Compute a given property of a view.

Input parameters:

1. Vw → View to zoom.
2. Pr → Property to measure.
   •  0 → Projection
   •  1 → Camera
   •  2 → Target
   •  3 → Centre
   •  4 → Direction
   •  5 → Up
   •  6 → Lens length
   •  7 → Canonical Angle
   •  8 → Horizontal Angle
   •  9 → Vertical Angle
   • 10 → Aspect
   • 11 → Bottom Plane
   • 12 → Top Plane
   • 13 → Left Plane
   • 14 → Right Plane
   • 15 → Near Plane
   • 16 → Far Plane

Output parameters:

1. Pr → Requested view property. The type will depend on the property.