Thorsten,
I also like to use a camera with image_width / image_height for the right.
Then I can change aspect ratio at render time without changing the script
file. So anyway, why is it abuse? Are there drawbacks to this method
that some of us are not aware? Also, I always use a perspective camera
because typically I'm rendering stereo pairs, and it is difference in
perspective
that creates the stereo effect. Would orthographic cameras work too?
Guess I should experiment.

TIA
Harold

"Thorsten Froehlich" <tho### [at] trfde> wrote in message
news:4003d307$1@news.povray.org...
> In article <4003c4eb$1@news.povray.org> , "Hughes, B."
> <omn### [at] charternet> wrote:
> >
> >  camera {
> >      location <3, 0, 0.5>
> >      right image_width/image_height*y
> >      up <0, 0, 1>
> >      direction  <-1, 0, 0>
> >  }
>
> For a 640x320 image, the resulting camera you suggest will be absolutely
> identical!  And it cannot solve the "problem" with the sphere either.
>
> So what is the point of your suggestion? ;-)  Neither image_width nor
> image_height are appropriate for this scene; nor do they belong in 99% of
> the scenes where they are (ab)used.
>
> The reason the sphere appears distorted is the default perspective camera.
> So there is nothing wrong with the scene.  The perspective camera will
make
> objects that are close and not in the center of the image appear
distorted,
> which is especially visible if the image aspect ratio is on the extreme
side
> of things.  Depending on the scene, I would suggest to either use a
smaller
> camera angle (and increase the camera to object distance) or select
another
> camera (some trial and error may be necessary in that case).
>
>     Thorsten
>
> ____________________________________________________
> Thorsten Froehlich
> e-mail: mac### [at] povrayorg
>
> I am a member of the POV-Ray Team.
> Visit POV-Ray on the web: http://mac.povray.org

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