message: namespacing TransferFunction widget follow up
diff: @@ -303,7 +303,7 @@ void runApp()
  mpicommon::world.barrier();
  std::shared_ptr<ospray::sg::TransferFunction> transferFcn;
  - std::shared_ptr<ospray::TransferFunction> tfnWidget;
  + std::shared_ptr<ospray::imgui3D::TransferFunction> tfnWidget;
  std::shared_ptr<WindowState> windowState;
  GLFWwindow *window = nullptr;
  if (rank == 0) {
  @@ -322,7 +322,7 @@ void runApp()
  windowState = std::make_shared<WindowState>(app, arcballCamera);
  transferFcn = std::make_shared<ospray::sg::TransferFunction>();
  - tfnWidget = std::make_shared<ospray::TransferFunction>(transferFcn);
  + tfnWidget = std::make_shared<ospray::imgui3D::TransferFunction>(transferFcn);
  if (!transferFcnFile.str().empty()) {
  tfnWidget->load(transferFcnFile);
  }
  