[Paraview] [Xdmf] Xdmf time series loads as Multi-block Dataset (UNCLASSIFIED)

[Clarke, Jerry (Civ, ARL/CISD)]

Classification:  UNCLASSIFIED 
Caveats: NONE

All,

I was out all of last week so I'm in catch up mode ....

I was making significant changes to the XDMF reader and they are not
finished yet. I checked in the changes that made the spatial collection
of temporal collections work. The issue was that the reader was assuming
that a temporal collection was at the first level (which may be the most
common case).

As I recall (it will take me a few hours to get back into the code) the 
changes that I made now treat spatial and temporal collections similarly
no matter the level. There's an internal flag to mark the temporal
collections.
That's why there is a big multiblock dataset for temporal collections.

The code to now make the output of a temporal collection the same type
as the children (and not a multiblock) is not yet working. Hopefully I
can get back to it today after fighting some other fires.

The main problem I was dealing with (other than the above temporal
collection
multiblock issue) was getting the reader to work correctly in parallel
when
the collection was not at the top level, i.e. not duplicating reads.

Jerry Clarke
 

-----Original Message-----
From: xdmf-bounces at lists.kitware.com
[mailto:xdmf-bounces at lists.kitware.com] On Behalf Of John Biddiscombe
Sent: Thursday, August 14, 2008 2:40 PM
To: Eric E. Monson
Cc: Renato N. Elias; xdmf at lists.kitware.com; ParaView List
Subject: Re: [Xdmf] Xdmf time series loads as Multi-block Dataset

at 1390 of xdmf reader
        // we will not output a TemporalDataset, but use this as a flag
for later
        // Jerry Change Me
        sub->vtkType = VTK_TEMPORAL_DATA_SET; the sub->vtkType line was
commented out. Putting it back in fixes my problem, but could Renato
send me a small example of (or link to) his grid of spatial/temporal
mixmatch combination stuff so I can test the other kind. If large, email
me off lists for ftp info.

thanks

JB



	Eric
	
	I just tried xdmf for the first time in a couple of weeks an
yes. It's 
	completely stuffed. I get a multiblock dataset with 800 blocks,
each 
	being one timestep - instead of a single (or possibly
multi-block) 
	dataset with time varying stuff.
	
	I Can see looking at Jerry's changes on immediate probable
cause, but 
	I'd better read through the email he sent a few days/week back
and 
	review the changes. I see what Jerry has tried to do - create a 
	multiblock xdmf structure and just fetch the correct grid when
you 
	request a timestep - thus giving us what we want. But there's a
flaw in 
	the logic when the actual output dataset is generated - so that
it 
	creates a multiblock one instead of the type givenm by the Nth
(=time) 
	dataset inside it when we are fetching a time step which is not
composite.
	
	I need this to work, so I'll be looking at it soon. Ig Jerry
reads this 
	before I fix it, then feel free to step in with the correct
patch :)
	
	JB
	  

		Hey all,
		
		Maybe I'm behind on my Xdmf XML format again, but my
files that a  
		month or two ago loaded a time series of unstructured
grids now loads  
		into ParaView CVS as a Multi-block Dataset with one
block for each  
		time step at each time point.
		
		Let's say I have 1200 Polyvertex time steps in my file.
I can (slowly)  
		step through the animation of my grid, but at each time
point the  
		progress bar is cycling through a bunch of work, and
each time point  
		lists (in the Information tab Data Hierarchy pane) a
Multi-block  
		Dataset made up of 1200 Unstructured Grids. Clicking on
each of these  
		blocks reveals that only the "current" time step block
has Data Arrays  
		associated with the grid. So, at each time step of the
animation, the  
		process seems very slow because 1200 blocks are being
loaded, only one  
		of which actually has real data in it. (The Time pane at
the bottom of  
		the Information tab always lists the correct time
indices and values  
		for the whole series.)
		
		Maybe this is just a change in the way time series are
dealt with, but  
		it is much slower with my data sets, and it made more
sense to me to  
		have each time step able to be represented as a simple
grid, if  
		desired. (I have been using a self-modified
vtkXdmfReader.cxx file for  
		a while, so I'm not sure when this multi-block issue
would have  
		appeared.)
		
		Thanks,
		-Eric
		
		------------------------------------------------------
		Eric E Monson
		Duke Visualization Technology Group
		
		
		
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-- 
John Biddiscombe,                            email:biddisco @ cscs.ch
http://www.cscs.ch/
CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82
Classification:  UNCLASSIFIED 
Caveats: NONE