wrote:
> > Hi Simone,
> >
> > Thank you for your answer.
> >
> > I am not sure I understand your suggestion. When I apply the  
> 'Extract
> > Surface' filter only my (3D) surfaces remain and the Quadric
> > Clustering filter becomes available.
> >
> > But I need the volume cells, not the surfaces. Am I doing  
> something wrong?
> >
> > regards,
> > Sylvester
> >
> >
> > On 11/13/07, Simone Crippa <crippa at kth.se> wrote:
> >> Hi,
> >>
> >> the way I do it is to extract first the surface of the  
> unstructured grid
> >> (vtkDataSetSurfaceFilter), then it is possible to use quadric  
> clustering.
> >>
> >>
> >> /Simone
> >>
> >>
> >>
> >>
> >> Sylvester Gerardson wrote:
> >>> Hi All,
> >>>
> >>> How do I apply the Quadric Clustering filter to a 3D  
> Unstructured Grid? (it
> >>> is greyed out in the menu) Or is there another way to coarsen  
> the mesh?
> >>> I've used it with great success on 2D cutplanes.
> >>>
> >>> A bit of coding and compiling is not a problem for me.
> >>>
> >>> Thank you.
> >>>
> >>> Sylvester
> >>>
> >>> _______________________________________________
> >>> ParaView mailing list
> >>> ParaView at paraview.org
> >>> http://www.paraview.org/mailman/listinfo/paraview
> >>
> >> --
> >> Simone Crippa
> >> Research assistant, Dipl.-Ing.
> >> Royal Institute of Technology (KTH)
> >> Aeronautical and Vehicle Engineering
> >> Division of Aerodynamics
> >> Teknikringen 8
> >> SE-10044 Stockholm, Sweden
> >> +46 (0)8 790 6465
> >>
>
>
> --
> Simone Crippa
> Research assistant, Dipl.-Ing.
> Royal Institute of Technology (KTH)
> Aeronautical and Vehicle Engineering
> Division of Aerodynamics
> Teknikringen 8
> SE-10044 Stockholm, Sweden
> +46 (0)8 790 6465
> _______________________________________________
> ParaView mailing list
> ParaView at paraview.org
> http://www.paraview.org/mailman/listinfo/paraview
>
>
>
> -- 
> ----------------------------------------
> Randall Hand
> Visualization Scientist
> ERDC MSRC-ITL
> _______________________________________________
> ParaView mailing list
> ParaView at paraview.org
> http://www.paraview.org/mailman/listinfo/paraview

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