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

pixels = W:1024 H:1024

x = from 0 to 8 W
y = from 0 to 8 H

t = 2.31
k = 0

[Loop Start:10
i = 0.1 + loop*0.1
v = 1.0 - cos(6.3*i)
r = 0.5 + 0.5*sin(0.3*t)
h = length2( fract( x/i - t*i ) - 0.5, fract( y/i - t*i ) - 0.5 )
k = k + smoothstep(-v,v, sin(60.0*r*h)-0.8) * (i - k)
Loop End]

r = k
g = k
b = k
