Harold Baize wrote:
> 
> > at x*-50 then the rule of thumb would give a camera separation of 1.6667
> 
> Sorry, I meant z*-50.

Don't be. The camera separation would be the same :) Here's my cam:
camera {
   #local L=28;
   #local Pos=<-45 , 12 ,-30>*.7;
   location  Pos + vnormalize(vcross(Pos,y))*clock
   look_at   <0, 0 , -2>
   angle degrees(atan2(35,L))
}
The target is at <0,0,0> and it's normal is -x. On closer inspection,
the camera distance is 39 units and the target radius is 15, so the "one
unit for every 30 units" rule is actually fulfilled. 
Can this rule be derived from the focal length of the human eye or
something?

sig.

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