[Paraview] Gauss points

[Burlen Loring]

Hi Mario,

sending again to the list. the weights have 2 dimensions i (node id) and 
j (Gauss point id), so to generate ShapeFunctionWeights for a new 
QuadratureSchemeDefinition  what you do is evaluate each shape function 
at each Gauss point. For the linear quadrilateral you'll end up with 16 
weights. For example see the example

http://www.hpcvis.com/vis/images/vtk-quadrature-points-example/vtk-quadrature-points-example.pdf
http://www.hpcvis.com/vis/images/vtk-quadrature-points-example/quadrature-points-example.vtu

Burlen

On 11/29/2013 3:34 PM, Marios Mavros wrote:
> Hi Burlen,
>
> I want to thank you for the information that you send me. I read the 
> paper and I try to made a simple example in xml format for a 4 node 
> quadrilateral element but it didn't work for me. Attached you will 
> find the element formulation that I used with the shape functions and 
> a .vtu file with my example. If I want to give 4 stress values in the 
> 4 Gauss points ( lets say 0.1 0.2 0.4 -0.1) can you please write in 
> the .vtu file the missing information in order to understand haw I 
> have to write a correct file in xml format.
>
> Thank you very much
>
> Marios Mavros
>
>
> On Wed, Nov 27, 2013 at 2:56 PM, Burlen Loring <bloring at lbl.gov 
> <mailto:bloring at lbl.gov>> wrote:
>
>     You'll need to use an XML file format. There's some documentation
>     in the following link. It's slightly dated but should get you
>     started.
>     http://www.vtk.org/Wiki/images/7/78/VTK-Quadrature-Point-Design-Doc.pdf
>     The ctest,
>     VTK/Filters/General/Testing/Cxx/TestQuadraturePoints.cxx, could be
>     used as an example.
>
>
>     On 11/27/2013 02:32 PM, Marios Mavros wrote:
>>     Hi
>>
>>     I have wrote a simple program in Fortran that transform the
>>     output of a finite element software in vtk Legacy Format. I don't
>>     know how to handle the Gauss points values. For example in my
>>     case my cells have 4 Gauss points and I have 4 values (for
>>     example strain in x-direction) for each cell. How I have to write
>>     the vtk file taking into account that each cell has many Gauss
>>     points?
>>
>>     Thank you
>>
>>     Marios
>>
>>
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