[Paraview] Visualize equdistant cell-centered data

[Cory Quammen]

On Fri, Feb 9, 2018 at 2:42 AM, Buesing, Henrik <
hbuesing at eonerc.rwth-aachen.de> wrote:

> Dear Cory,
>
>
>
> Thank you very much for your reply! I think, then I will build the new
> grid in my application already. With this I do not need to go through
> complicated post-processing steps.
>
> Thank you!
> Henrik
>
>
>
Henrik,

Thank seems like a reasonable solution :-)

Cory


>
>
> --
>
> Dipl.-Math. Henrik Büsing
>
> Institute for Applied Geophysics and Geothermal Energy
>
> E.ON Energy Research Center
>
> RWTH Aachen University
>
>
>
> Mathieustr. 10
> <https://maps.google.com/?q=Mathieustr.+10&entry=gmail&source=g>        |
> Tel +49 (0)241 80 49907 <+49%20241%208049907>
>
> 52074 Aachen, Germany | Fax +49 (0)241 80 49889 <+49%20241%208049889>
>
>
>
> http://www.eonerc.rwth-aachen.de/GGE
>
> hbuesing at eonerc.rwth-aachen.de
>
>
>
> *Von:* Cory Quammen [mailto:cory.quammen at kitware.com]
> *Gesendet:* Donnerstag, 8. Februar 2018 16:12
> *An:* Buesing, Henrik <hbuesing at eonerc.rwth-aachen.de>
> *Cc:* paraview at paraview.org
> *Betreff:* Re: [Paraview] Visualize equdistant cell-centered data
>
>
>
> Henrik,
>
>
>
> I believe I understand what you are trying to do. However, there is
> nothing available in ParaView to do this simply.
>
>
>
> You could use the Programmable Filter to create a new structured grid with
> the C+1 number of points in each dimension and then set the point data
> array in the C-sized grid to be a cell data array in the (C+1)-sized grid.
> The data layout is such that that should work. However, you will need to
> set up the points manually.
>
>
>
> Hope that helps,
>
> Cory
>
>
>
> On Thu, Feb 8, 2018 at 5:42 AM, Buesing, Henrik <
> hbuesing at eonerc.rwth-aachen.de> wrote:
>
> Ok. Let me rephrase my question. Maybe someone speaks Matlab? Full Matlab
> Code below (see [1]).
>
>
>
> Let’s assume I have a 2x2 matrix with color values C=[1 2; 3 4]. Now I can
> visualize this matrix with on a 2x2 grid with surf in Matlab. What I get is
> one square with the color values on each node (see Case 1 in the Matlab
> code). This is what Paraview does!
>
>
>
> What I want is the following: I define a new grid, which is 3x3. So one
> value more in each direction than I have color values. On this grid the
> color values live cell-centered. If I now visualize this in Matlab, I get a
> 2x2 block matrix with color values from 1-4. This is what I want!
>
>
>
> To sum up: I want to keep my color values, but I want to define a new
> cell-centered grid (with size(C,1)+1) where these color values live on. Is
> this somehow possible in Paraview?
>
> Thank you!
> Henrik
>
>
>
>
>
>
>
> [1]
>
>
>
> % Full Matlab Code to visualize the two cases.
>
>
>
> C = [1 2; 3 4];
>
>
>
> % Case 1
>
> x=linspace(0,1,size(C,1));
>
> y=x;
>
> [X,Y]=meshgrid(x,y);
>
> Z=zeros(size(C));
>
> figure;surf(X,Y,Z,C);shading interp;view(0,90);
>
> colorbar
>
>
>
> % Case 2
>
> x=linspace(0,1,size(C,1)+1);
>
> y=x;
>
> [X,Y]=meshgrid(x,y);
>
> Z=zeros(size(C)+1);
>
> figure;surf(X,Y,Z,C);shading flat;view(0,90);
>
> colorbar
>
>
>
> --
>
> Dipl.-Math. Henrik Büsing
>
> Institute for Applied Geophysics and Geothermal Energy
>
> E.ON Energy Research Center
>
> RWTH Aachen University
>
>
>
> Mathieustr. 10
> <https://maps.google.com/?q=Mathieustr.+10&entry=gmail&source=g>        |
> Tel +49 (0)241 80 49907 <+49%20241%208049907>
>
> 52074 Aachen, Germany | Fax +49 (0)241 80 49889 <+49%20241%208049889>
>
>
>
> http://www.eonerc.rwth-aachen.de/GGE
>
> hbuesing at eonerc.rwth-aachen.de
>
>
>
> *Von:* ParaView [mailto:paraview-bounces at paraview.org] *Im Auftrag von *Buesing,
> Henrik
> *Gesendet:* Freitag, 19. Januar 2018 21:13
> *An:* paraview at paraview.org
> *Betreff:* [Paraview] Visualize equdistant cell-centered data
>
>
>
> Dear all,
>
>
>
> I have a “Structured (Curvilinear) Grid” (*.vts), which gets read in as
> 314531 cells and 330000 points. I would like to tell Paraview that this is
> equidistant cell-centered data (330000 cells). I want every cell to get one
> color, such that color interpolation becomes correct.
>
>
>
> Can I somehow convert the data I have?
>
>
>
> Thank you!
> Henrik Büsing
>
>
>
>
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>
>
> --
>
> Cory Quammen
> Staff R&D Engineer
> Kitware, Inc.
>



-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.
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