#https://www.shadertoy.com/view/ldX3Rr

pixels = W:1024 H:1024

x = from -1.1 to 1.1 W
y = from -1.1 to 1.1 H

h = square_sum2(x, y)
d = abs(y) - h
a = d-0.23
b = h-1.00
c = sign(a*b*(y+x + (y-x)*sign(d)))		
c = mix( c, 0.0, smoothstep(0.98,1.00,h) )
c = mix( c, 0.6, smoothstep(1.00,1.02,h) )

r = c
g = c
b = c
	


