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But I still got problem with that animation (in with i'm using media).

It looks like a bug.

I want to create "artist image" of atom with gamma radiation, gamma quants 
are visualized as small sparly "stars".

Sparky is made of an sphere with scattering media with light source in 
center of it. Light source is sorrounded with small sphere made of solid 
material, with holes - that creates nice rays.

Everything is ok, until I put several sparkys close to each other, then 
sometimes it looks like one scattering-sphere is clipped by scattering-
sphere of another sparky. With looks like a bug, since each 2 spheres 
(scattering media sphere + blocking sphere with holes) plus 1 light source 
are in indiwidual light groups.

light_group { 
  sphere { scattering media ... } 
  sphere { solid, with holes in it }
  light_source { }
}

light_group { 
  sphere { scattering media ... } 
  sphere { solid, with holes in it }
  light_source { }
}

any suggestions? I will poste in .b.i some examples soon




-- 
#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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