> I have a problem of distortion of images (for example making a circle and
it
> will appear as an ellipse)

Well, you've got to take the size of the output image into account. If your
up-vector is <0,1,0>, and your output images is 320x200, then your right
vector should be <-1,0,0>*(320/200) or, to make it more flexible for
different kinds of images, I just use this:
 up y right x*image_width/image_height

Regards,
Tim

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
Email: tim.nikias (@) nolights.de

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