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

Mon, 18 Aug 2008 13:13:22 -0700 

OK, the reader now produces uniform grids for temporal collections.
I'm still testing but I've checked in the new version.
Please give it a try on a variety of cases.

Thanks
Jerry


John Biddiscombe wrote:
Further to my email the other day. Putting the commented line back in, did 'appear' to fix my temporal problem, but on closer inspection, although the time steps were correct, the data inside them was missing. Inspector showed no cells, points etc.
I reverted my own copy back a couple of revisions so that I could work with my own data. I await further developments, but am available (this week) for help/testing if need be 

cheers

JB


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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of John Biddiscombe
Sent: Thursday, August 14, 2008 2:40 PM
To: Eric E. Monson
Cc: Renato N. Elias; [EMAIL PROTECTED]; 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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