3.when you have another Layers except the default or without the order of Gizmos <- Nav, just set the main camera CULLING MASK to: "select Gizmos and unselect Nav", and make sure
the camera's CULLING MASK to "unselect Gizmos and select Nav" which under the TrackBall;
This is a Gizmos Sets for runtime:
1.CameraNavgator
2.Move
3.Scale
4.Rotate
Those mostly same as unity navtive Gizmos,and extend snap function for move/scale/rotate, and the interface is every easy to use!
The demo in Sences Path,show how to use the Gizmos.