Method Render

Rendering/Volume/vtkGPUVolumeRayCastMapper.cxx:137–182

------------------------------------------------------------------------------ The render method that is called from the volume. If this is a canonical view render, a specialized version of this method will be called instead. Otherwise we will - Invoke a start event - Start timing - Check that everything is OK for rendering - Render - Stop the timer and record results - Invoke an end event -------

//   - Invoke an end event
//------------------------------------------------------------------------------
void vtkGPUVolumeRayCastMapper::Render(vtkRenderer* ren, vtkVolume* vol)
{
  // Catch renders that are happening due to a canonical view render and
  // handle them separately.
  if (this->GeneratingCanonicalView)
  {
    this->CanonicalViewRender(ren, vol);
    return;
  }

  // Invoke a VolumeMapperRenderStartEvent
  this->InvokeEvent(vtkCommand::VolumeMapperRenderStartEvent, nullptr);

  // Start the timer to time the length of this render
  vtkTimerLog* timer = vtkTimerLog::New();
  timer->StartTimer();

  // Make sure everything about this render is OK.
  // This is where the input is updated.
  if (this->ValidateRender(ren, vol))
  {
    // Everything is OK - so go ahead and really do the render
    this->GPURender(ren, vol);
  }

  // Stop the timer
  timer->StopTimer();
  double t = timer->GetElapsedTime();

  //  std::cout << "Render Timer " << t << " seconds, " << 1.0/t << " frames per second" << endl;

  this->TimeToDraw = t;
  timer->Delete();

  if (vol->GetAllocatedRenderTime() < 1.0)
  {
    this->SmallTimeToDraw = t;
  }
  else
  {
    this->BigTimeToDraw = t;
  }

  // Invoke a VolumeMapperRenderEndEvent
  this->InvokeEvent(vtkCommand::VolumeMapperRenderEndEvent, nullptr);
}

//------------------------------------------------------------------------------
// Special version for rendering a canonical view - we don't do things like