In this post understand cameras space and Perspective and Orthographic projections interactively.
The cube can be rotated using x, y and z keys. The The camera space can be changed by checking LookAt checkbox and supplying varying input for Position, Target and Up vectors.
Similarly, Perspective Projection can be changed by checking Perspective checkbox and supplying varying input for FOV, Near Plane and Far Plane. The FOV can be changed by typing page up and down keys or mouse wheel.Orthographic Projection can be changed by checking Orthographic checkbox and supplying varying input for X minmax, y minmax and Z minmax values.
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