#https://www.shadertoy.com/view/4sKSzz

pixels = W:1024 H:1024

x = from -1.2 to 1.2 W
y = from -1.2 to 1.2 H

h = length2(x, y)

k = pow(exp(1), -pow(h, 12))

r = k*(1 - h*h)
g = k*(1 - h)
b = k*h*h
