The same thing happens with the vtkImageConstantPad filter.
I wrote a GUI and ServerManager xml file and added the plugin to
paraview. The output outline is shown correctly, but the extent and
dimensions displayed in the Information tab are incorrect -> they are
are the same as for the input image, even though I set a larger output
extent in the vtkImageConstantPad filter.
Additionally, the data array looses it's name (I think this happens
with all image filters, which is not compatible with paraview as far
as I can tell).
Has any body got a solution or any advice? Thanks!
--Bryn
On Mar 9, 2009, at 12:36 PM, Bryn Lloyd wrote:
Another problem I get with the "partial solution" of setting the
update extent in the output, is that the update extent is sent
through the pipeline to the input. But it is too big for the input:
ERROR: In /Users/brynlloyd/pack/ParaView-CVS/VTK/Filtering/
vtkStreamingDemandDrivenPipeline.cxx, line 818
vtkCompositeDataPipeline (0x2183b5b0): The update extent specified
in the information for output port 0 on algorithm
vtkImageDataSource(0x2183b670) is 0 11 0 11 0 11, which is outside
the whole extent 0 9 0 9 0 9.
On Mar 9, 2009, at 12:27 PM, Bryn Lloyd wrote:
Hi,
I have been having trouble with writing image filter plugins. If
the extent of the output image is larger than the input image
extent, I get all sorts of problems.
I have tried using various parent classes, including
vtkImageAlgorithm. Currently I am using vtkDataSetAlgorithm (I
thought it would not try to be as "clever" as the
vtkImageAlgorithm, but it seems to be the same thing).
1. The full extent is not visualized:
by setting the the extent of the output in RequestData I managed to
get the visualization right:
outInfo->Set( vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(),
DataExtent, 6 );
outInfo->Set( vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(),
DataExtent, 6 );
2. Unfortunately, even with the addition above, the information
(extent, dimensions etc.) are not shown correctly in the
"Information tab" in paraview. Strangely enough, if I change a
parameter of the filter and call Apply a second time, the values in
the information tab are suddenly correct.
What I want is really a simple way to generate an output image with
different size/extent than the input image, without having all this
trouble setting pipeline information. Is there a way?
Thanks
Bryn
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