[Paraview] Paraview hangs when using changing geometries and binary ensight gold format

[Georg Hammerl]

Hello again,

In the meantime I have found the problem with the binary ensight gold 
reader.

Whenever the variable-files are read for a time steps greater than 1, 
Paraview has to jump in the binary file to the desired timestep. This is 
done by partially parsing and skipping blocks until the correct "BEGIN 
TIME STEP" is found. In order to skip the correct block length, Paraview 
uses the number of points (numPts) from the current geometry step. This 
breaks with a varying number of points per timestep.
As an example my first step contains 2 points and the second step 6 
points, therefore when Paraview skips the first time step, it skips a 
block length equivalent to 6 points. The correct number would be 2 
points. It therefore skips past the next "BEGIN TIME STEP".

In order to verify my theory I have implemented a little hack which 
looks for the next "BEGIN TIME STEP" by brute force. In case someone 
wants to try this I have attached a patch which can be used in 
conjunction with the examples in my previous mail.

A clean solution would be to skip the correct number of points for every 
given timestep. Unfortunately I do not have enough insight into the 
Paraview/VTK ensight reader to implement this and would appreciate any 
help in finding a clean solution to this.

Cheers,

Georg


On 27/02/13 08:17, Georg Hammerl wrote:
> Hello,
>
> I have problems when I try to visualize my results in Paraview which 
> include changing geometries. I can load the first time step but when I 
> switch to the next step (in which 4 points are added), paraview 
> freezes and htop shows 100% load for this process. Surprisingly, this 
> only happens when I use binary ensight gold format. The same results 
> written in ascii ensight gold format work. The ens_checker tells me 
> for both cases that I have valid output files. Attached are the binary 
> and ascii version of the result. It would be nice to use binary output 
> for my results.
>
> I work on a 64 bit Linux system and I have checked out the latest 
> repository version of Paraview (but I have also tried older versions: 
> 3.14 and 3.6) giving me the same result.
>
> Thanks in advance for your help.
>
> Cheers,
>
> Georg
>
>
>
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-- 
Dipl.-Ing. Georg Hammerl
Lehrstuhl für Numerische Mechanik
Technische Universität München
Boltzmannstrasse 15, D-85747 Garching b. München
phone +49 89 289 15237
fax +49 89 289 15301
hammerl at lnm.mw.tum.de
http://www.lnm.mw.tum.de

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