Wasn't it Orchid XP v3 who wrote:
>>> (I read somewhere that dividing your function by a big number makes 
>>> max_gradient lower, but doesn't make it trace any faster. But this trick 
>>> makes the big numbers small, but leaves the small numbers alone so 
>>> POV-Ray doesn't go around taking tiny steps there any more.)
>> 
>> That sounds like me
>> 
>> http://www.econym.demon.co.uk/isotut/dont.htm
>
>Yeah.
>
>Ooo... "you can't use arrays in an isosurface function". Um... well... I 
>just did. :-.

I don't say you can't use arrays. I say 

  You can't index an array inside an isosurface function.

  You can use individual fixed elements of an array, like A[3] but you 
  can't use the function variables to index the array like A[floor(x)].

  However, you can do this:
  http://www.econym.demon.co.uk/isotut/arrays.htm

-- 
Mike Williams
Gentleman of Leisure

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