[Paraview] Fwd: Image Doesn't load correctly

Tue May 5 12:09:13 EDT 2015

---------- Forwarded message ----------
From: Dean, Kevin <kevin.dean at decisionsciencescorp.com>
Date: Mon, May 4, 2015 at 5:10 PM
Subject: Re: [Paraview] Image Doesn't load correctly
To: Burlen Loring <burlen.loring at gmail.com>

awesome, thanks, that did it.

One more question. Is there a way to debug the FileName aspect of the
reader. I can't figure out how it's supposed to get set. The only way I can
get the image to show is by hard
coding it within the RequestData() function.

Thanks Again

Kevin E. Dean

On Mon, May 4, 2015 at 11:33 AM, Burlen Loring <burlen.loring at gmail.com>
wrote:

>  Hi Kevin.
>
> Your RequestInformation looks a little bare. Unless things have changed
> recently, you might need to set WHOLE_EXTENT, ORIGIN, SPACING,
> CAN_PRODUCE_SUB_EXTENT keys there. and if you support parallel IO honor the
> requested extent in RequestData.
>
> Burlen
>
>
> On 05/04/2015 09:52 AM, Dean, Kevin wrote:
>
>  So I am still having a few issues with the reader. I have checked the
> output from the information Panel. And it seems as if all the information
> is the same. So maybe the data is getting deleted somehow (I'm not
> sure...., but here is a snippet of my code);
>
> int vtkPVPROTOImageReader::RequestInformation (
>    vtkInformation*,
>    vtkInformationVector**,
>    vtkInformationVector* outputVector)
> {
>    vtkInformation* outInfo = outputVector->GetInformationObject(0);
>    vtkDataObject::SetPointDataActiveScalarInfo(outInfo, VTK_UNSIGNED_CHAR,
> 1);
>
>    return 1;
> }
>
> int vtkPVPROTOImageReader::RequestData(vtkInformation *vtkNotUsed(request),
>                                        vtkInformationVector **inputVector,
>                                        vtkInformationVector *outputVector)
> {
>     ... conversion code from protobuf
>
>   /* Convert from protobuf to vtkImageData */
>   vtkSmartPointer<vtkImageData> image = "function converting to protobuf";
>
>   vtkDataArray* scalars = image->GetPointData()->GetScalars();
>   scalars->SetName("ReconstructionData");
>
>   /* Get the info object */
>   vtkInformation *outInfo = outputVector->GetInformationObject(0);
>   outInfo->Set(vtkDataObject::DATA_TYPE_NAME(), "vtkImageData");
>
>   /* Get the output */
>   vtkImageData* output = vtkImageData::GetData(outputVector);
>
> //  output->SetSpacing(image->GetSpacing());
> //  output->SetOrigin(image->GetOrigin());
> //  output->AllocateScalars(outInfo);
> //
> output->GetPointData()->SetScalars(image->GetPointData()->GetScalars());
> //  output->SetDimensions(image->GetDimensions());
>
>   output->ShallowCopy(image);
>
>   int* dimensions = output->GetDimensions();
>
>   std::cout << "\nNumber of points: " << output->GetNumberOfPoints() <<
> std::endl;
>   std::cout << "Number of cells: " << output->GetNumberOfCells() << "\n"
> << std::endl;
>
>  // print out the pixel values to see if they are actually present
>   for (int z = 0; z < dimensions[2]; z++)
>   {
>     for (int y = 0; y < dimensions[1]; y++)
>     {
>       for (int x = 0; x < dimensions[0]; x++)
>       {
>         double* pixel =
> static_cast<double*>(output->GetScalarPointer(x,y,z));
>         // do something with v
>         std::cout << "pixel value: " << pixel[0] << "\n";
>       }
>       std::cout << std::endl;
>     }
>     std::cout << std::endl;
>   }
>
>   // write output to file and compare in visualization window...
>   vtkSmartPointer<vtkXMLImageDataWriter> vtk_writer =
> vtkSmartPointer<vtkXMLImageDataWriter>::New();
>   vtk_writer->SetInputData(output);
>   vtk_writer->SetFileName( "/home/kdean/tmp/foo.vti" );
>   vtk_writer->Update();
>   vtk_writer->Write();
>
>   return 1;
> }
>
>
>  Another Problem I ran into:
>  So I had to hardcode a file for the char *FileName into the RequestData
> Function in order to read any protobuf file. I ran a debugger on the code,
> and it seems like these functions from the header file (of the reader):
>
> vtkGetStringMacro(FileName);
> vtkSetStringMacro(FileName);
>
>  they are never getting called.
>
>  Thanks,
>
>  Kevin
>
>  here are my xml too... it looks right, but maybe I am missing something.
>
> On Sun, May 3, 2015 at 7:04 AM, Utkarsh Ayachit <
> utkarsh.ayachit at kitware.com> wrote:
>
>> You can also use the Information panel to see what arrays are being
>> read in and what their ranges are.
>>
>> On Sat, May 2, 2015 at 7:06 PM, Dean, Kevin
>> <kevin.dean at decisionsciencescorp.com> wrote:
>> > looked at the spreadsheet view in the GUI, and it looks like none of the
>> > Point Data is actually being copied...
>> >
>> > On Sat, May 2, 2015 at 3:44 PM, Dean, Kevin
>> > <kevin.dean at decisionsciencescorp.com> wrote:
>> >>
>> >> What's up Utkarsh?
>> >>
>> >> So I was able to write that plugin and convert my image to the
>> >> vtkImageData. However, I am having trouble visualizing the image.
>> However,
>> >> when I write out the output from my reader, the image gets written
>> >> correctly... Here are some pictures to show the differences. (All the
>> >> information for the images is exactly the same) Do you have an idea of
>> how I
>> >> can try to fix it? Thanks.
>> >>
>> >> Kevin E. Dean
>> >
>> >
>> >
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>
>
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