Mick Hazelgrove <mha### [at] mindaswinternetcouk> wrote:
: I am trying to make a pic with a vertical/portrait aspect and I have
: modified the camera thus:

  I don't know if this answers your question, but when I make a non-4/3
camera, I make it this way:

#declare ImageWidth=512;
#declare ImageHeight=512;

camera
{ right x*ImageWidth/ImageHeight
  location <0, .24, 99>
  look_at 0
  angle 35
}

  Some notes:
  Always put the 'right' statement as the first statement of the camera
declaration.
  I always use 'angle' instead of 'direction' since I don't know how the
latter works, but 'angle' works just like I think.
  The default 'up' vector is just ok. Usually you don't have to change it.
I have never needed it, even with tilted cameras. If you want to tilt
the camera, you can rotate it. The only use of the 'up' vector I can imagine
is when you want to specify a tilt angle for the camera (and you don't know
how to apply it by rotating the camera when the camera is not at the origin):

#declare CamTiltAngle=35;

camera
{ up <sin(radians(CamTiltAngle)),cos(radians(CamTiltAngle)),0>
  location <1,2,3>
  look_at <4,5,6>
  angle 35
}

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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