Method Render

Rendering/Volume/vtkUnstructuredGridVolumeRayCastMapper.cxx:171–465

void vtkUnstructuredGridVolumeRayCastMapper::ReleaseGraphicsResources(vtkWindow*) {}

void vtkUnstructuredGridVolumeRayCastMapper::Render(vtkRenderer* ren, vtkVolume* vol)
{
  int i;

  // Check for input
  if (this->GetInput() == nullptr)
  {
    vtkErrorMacro(<< "No Input!");
    return;
  }

  int inputAlgPort;
  vtkAlgorithm* inputAlg = this->GetInputAlgorithm(0, 0, inputAlgPort);
  inputAlg->UpdateWholeExtent();

  this->Scalars = vtkUnstructuredGridVolumeRayCastMapper::GetScalars(this->GetInput(),
    this->ScalarMode, this->ArrayAccessMode, this->ArrayId, this->ArrayName, this->CellScalars);

  if (this->Scalars == nullptr)
  {
    vtkErrorMacro("Can't use the ray cast mapper without scalars!");
    return;
  }

  // Check to make sure we have an appropriate integrator.
  if (this->RayIntegrator)
  {
    if (this->RealRayIntegrator != this->RayIntegrator)
    {
      if (this->RealRayIntegrator)
      {
        this->RealRayIntegrator->UnRegister(this);
      }
      this->RealRayIntegrator = this->RayIntegrator;
      this->RealRayIntegrator->Register(this);
    }
  }
  else
  {

#define ESTABLISH_INTEGRATOR(classname)                                                            \
  do                                                                                               \
  {                                                                                                \
    if (!this->RealRayIntegrator || (!this->RealRayIntegrator->IsA(#classname)))                   \
    {                                                                                              \
      if (this->RealRayIntegrator)                                                                 \
        this->RealRayIntegrator->UnRegister(this);                                                 \
      this->RealRayIntegrator = classname::New();                                                  \
      this->RealRayIntegrator->Register(this);                                                     \
      this->RealRayIntegrator->Delete();                                                           \
    }                                                                                              \
  } while (false)

    if (this->CellScalars)
    {
      ESTABLISH_INTEGRATOR(vtkUnstructuredGridHomogeneousRayIntegrator);
    }
    else