<manual>
6.11.11.2.12  Normal and Radiosity
Radiosity estimation can be affected by normals. To enable this feature, 
add normal on to the radiosity{} block. The default is off
</manual>

In with way normals do affect radiosity? Where can I find more detailed 
explanation of how some options/algorithms work (how they work in phisics 
model, and how they are computed by Pov) - apart from source code?

-- 
#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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