"hughes, b." <omn### [at] charternet> wrote in
news:3d9cb81f@news.povray.org 

> light_group {/*Lights And Isosurface*/}
> plane {y,0 pigment {rgb 1} finish {ambient 1 diffuse 0}}

thanks :)
 
> I'd guess that diffuse has nothing to do with shadows. But only a
> guess.

Object with diffuse 0.0 will always diffuse color rgb 0 light (no light), 
no difference is it standing in front of strong light_source, or is it 
hidden behind some object (that would cause shadow).


-- 
#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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