Quick question - 1 have 3 spheres with media SA,SB,SC and 3 light sources 
LA LB LC

sphere { 0 1 interior { miedia { scattering { ... } } } // SA 
sphere { .. .. interior { miedia { scattering { ... } } } // SB 
sphere { .. .. interior { miedia { scattering { ... } } } // SB

light_source { .. .. media_interaction on  media_attenaution on } // LA  
light_source { .. .. media_interaction on  media_attenaution on } // LB 
light_source { .. .. media_interaction on  media_attenaution on } // LC 

// global lights, not effecting media nor by media:
light_source { .. .. media_interaction off  media_attenaution off } 
light_source { .. .. media_interaction off  media_attenaution off } 


how can I make so that media in SA will scatter ONLY light from LA,
SB from LB  and  SC from  LC ?

-- 
#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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