#http://baike.baidu.com/view/301886.htm?fr=ala0_1_1
#繭孵盄腔憤釴梓源最峈:老=a* sin(n牟),老=a*cos(n牟)
#蚚眻褒釴梓源最桶尨峈: x=a* sin(n牟)* cos(牟), y=a*sin(n牟)* sin(牟)

vertices = 18000
t = from 0 to (2*PI)
a = rand_int2(2, 50)
x = sin(a*t)*cos(t)
y = sin(a*t)*sin(t)

r = 10;
x = x*r
y = y*r
