Controlling the viewpoint
Syntax: Viewpoint
 
- A Viewpoint node specifies a
named viewing location
	- position and orientation - viewing location
	- fieldOfView - camera lens angle
	- description - description for viewpoint menu
 
- Viewpoint {
    position    0.0 0.0 10.0
    orientation 0.0 0.0 1.0 0.0
    fieldOfView 0.785
    description "Entry View"
}