Cesar wrote:
> 
> I honestly don't think it's a bug in my app. The vectors are, for example:
> 
> direction <0,  1, 0>
> up <0.198669, 0, 0.980067>
> right <1.30349, 0, -0.26423>
> 
> and povray complains about perpendicularity.

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

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