Method CreateTransferFunction1D

Rendering/VolumeOpenGL2/vtkVolumeInputHelper.cxx:337–381

}

void vtkVolumeInputHelper::CreateTransferFunction1D(vtkRenderer* ren, int index)
{
  this->ReleaseGraphicsTransfer1D(ren->GetRenderWindow());

  int const numActiveLuts =
    this->ComponentMode == INDEPENDENT ? Texture->GetLoadedScalars()->GetNumberOfComponents() : 1;

  // Create RGB and opacity (scalar and gradient) lookup tables. Up to four
  // components are supported in single-input independentComponents mode.
  this->RGBTables = vtkSmartPointer<vtkOpenGLVolumeLookupTables<vtkOpenGLVolumeRGBTable>>::New();
  this->RGBTables->Create(numActiveLuts);
  this->OpacityTables =
    vtkSmartPointer<vtkOpenGLVolumeLookupTables<vtkOpenGLVolumeOpacityTable>>::New();
  this->OpacityTables->Create(numActiveLuts);
  this->GradientOpacityTables =
    vtkSmartPointer<vtkOpenGLVolumeLookupTables<vtkOpenGLVolumeGradientOpacityTable>>::New();
  this->GradientOpacityTables->Create(numActiveLuts);

  this->OpacityTablesMap.clear();
  this->RGBTablesMap.clear();
  this->GradientOpacityTablesMap.clear();

  std::ostringstream idx;
  idx << index;

  this->GradientCacheName = "g_gradients_" + idx.str();

  for (int i = 0; i < numActiveLuts; ++i)
  {
    std::ostringstream comp;
    comp << "[" << i << "]";

    this->OpacityTablesMap[i] = "in_opacityTransferFunc_" + idx.str() + comp.str();
    this->RGBTablesMap[i] = "in_colorTransferFunc_" + idx.str() + comp.str();

    // Unlike color and scalar-op, graident-op is optional (some inputs may
    // or may not have gradient-op active).
    if (this->Volume->GetProperty()->HasGradientOpacity())
    {
      this->GradientOpacityTablesMap[i] = "in_gradientTransferFunc_" + idx.str() + comp.str();
    }
  }

  this->LutInit.Modified();
}

void vtkVolumeInputHelper::CreateTransferFunction2D(vtkRenderer* ren, int index)
{