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

[Sylvester Gerardson]

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
>>>
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<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
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-- 
----------------------------------------
Randall Hand 
Visualization Scientist
ERDC MSRC-ITL 
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