[vtkusers] Help! Writing a filter to get vtkImageData from vtkUnstructuredGrid...

[Cory Quammen]

Oops, forgot to post the link to the filter:

https://github.com/cquammen/vtkPartialVolumeModeller

Usually I only forget to attach files, not insert links.

Look in the class vtkPartialVolumeModeller.

Hope that helps,
Cory

On Thu, Jul 26, 2012 at 1:26 PM, Cory Quammen <cquammen at cs.unc.edu> wrote:
> I have a filter similar to what you are try to do in terms of input
> and output. You can take a look at my implementations of
> FillInputPortInformation and RequestInformation. Please note that this
> is based on VTK 5.10.0 and may not work with the most recent VTK in
> git.
>
> One thing that I am immediately suspicious of is whether you have the
> proper method signature for overriding the methods correctly. Without
> seeing the code, I can't tell :-) You could compile in debug mode and
> set a break point  within your methods using your favorite debugger to
> make sure they are being called.
>
> Cory
>
> On Thu, Jul 26, 2012 at 1:18 PM, Ricardo Villegas <ricvilleg at gmail.com> wrote:
>> Hello,
>>
>> I'm writing a filter to obtain a 3D vtkImageData from a volume represented
>> as a vtkUnstructuredGrid.
>> The image data is being obtained by sampling the unstructured grid with
>> certain criteria and the help of a 3D widget.
>>
>> I chose vtkImageAlgorithm as the base class for my filter, overriding the
>> FillInputPortInformation for setting the proper input data.
>> The application crashes when I connect the output of this filter to a mapper
>> or any other component for its visualization.
>> It seems something is wrong in the RequestInformation method because it
>> expects vtkImageData as an input. I overrode it; nothing changed.
>> Curiously, if I attach a vtkImageChangeInformation filter that acts an
>> intermediary between my filter and the next componente in the pipeline, it
>> works fine. However, I want my filter can work standalone without using a
>> vtkImageChangeInformation after it.
>>
>> Could somebody give me a hint about what could wrong here? Which other
>> methods from vtkImageAlgorith should I change so that my filter works? Is
>> there a solution?
>>
>> Thanks in advance,
>>
>> Ricardo Villegas
>>
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>
>
> --
> Cory Quammen
> Research Associate
> Department of Computer Science
> The University of North Carolina at Chapel Hill



-- 
Cory Quammen
Research Associate
Department of Computer Science
The University of North Carolina at Chapel Hill