Sorry, a mistake:
#declare eye = 0; // 0: No-Stereo, 1: Left, 2: Right
it's wrong, the correct is
#declare eye = 0; // 0: No-Stereo, -1: Left, +1: Right


Anyway, i still think the above user-defined camera can be used as proof of
concept of the new great camera type.
But imho ODS (used by up-coming VR market) deserve a C implementation, with
user-friendly params for users.
Maybe current 'spherical' can be extended with ODS params, maintain backward
compatibility if absent, without need a new camera type.

Writing a full ODS user_defined camera, considering both eyes render in
different formats, and also start location and direction, can result in a huge,
unreadable macro.

Just my cents.

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