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

I'll have to go back to that page and see if your trick can be applied
generally.

-- 
Mike Williams
Gentleman of Leisure

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