Zickzack

void mainImage( out vec4 fragColor, in vec2 fragCoord ) { vec2 uv = fragCoord / iResolution.y, s = vec2(.0),c = vec2(.0);
vec2 f = fragCoord.xy; float k = uv.x; float t = iTime * 0.3; t+=sin(t10.)0.1; f.y += 233.0; float d = floor(uv.x * 10.0) + 0.5; f.y+=uv.x5000.0(floor(mod(d,2.0)-1.0)+0.5); float g = d * 20.0; f.y += 1233.0 * g * t*.05; k = sin(f.y / g); k = floor(k+1.0); fragColor = vec4(k); }