[Paraview] Losing data when clip multi-block

Tue Feb 10 15:48:00 EST 2009

Thanks a lot, Alan. This was driving me nuts that nobody could  
reproduce it! :)

For now I wish I could predict which variable was going to be lost so  
I could at least create a sacrificial array that could disappear and  
leave my real data intact.

I also wish I knew the difference in Berk's build that won't reproduce  
my first example since I still see the data loss on today's CVS. I'm  
trying an MPI build in case there would be a difference in how multi- 
block data sets are handled, but I know that's probably grasping at  
straws...

Anyway, thanks for filing the bug and I'll take a look at it later to  
see if I can add anything.

Talk to you later,
-Eric

On Feb 10, 2009, at 3:33 PM, Scott, W Alan wrote:

> Eric,
> Sorry for taking time to get back to you - I wanted to verify with  
> the developers that this isn't expected behavior.  You have  
> correctly found a bug.
>
> I wrote this up as bug number 8494 in the Kitware bug tracker.  I  
> used your very simple, excellent Point and Sphere source example  
> listed below.  If I missed anything, please feel free to modify the  
> bug appropriately.
>
> Alan
>
> -----Original Message-----
> From: Berk Geveci [mailto:berk.geveci at kitware.com]
> Sent: Tuesday, February 10, 2009 10:59 AM
> To: Eric E. Monson
> Cc: Scott, W Alan; ParaView List
> Subject: Re: [Paraview] Losing data when clip multi-block
>
> Eric,
>
> I think we dealt with this problem since 3.4. I can't reproduce the  
> problem with your first set of instructions on cvs head. Do you mind  
> trying the cvs version?
>
> -berk
>
> On Fri, Feb 6, 2009 at 2:57 PM, Eric E. Monson <emonson at cs.duke.edu>  
> wrote:
>> Hey Alan,
>>
>> Are you seeing both the point and cell Ids arrays? When I do this I
>> end up with only the cell Ids array -- the points one is missing.
>>
>> Here's another one that loses a data array consistently:
>>
>> Create a Point Source (100 pts, 10 radius) Apply Elevation filter to
>> points Create a Sphere Source Apply Curvature filter to sphere Select
>> Elevation then Curvature Group Clip Gauss_Curvature is missing in  
>> Clip
>> Information (only see Elevation &
>> Normals)
>> (or, after deleting clip and group filters) Select Curvature then
>> Elevation Group Clip Elevation is missing in Clip Information (only
>> see Gauss_Curvature &
>> Normals)
>>
>> Any luck with that one? (I'd just like to hear that someone can
>> reproduce the problem before I file a bug report...)
>>
>> Thanks,
>> -Eric
>>
>>
>> On Feb 6, 2009, at 1:47 PM, Scott, W Alan wrote:
>>
>>> Eric,
>>> I was trying to replicate this bug, and cannot.   Please give me  
>>> detailed
>>> instructions on how to replicate it, and I will put it in the bug  
>>> tracker.
>>> Better yet would be you putting it in the bug tracker.
>>>
>>> I tried:
>>> ParaView CVS trunk from late January, XP, non client/server.
>>> Source/Box
>>> Source/Wavelet
>>> (Highlight Box) Filters/ Generate Ids (Highlight GenerateId and
>>> Wavelet) Filters/ Group Datasets Clip I then see the Ids points data
>>> as follows: Ids (partial)
>>>
>>> alan
>>>
>>> -----Original Message-----
>>> From: paraview-bounces at paraview.org
>>> [mailto:paraview-bounces at paraview.org]
>>> On Behalf Of Eric E. Monson
>>> Sent: Friday, February 06, 2009 7:09 AM
>>> To: ParaView List
>>> Subject: Re: [Paraview] Losing data when clip multi-block
>>>
>>> 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  
>>>> <emonson at cs.duke.edu>
>>>> 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
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> ParaView mailing list
>>>>> ParaView at paraview.org
>>>>> http://www.paraview.org/mailman/listinfo/paraview
>>>>>
>>>
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