pixels = W:512 H:512

x = from 0 to 1 W
y = from 0 to 1 H

f = 20
w = smoothstep(0.1, 0.9, x)
k = xor_simplex_turbulence2(x*f, y*f)
h = x + w*k

h = h*1.5
b = pow(max(h,0), 1.5)
g = pow(max(h,0),2)*0.4
r = pow(max(h,0),3)*0.15
