[vtkusers] Store multiple versions of an array in a vtp file

[Eric E. Monson]

Hey David,

I think the easiest way would be to either write a separate vtp file  
for each iteration (and then write a pvd file to treat them as a time  
series for animating in ParaView), or else change your data file format.

I've never used it, but evidently the Ensight Gold format allows  
separate files for the mesh and the data associated with it. For my  
work I use XDMF (http://xdmf.org), which would allow you to write one  
copy of the geometry and the scalars for each iteration to a single  
HDF5 file, and then the XMF file that goes with it would describe a  
time series which points to the one copy of the geometry on each  
"time" step along with the new cluster array scalars.

Otherwise, as a long-shot, there was some talk on the ParaView mailing  
list last year saying that vtu files could actually hold multiple time  
steps, and that someone had patches which would allow pvd files to be  
read in using "shared" geometry, but I'm not sure what the status of  
that is...

http://www.vtk.org/pipermail/vtkusers/2008-February/094463.html

Good luck,
-Eric

------------------------------------------------------
Eric E Monson
Duke Visualization Technology Group


On May 3, 2009, at 6:09 PM, David Doria wrote:

> I have added a "ClassLabel" array to a polydata which stores, for  
> each point, which class/cluster the point is associated with  
> (integer values). I would like to track these class associations  
> over "time", that is, in each iteration of my clustering algorithm,  
> I would like to save the current class associations, the idea being  
> that I could watch the evolution of the clusters in paraview. It  
> seems silly to add a bunch of vectors (Association_1,  
> Association_2, ... Association_1000), and I don't think that would  
> be able to be animated anyway. Is there a way to do this without  
> having to write a separate vtp file for each one of these iterations  
> (as they would quickly fill the hard drive!)?
>
> Thanks,
>
> David
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