Method UpdateRay

Rendering/VR/vtkVRInteractorStyle.cxx:1177–1275

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//------------------------------------------------------------------------------
void vtkVRInteractorStyle::UpdateRay(vtkEventDataDevice controller)
{
  if (!this->Interactor)
  {
    return;
  }

  vtkRenderer* ren = this->CurrentRenderer;
  vtkVRRenderWindow* renWin = vtkVRRenderWindow::SafeDownCast(this->Interactor->GetRenderWindow());
  vtkVRRenderWindowInteractor* iren = vtkVRRenderWindowInteractor::SafeDownCast(this->Interactor);

  if (!ren || !renWin || !iren)
  {
    return;
  }

  vtkVRModel* mod = renWin->GetModelForDevice(controller);
  if (!mod)
  {
    return;
  }

  int idev = static_cast<int>(controller);

  // Keep the same ray if a controller is interacting with a prop
  if (this->InteractionProps[idev] != nullptr)
  {
    return;
  }

  // Check if interacting with a widget
  vtkPropCollection* props = ren->GetViewProps();

  vtkIdType nbProps = props->GetNumberOfItems();
  for (vtkIdType i = 0; i < nbProps; i++)
  {
    vtkWidgetRepresentation* rep = vtkWidgetRepresentation::SafeDownCast(props->GetItemAsObject(i));

    if (rep && rep->IsA("vtkQWidgetRepresentation") && rep->GetInteractionState() != 0)
    {
      mod->SetShowRay(true);
      mod->SetRayLength(ren->GetActiveCamera()->GetClippingRange()[1]);
      mod->SetRayColor(0.0, 0.0, 1.0);
      return;
    }
  }

  if (this->GetGrabWithRay() || this->InteractionState[idev] == VTKIS_PICK)
  {
    mod->SetShowRay(true);
  }
  else
  {
    mod->SetShowRay(false);
    return;
  }

  // Set length to its max if interactive picking is off