Method LoadVolume

Rendering/VolumeOpenGL2/vtkVolumeTexture.cxx:68–173

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//------------------------------------------------------------------------------
bool vtkVolumeTexture::LoadVolume(
  vtkRenderer* ren, vtkDataSet* data, vtkDataArray* scalars, int isCell, int interpolation)
{
  this->ClearBlocks();
  this->Scalars = scalars;
  this->IsCellData = isCell;
  this->InterpolationType = interpolation;
  vtkImageData* imData = vtkImageData::SafeDownCast(data);
  vtkRectilinearGrid* rGrid = vtkRectilinearGrid::SafeDownCast(data);
  if (imData)
  {
    imData->GetExtent(this->FullExtent.GetData());
  }
  else if (rGrid)
  {
    rGrid->GetExtent(this->FullExtent.GetData());
  }

  // Setup partition blocks
  if (this->Partitions[0] > 1 || this->Partitions[1] > 1 || this->Partitions[2] > 1)
  {
    // TODO: Partitions are only supported for image data input for now.
    if (!imData)
    {

      vtkErrorMacro(<< "Partitioning only supported for vtkImageData input right now!");
      return false;
    }
    this->SplitVolume(imData, this->Partitions);
  }
  else // Single block
  {
    if (this->IsCellData == 1)
    {
      this->AdjustExtentForCell(this->FullExtent);
    }
    if (imData)
    {
      vtkImageData* singleBlock = nullptr;
      if (vtkUniformGrid* ugData = vtkUniformGrid::SafeDownCast(data))
      {
        singleBlock = vtkUniformGrid::New();
        singleBlock->ShallowCopy(ugData);
      }
      else
      {
        singleBlock = vtkImageData::New();
        singleBlock->ShallowCopy(imData);
      }
      singleBlock->SetExtent(this->FullExtent.GetData());
      this->ImageDataBlocks.push_back(singleBlock);
    }
    else if (rGrid)
    {
      vtkRectilinearGrid* singleBlock = vtkRectilinearGrid::New();
      singleBlock->ShallowCopy(rGrid);
      // Do not update the block extent at this time.
      // We need the full block extent in ComputeBounds later on.