tunnel demo

src/shaders/fragment.glsl

@@ -0,0 +1,36 @@
+varying vec2 vUv;
+uniform float time;
+uniform sampler2D u_texture;
+
+// https://www.shadertoy.com/view/4djSRW
+float hash12(vec2 p){
+  vec3 p3  = fract(vec3(p.xyx) * .1031);
+  p3 += dot(p3, p3.yzx + 33.33);
+  return fract((p3.x + p3.y) * p3.z);
+}
+
+void main() {
+  vec2 uv = vUv;
+
+  uv.x *= 3.142596;
+
+  const float numbers = 9.0;
+
+  vec2 repeat = vec2(6.0, 12.0);
+
+  vec2 cell = (uv * repeat);
+
+  cell.x *= numbers;
+  cell = floor(cell);
+
+  float rand = 100.0 * hash12(cell);
+
+  float offset = mod(floor(time + rand), numbers) / numbers;
+  uv = fract(uv * repeat);
+  uv.x = fract(uv.x + offset);
+
+  vec4 color = texture2D(u_texture, uv);
+
+  color -= 0.05 * vec4(vec3(rand), 1.0);
+  gl_FragColor = color;
+}

src/shaders/vertex.glsl

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+varying vec2 vUv;
+uniform float time;
+
+
+void main() {
+vUv = uv;
+
+gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
+}