Eric et al,
I recently had a problem where a filter opreated normally when used
normally, but when someone put a calculator in front of it, it stopped
working. The filter in question instantiated other filters internally.
I tracked to the problem down to this.
Calculator calls SetActiveScalars(New data)
another filter later does a PointData()->PassData(blah)
->SetActiveScalars(More New data)
And the New data from before was lost. I do not like this
SetActiveScalars function because it replaces (not adds) whatever scalar
was there before. I cnaged the offending filter (in this case
vtkSurfaceVectors) on my copy to do
PointData()->PassData(blah)
PointData()->AddArray(newData);
PointData()->SetActiveScalars(newData->GetName())
or something like that (from memory).
I have no idea if this is related to your problem, but I just thought
I'd vent my spleen and start a campaigh to remove this
SetActiveScalars(...) call as it is just rubbish. (At least it should be
modified internally to not remove the old active slalars if they are are
about to be wiped)
JB
Hey Utkarsh,
No, I've never seen the clip lose data on one dataset by itself.
The other interesting thing is that I can't always get this data loss
to happen if the data was generated as part of a source from the
Sources menu. It's much more likely to disappear when the data was
generated by a filter or brought in by a reader.
For example, if you generate a Box and a Wavelet source, grouping and
clipping them won't lose any data, but if you run Generate IDs on one
of them, then select GenerateIds1 second before grouping, then clip,
the "Ids" point data disappears...
Thanks,
-Eric
On Feb 6, 2009, at 7:37 AM, Utkarsh Ayachit wrote:
Eric,
Does the loss of arrays happen even if you clip the orginal dataset by
itself (without grouping it using the group filter)?
Utkarsh
On Wed, Feb 4, 2009 at 3:53 PM, Eric E. Monson <[email protected]>
wrote:
Hello,
I'm creating a multi-block data set using the group filter and then
clipping
it. The results of the clip are always missing one of the scalars
associated
with the second data set that I highlighted before applying the group
filter. This only seems to happen if one of the data sets has multiple
scalars or vectors associated with it -- if they each only have one,
nothing
is lost in the clip. (ParaView 3.4 and CVS, OS X 10.5.6 and Windows XP
32-bit, no MPI)
I originally saw this with my own data, but I am able to easily
replicate
this by creating two point sources. I apply the Elevation filter to the
first. Then, to the second I apply Brownian Vectors, plus a
Calculator that
computes the magnitude of those vectors. If I highlight Elevation
and then
Calculator, then Group and Clip, I lose the vector magnitude scalar
at the
Clip stage. If I highlight the Calculator and then the Elevation,
then Group
and Clip, I lose the elevation scalar.
Please let me know if anyone has any ideas about where this could be
coming
from.
Thanks a lot,
-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
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