pixels = W:1024 H:1024

x = from 0 to 1023 W
y = from 0 to 1023 H

a = 511
b = 256

c = x - a
d = y - b

e = atan2(c, -d)
w = abs(e)
p = e*sqrt(w/(1 + w))

k = sqrt(c*c + d*d)/abs(p)

c = tex_color_fbm2(k, 100)
r = parse_red(c)
g = parse_green(c)
b = parse_blue(c)