[vtkusers] vtkTrivialProducer strange behavior

[Carlos Scheidegger]

Hi,

I'm trying to use vtkTrivialProducer in one application and I'm getting 
unexpected behavior. Apparently, there cannot be more than one 
vtkTrivialProducer pointing to the same vtkDataObject? I'm attaching a 
python script that exercises the path. This is what happens when I run it:

[cscheid at frodo]$ ./test_trivial_producer_crash.py 
/scratch/cscheid/data/VTKData/Data/fran_cut.vtk 1
vtk version 5.1.0, vtk source $Revision: 1.2266 $, $Date: 2005/11/17 
10:24:41 $ (GMT)
[cscheid at frodo]$ ./test_trivial_producer_crash.py 
/scratch/cscheid/data/VTKData/Data/fran_cut.vtk 2
vtk version 5.1.0, vtk source $Revision: 1.2266 $, $Date: 2005/11/17 
10:24:41 $ (GMT)
[cscheid at frodo]$ ./test_trivial_producer_crash.py 
/scratch/cscheid/data/VTKData/Data/fran_cut.vtk 1 producer
vtk version 5.1.0, vtk source $Revision: 1.2266 $, $Date: 2005/11/17 
10:24:41 $ (GMT)
[cscheid at frodo]$ ./test_trivial_producer_crash.py 
/scratch/cscheid/data/VTKData/Data/fran_cut.vtk 2 producer
vtk version 5.1.0, vtk source $Revision: 1.2266 $, $Date: 2005/11/17 
10:24:41 $ (GMT)
ERROR: In 
/scratch/cscheid/code/VTK/Filtering/vtkDemandDrivenPipeline.cxx, line 654
vtkStreamingDemandDrivenPipeline (0x81bb890): Algorithm 
vtkTrivialProducer(0x81bb298) did not create output for port 0 when 
asked by REQUEST_DATA_OBJECT and does not specify any DATA_TYPE_NAME.

ERROR: In 
/scratch/cscheid/code/VTK/Filtering/vtkDemandDrivenPipeline.cxx, line 654
vtkStreamingDemandDrivenPipeline (0x81bb890): Algorithm 
vtkTrivialProducer(0x81bb298) did not create output for port 0 when 
asked by REQUEST_DATA_OBJECT and does not specify any DATA_TYPE_NAME.

ERROR: In 
/scratch/cscheid/code/VTK/Filtering/vtkDemandDrivenPipeline.cxx, line 654
vtkStreamingDemandDrivenPipeline (0x81bb890): Algorithm 
vtkTrivialProducer(0x81bb298) did not create output for port 0 when 
asked by REQUEST_DATA_OBJECT and does not specify any DATA_TYPE_NAME.

Segmentation fault
[cscheid at frodo]$

The code will try to create two renderers and show the same dataset in 
both, using vtkTrivialProducers to feed the mapper. Is this the expected 
behavior? I can work around it, but I'm just wondering whether it's a 
bug or not. (I guess it's high time I learned some serious VTK internals)

Thank you in advance,
Carlos Scheidegger, on behalf of the VisTrails dev team


-------------- next part --------------
A non-text attachment was scrubbed...
Name: test_trivial_producer_crash.py
Type: text/x-python
Size: 1845 bytes
Desc: not available
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20060306/b137d9c7/attachment.py>