[CIG-SHORT] stress in vtk files

[Brad Aagaard]

I was assuming that Tabrez wants to create velocity time histories. 
Thorsten is right that the calculator makes it very easy to do some 
simple post-processing. It does not appear to be able to do looping over 
time steps for processing of a series of snapshots. I could be wrong and 
if someone knows how to create velocity time histories from displacement 
snapshots, it would be great to learn how to do it.

Brad

Thorsten Becker wrote:
> On Sat, 2008-05-17 at 11:39 -0700, Brad Aagaard wrote:
>> Tabrez Ali wrote:
>>> PyLith Users/Developers
>>>
>>> The vtk files containing stress results have six values for each 
>>> component but which is what?
>> Good question. I think this is missing from the manual.
>> The order for the stress and strain components is
>>
>> 1-D: sigma_xx
>>
>> 2-D: sigma_xx, sigma_yy, sigma_xy
>>
>> 3-D: sigma_xx, sigma_yy, sigma_zz, sigma_xy, sigma_yz, sigma_xz
>>
>> Brad
>>
>>
>>> Also is there a supereasy way "within" Paraview to obtain annual 
>>> velocities from displacement data available each year, say from 0-500 yrs.
> 
> I'm not sure if I understand the question, but Paraview has a calculator
> tool (Filter->Alphabetical->Calculator, in 3.2.1, for example) that can
> operate on all model scalars (including coordinates) and vectors (such
> as velocities). 
> 
> 
> 
>> I don't think there is an easy way. ParaView has a scripting interface 
>> but I have no experience using it. This is one reason why we want to add 
>> HDF5 output. It is very easy to write simple Matlab or Python scripts to 
>> process data in HDF5 files.
>>
>> Brad
>>
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>