"Steven Jones" <ste### [at] tsncc> wrote in message
news:3b9d201c@news.povray.org...
> I'm trying to create my own version of the impossible staircase in
Pov-ray.
> Does anyone know how to work out both the horizontal and vertical
angles of
> a Perspective camera?
>

Have you tried orthographic camera yet? Didn't occur to me until I saw
a post by Rico(?) in p.b.i. I couldn't figure the maths so located
camera along -z. Then rotated it <x,y,0> by "try-it-and-see" - only
took a few minutes. Use look_at to center the object. This was for a
triangle version but guess it would be just as easy for stairs.

Alf

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