[Paraview] Fwd: Fwd: XDMF and Lookup Tables

[David E DeMarle]

Hi Dmitry,

What is wrong with the lookup tables that ParaView makes for you with the
xdmf file? Regardless of the file format, once ParaView opens the data it
just sees sets of arrays really and the GUI lets you create and assign
lookup tables.

The .vtk file format's ability to store a lookup table near the data values
is an anachronism in my opinion. I would be surprised if ParaView respects
it actually. Instead ParaView's approach is to treat the data as data and
give you ways to save off an restore lookup tables and other visualization
parameters independently of the data (state files for example).

cheers

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Sun, May 24, 2015 at 3:58 PM, Dmitry Grebennikov <dmitry.ew at gmail.com>
wrote:

>  Sorry for several messages in a row.
> Maybe you could also point me to another format which would support color
> lookup tables, time-steps with unchanged grid.
>
>
> -------- Forwarded Message --------  Subject: Fwd: XDMF and Lookup Tables  Date:
> Sun, 24 May 2015 22:27:06 +0300  From: Dmitry Grebennikov
> <dmitry.ew at gmail.com> <dmitry.ew at gmail.com>  To: paraview at paraview.org
>
>
> Or maybe there is a way to program such a filter, which would color the
> cells of the grid in a 'proper' way?
> Instead of usage of LUT and categorical colormaps...
>
>
> -------- Forwarded Message --------  Subject: XDMF and Lookup Tables  Date:
> Sun, 24 May 2015 22:05:44 +0300  From: Dmitry Grebennikov
> <dmitry.ew at gmail.com> <dmitry.ew at gmail.com>  To: paraview at paraview.org
>
> Hello!
> Could you please help me with the following problem:
>
> For my purposes I need to store unchanged Unstructured Grid across several
> time steps.
> At each time step the Scalars array for CellData is modified.
> I found out that if I can use the XDMF format in order not to have to
> write the same Grid at each time step into new .vtk file.
>
> But unfortunately it seems to be that in XDMF it is impossible to use
> Lookup Tables to color the Scalars array in the proper way to build the
> desired animation...
> Am I right or may be I missed this possibility?..
>
> I think also that I might try to use the manually specify color lookup
> table in Paraview using "Interpret Values as Categories" in Color Map
> Editor.
> It would be brilliant if it worked, but I also need to specify the alpha
> (transparency) for colors of categories, which seems to be unavailable
> feature...
>
> Could you please give me a hint on either 1) how to specify Lookup Tables
> when using XDMF or 2) how to add transparency for categorical colormaps in
> Paraview?
>
> Thanks in advance!
>
> Dmitry Grebennikov
>
>
>
>
>
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