"If you set fade_power in the interior of an object at 1000 or above, a 
realistic exponential attenuation function will be used"

I didnt find more explanation in mannual - why this new forumla is more 
realistic, witch real-word materials have it, is this the best attenuation
forumla - or is it still not perfect in compare to phisics rights ?
How choose fade_power ? 1000 ? 1500 ? 10000 ? 
Should we always use new attenuation, or do some object look more realistic 
with old formula ?

-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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