#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

[Loop Start:11
o = o + 0.001 / abs(0.3 - h  + 0.2* cos(loop*8 + a/0.785) )
Loop End]

r = o
g = o
b = o