Method Initialize

Rendering/VolumeOpenGL2/vtkSmartVolumeMapper.cxx:276–318

------------------------------------------------------------------------------ Initialize the render We need to determine whether the GPU or CPU mapper are supported First we need to know what input scalar field we are working with to find out how many components it has. If it has more than one and we are considering them to be independent components, then only GPU Mapper will be supported. ------

// them to be independent components, then only GPU Mapper will be supported.
//------------------------------------------------------------------------------
void vtkSmartVolumeMapper::Initialize(vtkRenderer* ren, vtkVolume* vol)
{
  vtkDataSet* input = this->GetInput();
  if (!input)
  {
    this->Initialized = 0;
    return;
  }

  int usingCellColors = 0;
  vtkDataArray* scalars = vtkSmartVolumeMapper::GetScalars(input, this->ScalarMode,
    this->ArrayAccessMode, this->ArrayId, this->ArrayName, usingCellColors);

  if (!scalars)
  {
    vtkErrorMacro("Could not find the requested vtkDataArray! "
      << this->ScalarMode << ", " << this->ArrayAccessMode << ", " << this->ArrayId << ", "
      << this->ArrayName);
    this->Initialized = 0;
    return;
  }

  int const numComp = scalars->GetNumberOfComponents();
  this->RayCastSupported = (usingCellColors || numComp > 1) ? 0 : 1;

  if (!this->RayCastSupported &&
    this->RequestedRenderMode == vtkSmartVolumeMapper::RayCastRenderMode)
  {
    vtkWarningMacro(
      "Data array " << this->ArrayName
                    << " is not supported by"
                       "FixedPointVolumeRCMapper (either cell data or multiple components).");
  }

  // Make the window current because we need the OpenGL context
  vtkRenderWindow* win = ren->GetRenderWindow();
  win->MakeCurrent();

  this->GPUSupported = this->GPUMapper->IsRenderSupported(win, vol->GetProperty());
  this->Initialized = 1;
  this->InitializedBlendMode = this->GetBlendMode();
  this->SupportStatusCheckTime.Modified();
}

//------------------------------------------------------------------------------
// Compute the render mode based on what hardware is available, what the user