Normally, I prefer the other way round: First create a scene with a 
dummy object in it (like box { <-1,-1,-1>,<1,1,1> }) and manually adjust 
your camera so that this object is captured as you want.
Now if you want to create a picture of another object, pick it's largest 
extremity and scale the whole object by 1/extremity, so that it fits 
inside the object you calibrated the camera for.


HTH,
Florian
-- 
camera{look_at-y*10location<8,-3,-8>*10}#local a=0;#while(a<999)sphere{
#local _=.01*a-4.99;#local p=a*.01-5;#local c=.01*a-4.995;<sin(p*pi)*5p
*10pow(p,5)*.01>sin(c*c*c*.1)+1pigment{rgb 3}}#local a=a+1;#end
/******** http://www.torfbold.com ******** http://www.imp.org ********/

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