[vtkusers] Time - varying vector field

[Gerard Gorman]

I have been tricking with time varying stuff in vtk for a while - mostly 
for particle tracing. I have thought that is was a pity that the new vtk 
XML format, which even has support for multiple partitions, did not also 
add support for time. This poses a problem in terms of writing generic 
applications that work with time varying data as the applications has to 
be made aware of what files are in the time series, what order they are 
in time, etc. I am considering using HDF5 for this instead ( 
http://hdf.ncsa.uiuc.edu/HDF5/papers/prototypes/mesh/). But this then 
leads to the problem that I'd have to get my hands on a vtk reader for 
this (there is a hdf4 reader out there but I haven't found hdf5) - ok 
there is hdf5utils but if I'm going to start extracting instances of vtk 
objects out of this when I might as well have stuck with the vtk format 
in the first place. Even more on the down side, it worries me that the 
API mentioned above is version 0.9 suggesting it's only beta - though 
it's been around for a while.

I realise that this is only a small part of the problem with time 
varying visualisation but I think it's an important part when it comes 
to implementing anything that will work for ones own data and some third 
party who later tries to use your code for their data.

Anyhow, that's my rant over - I'm really interested to hear any comments 
on or off the list.

Cheers
g

Berk Geveci wrote:
> Currently, VTK has no direct support for time dependent fields.
> The pipeline does not recognize time as a fourth dimension.
> There are no filters to compute particle traces or streaklines
> in unsteady fields. You have to write your own filters to
> handle time dependence. The streamtracer filter was written
> with time in mind, however. It is possible to modify it to
> handle time and integrate particle traces. Streaklines can
> then be generated using the particle integrator.
> 
> -Berk
> 
> On Thu, 2003-10-09 at 09:54, Uwe Köhler wrote:
> 
>>-----BEGIN PGP SIGNED MESSAGE-----
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>>Hi,
>>
>>I am looking for the best way to store time-varying vector data in a VTK data 
>>structure. Has anyone got experience with that. So far, I only had to handle 
>>steady vector fields. How do a visualize particle traces, streaklines?
>>
>>Any help would be greately appreciated
>>
>>Uwe
>>
>>- -- 
>> |                                                                 |
>>- -+-----------------------------------------------------------------+-
>> |  Dr. Uwe Köhler                                                 |
>> |                              D - Berlin                         |
>> |          ////                Germany                            |
>> |         (@ @)                Phone: +49 172 98 11 598           |
>>- -+-----oOO--(_)--OOo-----------------------------------------------+-
>> | <URL:http://www.ed.ac.uk/~ukoehler>   <mailto:U.Koehler at gmx.de> |
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-- 
----------------------------------------------------------
Gerard Gorman (PhD Student)
Applied Modelling and Computation Group
Earth Science and Engineering
Imperial College
Prince Consort Road		Tel. 00 44 +207 594 9323
London SW7 2BP			Fax. 00 44 +207 594 9321
U.K.                    o~o A good slogan beats a good solution.
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