Add polar3b.glsl

polar3b.glsl

@@ -0,0 +1,13 @@
+// variant of https://shadertoy.com/view/lt2Bzd
+
+void mainImage(out vec4 O, in vec2 u) {
+    vec2 U = u+u - iResolution.xy;
+    float T = 6.2832;
+    float l = length(U) / 30.;
+    float L = ceil(l) * 6.;
+    float a = atan(U.x,U.y) - iTime * 2.*(fract(1e4*sin(L))-.5);
+    O = .6 + .4* cos( floor(fract(a/T)*L) + vec4(0,23,21,0) )
+        - max(0., 9.* max( cos(T*l), cos(a*L) ) - 8. );
+}
+
+// https://www.shadertoy.com/view/XtjfDy