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Yes, it isn't a spiral, but it works fine. I made this from your code:
#declare Spread = .1;
#declare mintheta = 0;
#declare maxtheta = pi/3;
camera { location <-4,1,-6>*.5 look_at 0 angle 35 }
light_source { <50,100,-200> 1 }
cylinder { 0,z,.02 pigment { rgb x+y } finish { specular .5 } }
cylinder
{ 0,z,.02 rotate x*degrees(maxtheta)
pigment { rgb y+z } finish { specular .5 }
}
#declare dtheta = atan2(Spread,1);
#declare R=seed(0);
#declare theta=mintheta;
#while(theta<maxtheta)
#if(theta=0)
#declare dphi=2*pi;
#else
#declare dphi=dtheta/sin(theta);
#end
#declare minphi= -pi + dphi*rand(R)*.5;
#declare maxphi= pi - dphi/2 + (minphi+pi);
#declare phi=minphi;
#while(phi<maxphi)
sphere
{ z,.05
rotate x*degrees(theta)
rotate z*degrees(phi)
pigment { rgb x } finish { specular .5 }
}
#declare phi=phi+dphi;
#end
#declare theta=theta+dtheta;
#end
--
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/
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