light_source{<1500,2000,-2500> color Yellow*0.7}
   light_source{<-100, 100,-200> color Yellow*0.7}
   light_source{<0,-1,10> color rgb <1,1,1>}
   background {color rgb <0,0,0>}

#macro Sp(x0,y0,z0,r0)
    sphere {<x0,y0,z0>   , r0
               pigment {Gold }
               finish { reflection .5 phong .7 }} 
#end

#macro Spp(x0,y0,z0,r0)
    sphere {<x0,y0,z0>   , r0
             pigment{Silver} 
             finish { reflection .5 phong .7 }}
#end