[vtkusers] Time - varying vector field

[Berk Geveci]

I understand your pain and don't worry help is coming :-)
We have plans to add time support to at least the XML readers.
We have already started prototyping ideas in ParaView. 
Currently, time is partially supported in ParaView's
"pvd" file format. This consists of an XML based meta-file
pointing to regular VTK data files. The readers has methods
for selecting datasets based on a list of attributes (for example,
time) specified in the meta-file. It is also possible to
suppport things like multi-block and AMR datasets in this
format. We have more work to do before this can be put in
VTK.

-Berk

On Fri, 2003-10-10 at 04:02, Gerard Gorman wrote:
> 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-----
> >>Hash: SHA1
> >>
> >>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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> >>
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