Cesar nous apporta ses lumieres en ce 2005-04-17 09:37:
>>And does so rightly,
>>
>>0.198669*1.30349 + 0.980067*(-0.26423) = 4.86e-8 != 0.0
>>
>>Specifying the up and right vector the way you did it usually does not
>>make sense.  You usually orient the camera with look_at or rotations and
>>leave up and right as default (except aspect ratio).  See the docs,
>>"3.3.1.1.5 Up and Right Vectors" for more explanation.
>>
>>And no, using doubles in your program won't help since you transfer the
>>numbers in decimal ascii.
>>
>>Christoph
>>
>>--
>>POV-Ray tutorials, include files, Sim-POV,
>>HCR-Edit and more: http://www.tu-bs.de/~y0013390/
>>Last updated 27 Feb. 2005 _____.//^>_*_<^/.______
> 
> 
> Ok... Could I use look-at and use my recently calculated up-vector as sky?
> Would that work? Or I have to use "angle" to make it right? Problems aside,
> this subject brings me to another question: is there a way to make povray
> accept the non-perpendicular vectors and generate a distorted image? I
> could be interested in that...
> 
> 
When POV Ray complains about non perpendicular, it's just a warning. It will still
render the scene. 
Yes, it can lead to skewed or distorted image. It's similar to those cameras where you
can shift and 
rotate the objective relative to the film plane. (at least in my view)

Alain

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