"Norbert Kern" <nor### [at] t-onlinede> wrote in
news:web.3da626df23ad0e644b26c9670@news.povray.org 

> Take a big sphere instaed of a background {...} or a sky_sphere.
> Then you have a finish definition also to play with. But it is not
> possible to rise the ambient level and to not change the background
> color impression imho.

no,
background rgb A
sky sphere rgbf <B,B,B,f>

is same (but slower) as :
background rgb A*(f)+b*(1-f)


-- 
#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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