[Paraview] Visualize equdistant cell-centered data

[Stephen Wornom]

Always include the question that you are answering, 
Stephen 

----- Original Message -----

> From: "Cory Quammen" <cory.quammen at kitware.com>
> To: "Henrik Buesing" <hbuesing at eonerc.rwth-aachen.de>
> Cc: paraview at paraview.org
> Sent: Friday, February 9, 2018 3:20:13 PM
> Subject: Re: [Paraview] Visualize equdistant cell-centered data

> 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 | Tel +49 (0)241 80 49907
> 

> > 52074 Aachen, Germany | Fax +49 (0)241 80 49889
> 

> > 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 | Tel +49 (0)241 80 49907
> > 
> 

> > > 52074 Aachen, Germany | Fax +49 (0)241 80 49889
> > 
> 

> > > 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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> 

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> 

> > > Please keep messages on-topic and check the ParaView Wiki at:
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> > 
> 

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> 

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> > 
> 
> > --
> 

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

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

> _______________________________________________
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