> - Although not very widely known, a `normal` statement can be applied to
> the camera to distort the image based on a pattern.
I didn't know this trick, it deserves a try.
> - The `user_defined` camera being introduced in v3.8 can also be used to
> implement almost arbitrary camera projections, provided they can be
> expressed as a set of functions mapping screen coordinates to ray origin
> coordinates and direction vector components.
This could be very useful. I hope that this feature will be well documented.
Nevertheless, I still think that an implementation of optical distortion
consistent with the literature definitions and terms (as in the followong
references) would be preferable and more useful (and appealing!) for the
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