pixels = W:1024 H:1024

x = from -1 to 1.0 W
y = from -1 to 1.0 H

a = atan2(y, x)
d = length2(x, y)

k = 9.0
m = 0.1
x1 = x + cos((a - d)*k + x + k)*m
y1 = y + cos((a - d)*k + y + k)*m

s = 10
r = xor_worley2d(x1*s, y1*s)
g = r
b = r
