Actually.. It might be nice to have such a definition built in, but I 
would make it so that you have a default set of associations, but you can 
specify in the SDL a different value for one of them and have POV-Ray 
adjust all the rest to fit. The one thing Alan seems to have completely 
overlooked is that when you start dealing with something beyond a certain 
scale, either too small or two big, then the decimal places needed to 
deal with it become to imprecise to get it to work right. You need to 
have some way to adjust the scale so that if you are dealing with 
something on microscopic scales or solar system ones you can set your 
'base' 1 unit scale at some reasonable level where precision errors won't 
screw up the scene (or make it flat out impossible).


-- 
void main () {

    call functional_code()
  else
    call crash_windows();
}

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