Am 04.03.2016 um 04:19 schrieb ThH:
> scenes/camera/shear.pov
> 
> I'm wondering what's going on here...
> 
> ==== [Parsing...]
> ==========================================================
> File 'shear.pov' line 48: Parse Warning: Camera vectors are not
> perpendicular.
>  Making look_at the last statement may help.
...

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.

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