1. IMeshManipulator does not support mesh that using 32-bit index, so, for dynamic mesh with 32-bit index, IMeshManipulator will almost crashed.
2. the skybox and skydome node using same node-type-flag, so when the scene save and reload, the skydome will become skybox. Also, skybox and skydome node does not save it parameters that used to create to file, so when scene save and reload, the sky can't restore to the scene before saved.
3. the camera node does not fully save it animators to .irr file. when saving scene, the camera node (especially for cameraFPS and cameraMAYA) does not save the parameters of animators, so when reload the saved scene, my FPS camera's behavior is very strange because of missing animatorFPS parameters.