With orthographic, the distance of the camera has no effect on the apparent size
of the object. You only need to place the camera far enough so that the camera
is not inside the object.
The FOV of an ortho camera is determined solely by the up and right vectors. So
if you want a 20 unit wide object to fit the image edges exactly, you need to
set the 'right' vector to 20*x (and center the camera on the object, obviously).
Ypu also need to set the 'up' vector to 20*3/4*y to correspond to the image
aspect ratio.

-- 
Margus Ramst

Personal e-mail: mar### [at] peakeduee
TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg

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