Am 04.03.2016 um 08:23 schrieb clipka:

> In the vast majority of cases, camera vectors are intended to be
> perpendicular, but there are ways to accidently screw this up, so
> POV-Ray warns about this situation. Judging from the warning's wording,
> the most common way people would screw this up in the past was to place
> look_at before the up, right and/or direction vector.
>
> In this particular case, the camera vectors are non-perpendicular by
> intention, to demonstrate a way to implement a tilt-shift camera.

Thanks for your explanation clipka. Really don't want to mess around 
with anybody's intentions ;))

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