lensing

examples/wavy.glsl

@@ -0,0 +1,22 @@
+void mainImage(out vec4 fragColor, in vec2 fragCoord) {
+    vec2 uv = fragCoord / iResolution;
+
+    vec2 lines_uv = uv;
+
+    // twist?
+    // distance from middle
+    //float distance = distance(fragCoord, vec2(0.5, 0.5));
+    float distance = distance(uv, vec2(0.5, 0.5));
+    float inverse_distance = 1.0 - distance;
+    lines_uv += (lines_uv - vec2(0.5, 0.5)) * inverse_distance * 3.0;
+
+    // The lines themselves
+    float lines_timescale = iTime * 0.6;
+    lines_uv.x += sin(lines_timescale + lines_uv.y * 30.0) * 0.2;// * sin(lines_timescale);
+    float hor_lines = sin(lines_uv.x * 10.0)/2.0 + 0.5;
+    hor_lines = sign(hor_lines -0.5);
+    //hor_lines = sin(iTime * 3.0 +hor_lines * 2.0 + uv.y / 50.0);
+
+    //fragColor = vec4(uv.x, uv.y, 1.0, 1.0);
+    fragColor = vec4(hor_lines * 0.7, inverse_distance, inverse_distance, 1.0);
+}