James Taylor wrote:
> 
> Thanks, Charles, I'll file that away if I need it in the future.
> 
> I have however managed to achieve the effect by using a camera with a long
> "zoom" lens. ie placing the camera about a mile from the scene and then
> using a very narrow angle.

Yup. That'll work, for mostly the same reason the orthographic camera
works.
At that focal length, the rays are so close to parallel as could fool a
a moderately dumb protractor. *sigh* Guess I was overthinking the
problem.
Glad it worked out. 

-- 
@C[$F];
The Silver Tome ::  http://www.silvertome.com 
"You may sing to my cat if you like..."

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