If rendering the scene, make sure that dofile is set to true first time, and
false thereafter.

I've included mgrass.inc (Gilles Tran's grass include file), but you're better
off picking it up from his sight if you ain't already got it, since it comes
with a couple of samples.

--
#macro A(V,B,C,R)#while(B-256)#if(V-128/B>=0)sphere{0,.5translate<C-4R-1,9>
pigment{rgb<1-C/8R/2C/8>}}#local V=V-128/B;#end#local B=B*2;#local C=C+1;#
end#end A(234,1,0,2)A(85,1,0,1)A(81,1,0,0)light_source{-5 1}//Tom Melly

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