Method SetupVectorMode

Rendering/VolumeOpenGL2/vtkSmartVolumeMapper.cxx:614–733

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
void vtkSmartVolumeMapper::SetupVectorMode(vtkVolume* vol)
{
  vtkDataSet* input = this->GetInput();
  if (!input)
  {
    vtkErrorMacro("Failed to setup vector rendering mode! No input.");
  }

  int isCellData = 0;
  vtkDataArray* dataArray = vtkSmartVolumeMapper::GetScalars(
    input, this->ScalarMode, this->ArrayAccessMode, this->ArrayId, this->ArrayName, isCellData);
  if (!dataArray)
  {
    vtkErrorMacro("Failed to locate data array.");
    return;
  }

  int const numComponents = dataArray->GetNumberOfComponents();
  switch (this->VectorMode)
  {
    case MAGNITUDE:
    {
      // ParaView sets mode as MAGNITUDE when there is a single component,
      // so check whether magnitude makes sense.
      if (numComponents > 1)
      {
        // Recompute magnitude if not up to date
        if (!this->ImageMagnitude ||
          input->GetMTime() > this->ImageMagnitude->GetOutput()->GetMTime())
        {
          if (!this->ImageMagnitude)
          {
            this->ImageMagnitude = vtkImageMagnitude::New();
          }

          // Proxy dataset (set the active attribute for the magnitude filter)
          if (isCellData)
          {
            this->ComputeMagnitudeCellData(input, dataArray);
          }
          else
          {
            this->ComputeMagnitudePointData(input, dataArray);
          }
        }

        if (this->InputDataMagnitude->GetMTime() > this->MagnitudeUploadTime)
        {
          this->GPUMapper->SetInputDataObject(this->InputDataMagnitude);
          this->GPUMapper->SelectScalarArray("Magnitude");
          this->MagnitudeUploadTime.Modified();
        }
      }
      else
      {
        // Data is not multi-component so use the array itself.
        if (this->ArrayAccessMode == VTK_GET_ARRAY_BY_NAME)
        {