The viewpoint is determined by three vectors, From , Towards , Up and an angle ViewAngle . The viewer of the scene sits at From and looks towards Towards . Up specifies which direction is vertical on the screen. The ViewAngle is similar to changing lenses on camera or zooming.
Large angles cover more area but introduce more perspective.
ViewAngles of 25-50 degrees look natural. To zoom in and out you can change From as well as ViewAngle . Towards should be in the middle of the scene. To set the viewpoint use the viewpoint command on the view menu . Because of the rate of fall-off of the lights the whole scene should be around 2 units wide.