Specifying An Arbitrary 3-D View

Two coordinate systems

World reference coordinate system (WRC)

Viewing reference coordinate system (VRC)

First specify a viewplane and coordinate system (WRC)

View Reference Point (VRP)

View Plane Normal (VPN)

View Up Vector (VUP)

Specify a window on the view plane (VRC)

Max and min u,v values ( Center of the window (CW))

Projection Reference Point (PRP)

Front and back clipping planes (hither and yon)