The current fov (field of view)
The new fov
Set the current viewpoint, make sure to wait for this call to finish
The ViewPoint to set. When no fov has been set on the ViewPoint, the fov will be unchanged
The time to animate in ms, the default is 0 and indicates no animation at all
Set the fov (field of view). Whenever a fov of 0 is set, the camera wil switch to orthographic view. Whenever the fov is set to any positive value below 120 it will switch to perspective view.