To get the same world pseudorandom numbers rand() are used.
var r1 = .1, r2 = .231343, r3 = -.321346, world = 1; for(var i = 0; i < world; i++ ) rand(); // "randomization" ... function rand(){ r1 = r1*r1 - 2; r2 = r2*r2 - 2; r3 = r3*r3 - 2; return r1 + r2 + r3; }