#https://www.shadertoy.com/view/llj3zW

pixels = W:1024 H:1024

x = from -3.6 to 3.6 W
y = from -3.6 to 3.6 H

l = length2(x, y)
f = 0.1
a = 3.0
t = 52.2654
c = floor(mod(t*0.1+2.0,10.0))/15.0 + 0.55

u = x
v = y

d = u*u + v*v
u = abs(u)/d - c
v = abs(v)/d - c

d = u*u + v*v
u = abs(u)/d - c
v = abs(v)/d - c

d = u*u + v*v
u = abs(u)/d - c
v = abs(v)/d - c

d = u*u + v*v
u = abs(u)/d - c
v = abs(v)/d - c

k = length2(u, v) - abs(1.0-mod(atan2(u,v)*6.0+t, 2.0))

r = k
g = k
b = k
