[Paraview] problems with ServerManagerConfiguration and vtkImageReslice

[Dominik Szczerba]

Hi Jerome,

Thanks for the references, but there does not to be any solution in there?
And yes, "strange extents" are also taking place in some cases, i.e.,
extents are actually correct, but the content of the image data is
smaller if the new spacing is finer than the original.
Due to the lack of detailed description of this whole mechanism I can
not say if this is my lack of knowledge or a bug.

Regarding segfaults, the only non-standard thing I can say about my
input image data is that it contains a scalar type "double". The said
filters will work with image generated by Sources/Wavelet, but the
type of that one is float. I am afraid something is hardcoded
somewhere.

Regards,
Dominik

On Fri, May 20, 2011 at 8:25 AM, Jérôme <jerome.velut at gmail.com> wrote:
> Hi,
> regarding the vtkImageSlice exposition in ParaView, you should take
> a look at these threads:
> - issue report:
>    http://www.mail-archive.com/paraview@paraview.org/msg02225.html
>    http://www.mail-archive.com/paraview@paraview.org/msg08260.html
> - issue deep explanation:
>    http://www.cmake.org/pipermail/paraview/2010-June/017738.html
>
> regarding the segfault, I feel surprise ! I use Median and Gradient very
> often, and I never noticed a bug. Can you give the step to reproduce ?
>
> Best regards,
> Jerome
>
>
> 2011/5/19 Dominik Szczerba <dominik at itis.ethz.ch>
>>
>> I think my theory that it has to do with threading may be correct...
>>
>> I just tried instead of my custom plugin to run the built-in Gradient
>> or Median on my vtkImageData and Paraview (3.11) silently segfaults.
>> Both these built-in filters derive from vtkThreadedImageAlgorithm.
>> Built-in vtkExtractVOI. however, works correctly, just as my other
>> custom plugins deriving from vtkImageAlgorithm.
>>
>> Any pointers in this bug hunting are appreciated.
>>
>> Dominik
>>
>> On Thu, May 19, 2011 at 9:30 PM, Dominik Szczerba <dominik at itis.ethz.ch>
>> wrote:
>> > So far I was able to add a few simple custom plugins, but am slowly
>> > losing the grip.
>> > I am trying to resample an image like this:
>> >
>> > <SourceProxy name="ImageResample" class="vtkImageResample"
>> > label="ImageResample">
>> > <InputProperty name="Input" command="SetInputConnection">
>> >        <ProxyGroupDomain name="groups">
>> >                <Group name="sources"/>
>> >                <Group name="filters"/>
>> >        </ProxyGroupDomain>
>> >        <DataTypeDomain name="input_type">
>> >                <DataType value="vtkImageData"/>
>> >        </DataTypeDomain>
>> > </InputProperty>
>> > <DoubleVectorProperty name="Magnification Factor"
>> > command="SetAxisMagnificationFactor" number_of_elements="3"
>> > number_of_elements_per_command="1" repeat_command="1" use_index="1"
>> > default_values="1 1 1"/>
>> >
>> > I get these 2 problems:
>> >
>> > 1) There appear two (!) outputs (named Output-0 and Output-1). I get
>> > this message:
>> >
>> > ERROR: In
>> > /home/dsz/pack/ParaView/VTK/Filtering/vtkDemandDrivenPipeline.cxx,
>> > line 827
>> > vtkPVPostFilterExecutive (0x3aa4f60): Input for connection index 0 on
>> > input port index 0 for algorithm vtkPVPostFilter(0x2cfb850) is of type
>> > vtkImageStencilData, but a vtkDataSet is required.
>> >
>> > 2) The first output has the expected Spacing, but it does not contain
>> > the same scalar array as in the input. Instead, it contains a new
>> > array ImageScalars ranging [0,0]. I get this message:
>> >
>> > Warning: In
>> > /home/dsz/pack/ParaView/ParaViewCore/VTKExtensions/vtkTexturePainter.cxx,
>> > line 179
>> > vtkTexturePainter (0x339fa70): Failed to locate selected scalars. Will
>> > use image scalars by default.
>> >
>> > I have been so far successful with other image algorithms, however
>> > they were all deriving from vtkImageAlgorithm. This one derives from
>> > vtkThreadedImageAlgorithm - could this have anything to do here?
>> > Could anyone point me into the right direction? After inspection of
>> > the xml files in the ParaView source tree I am still clueless.
>> >
>> > Thanks and regards,
>> > Dominik
>> >
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