Method ComputeBounds

Rendering/VolumeOpenGL2/vtkMultiBlockVolumeMapper.cxx:163–195

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//------------------------------------------------------------------------------
void vtkMultiBlockVolumeMapper::ComputeBounds()
{
  auto input = this->GetDataObjectTreeInput();
  assert(input != nullptr);
  if (input->GetMTime() == this->BoundsComputeTime)
  {
    // don't need to recompute bounds.
    return;
  }

  // Loop over the hierarchy of data objects to compute bounds
  vtkBoundingBox bbox;
  vtkCompositeDataIterator* iter = input->NewIterator();
  for (iter->GoToFirstItem(); !iter->IsDoneWithTraversal(); iter->GoToNextItem())
  {
    if (vtkImageData* img = vtkImageData::SafeDownCast(iter->GetCurrentDataObject()))
      if (img)
      {
        double bds[6];
        img->GetBounds(bds);
        bbox.AddBounds(bds);
      }
  }
  iter->Delete();

  vtkMath::UninitializeBounds(this->Bounds);
  if (bbox.IsValid())
  {
    bbox.GetBounds(this->Bounds);
  }

  this->BoundsComputeTime = input->GetMTime();
}

//------------------------------------------------------------------------------
vtkDataObjectTree* vtkMultiBlockVolumeMapper::GetDataObjectTreeInput()