Method UpdateShadingTable

Rendering/Volume/vtkFixedPointVolumeRayCastMapper.cxx:2698–2751

}

int vtkFixedPointVolumeRayCastMapper::UpdateShadingTable(vtkRenderer* ren, vtkVolume* vol)
{
  if (this->ShadingRequired == 0)
  {
    return 0;
  }

  // How many components?
  int components = this->CurrentScalars->GetNumberOfComponents();

  int c;
  for (c = 0; c < ((vol->GetProperty()->GetIndependentComponents()) ? (components) : (1)); c++)
  {
    this->GradientShader->SetActiveComponent(c);
    this->GradientShader->UpdateShadingTable(ren, vol, this->GradientEstimator);

    float* r = this->GradientShader->GetRedDiffuseShadingTable(vol);
    float* g = this->GradientShader->GetGreenDiffuseShadingTable(vol);
    float* b = this->GradientShader->GetBlueDiffuseShadingTable(vol);

    float* rptr = r;
    float* gptr = g;
    float* bptr = b;

    unsigned short* tablePtr = this->DiffuseShadingTable[c];

    int i;
    for (i = 0; i < this->DirectionEncoder->GetNumberOfEncodedDirections(); i++)
    {
      *(tablePtr++) = static_cast<unsigned short>((*(rptr++)) * VTKKW_FP_SCALE + 0.5);
      *(tablePtr++) = static_cast<unsigned short>((*(gptr++)) * VTKKW_FP_SCALE + 0.5);
      *(tablePtr++) = static_cast<unsigned short>((*(bptr++)) * VTKKW_FP_SCALE + 0.5);
    }

    r = this->GradientShader->GetRedSpecularShadingTable(vol);
    g = this->GradientShader->GetGreenSpecularShadingTable(vol);
    b = this->GradientShader->GetBlueSpecularShadingTable(vol);

    rptr = r;
    gptr = g;
    bptr = b;

    tablePtr = this->SpecularShadingTable[c];

    for (i = 0; i < this->DirectionEncoder->GetNumberOfEncodedDirections(); i++)
    {
      *(tablePtr++) = static_cast<unsigned short>((*(rptr++)) * VTKKW_FP_SCALE + 0.5);
      *(tablePtr++) = static_cast<unsigned short>((*(gptr++)) * VTKKW_FP_SCALE + 0.5);
      *(tablePtr++) = static_cast<unsigned short>((*(bptr++)) * VTKKW_FP_SCALE + 0.5);
    }
  }

  return 1;
}

int vtkFixedPointVolumeRayCastMapper::UpdateGradients(vtkVolume* vol)
{