/* 
A variant of lunabunny's (lunabunny(at)hotmail.com) Concentricity.  
*/

Aspc="1",

A0="(trnc(rnd(17))+4)*pi",             //  # of rings (* 2)
A1="(0.01+rnd(0.09))*sgn(rnd(1)-.5)",  //  rotation velocity
A2="trnc(rnd(2))*pi",                  //  phase shifter
A3="sgn(rnd(1)-.5)*.01",               //  background in or out

D0="sin(a0*r+a2)",

srcR="r+a3*(sgn(-d0)*.5+.5)",
srcT="theta+a1*pos(d0)",

Vers=200

// From Ted

