[Paraview] Image Doesn't load correctly

[Burlen Loring]

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 <mailto: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
>     <mailto: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
>     <mailto: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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