message: use the arcball camera lib
diff: @@ -61,22 +61,19 @@ target_include_directories(ospMPIDistributedTutorialAsync PRIVATE
  $<BUILD_INTERFACE:${MPI_C_INCLUDE_PATH}>)
  set(OSPRAY_EXAMPLE_DIR "${OSPRay_SOURCE_DIR}/apps/ospExamples")
  -set(OSPRAY_ARCBALL_DIR "${OSPRay_SOURCE_DIR}/apps/common/arcball_camera")
  add_library(mpi_tutorial_common STATIC
  GLFWDistribOSPRayWindow.cpp
  - ${OSPRAY_ARCBALL_DIR}/ArcballCamera.cpp
  ${OSPRAY_EXAMPLE_DIR}/imgui_impl_glfw_gl3.cpp
  )
  -ospray_install_library(mpi_tutorial_common COMPONENT apps)
  -
  target_link_libraries(mpi_tutorial_common PUBLIC
  ospcommon::ospcommon
  ospray
  ospray_testing
  ospray_imgui
  glfw
  + arcball_camera
  ${OPENGL_LIBRARIES}
  ${MPI_CXX_LIBRARIES}
  )
  