A Projection, A Scene and A Camera and Feedback

Camera
Look At
Left:Right
Top:Bottom
Near:Far

Keys wasdUu to move the camera: u y down, U y up.

Keys hjkl to move the look at: hl: x, jk: y

Keys 12 move the walls wider (1) and narrower (2)

Keys 34 move the top and bottom wider (3) and narrower (4)

Key 56 move the near plane closer (5) and further (6)