#https://www.shadertoy.com/view/4dc3DM

pixels = W:1024 H:1024

x = from -0.54 to 0.54 W
y = from -0.54 to 0.54 H

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

o =  0.0032/ abs(0.3 - h  + 0.2*cos(a*12) )

r = o
g = o
b = o