Three.js Distorted Plane Shader

:root {
  --bg: #04070f;
  --text: #eef4ff;
  --muted: #c2d0e7;
  --accent: #8ce8ff;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}
#scene {
  position: fixed;
  inset: 0;
}
.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: .75rem 1rem;
  background: rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(8px);
}
.topbar a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
}
button {
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--text);
  padding: .45rem .8rem;
  cursor: pointer;
}
.overlay {
  position: relative;
  z-index: 10;
  min-height: 100vh;
  width: min(900px, 92%);
  margin: 0 auto;
  display: grid;
  align-content: center;
  gap: .7rem;
  text-align: center;
}
.label {
  margin: 0;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
}
h1,
p {
  margin: 0;
}
h1 {
  font-size: clamp(2rem, 7vw, 4.2rem);
}
p {
  color: var(--muted);
}

if (!window.MotionPreference) {
  const __mql = window.matchMedia("(prefers-reduced-motion: reduce)");
  const __listeners = new Set();

  const MotionPreference = {
    prefersReducedMotion() {
      return __mql.matches;
    },
    setOverride(value) {
      const reduced = Boolean(value);
      document.documentElement.classList.toggle("reduced-motion", reduced);
      window.dispatchEvent(new CustomEvent("motion-preference", { detail: { reduced } }));
      for (const listener of __listeners) {
        try {
          listener({ reduced, override: reduced, systemReduced: __mql.matches });
        } catch {}
      }
    },
    onChange(listener) {
      __listeners.add(listener);
      try {
        listener({
          reduced: __mql.matches,
          override: null,
          systemReduced: __mql.matches,
        });
      } catch {}
      return () => __listeners.delete(listener);
    },
    getState() {
      return { reduced: __mql.matches, override: null, systemReduced: __mql.matches };
    },
  };

  window.MotionPreference = MotionPreference;
}

import * as THREE from "three";

const host = document.getElementById("scene");
const toggle = document.getElementById("toggleMotion");
let motionEnabled = !window.MotionPreference.prefersReducedMotion();

const scene = new THREE.Scene();
const camera = new THREE.OrthographicCamera(-1, 1, 1, -1, 0.1, 10);
camera.position.z = 1;

const renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setPixelRatio(Math.min(window.devicePixelRatio || 1, 2));
renderer.setSize(window.innerWidth, window.innerHeight);
host.appendChild(renderer.domElement);

const uniforms = {
  uTime: { value: 0 },
  uResolution: { value: new THREE.Vector2(window.innerWidth, window.innerHeight) },
};

const material = new THREE.ShaderMaterial({
  uniforms,
  vertexShader: `
    varying vec2 vUv;
    void main() {
      vUv = uv;
      gl_Position = vec4(position, 1.0);
    }
  `,
  fragmentShader: `
    precision highp float;
    varying vec2 vUv;
    uniform float uTime;
    uniform vec2 uResolution;

    float noise(vec2 p){
      return sin(p.x) * sin(p.y);
    }

    void main() {
      vec2 uv = vUv;
      vec2 p = (uv - 0.5) * vec2(uResolution.x / uResolution.y, 1.0);
      float t = uTime * 0.25;

      float wave = sin(p.x * 3.2 + t) * 0.12 + cos(p.y * 2.4 - t * 1.2) * 0.1;
      vec2 q = p + vec2(wave, wave * 0.7);

      float d = length(q);
      float glow = 0.25 / (d + 0.12);
      float grain = noise(q * 8.0 + t);

      vec3 col = vec3(0.03, 0.05, 0.12);
      col += vec3(0.15, 0.32, 0.55) * glow;
      col += vec3(0.35, 0.18, 0.6) * max(0.0, sin(q.x * 6.0 + t));
      col += grain * 0.015;

      gl_FragColor = vec4(col, 1.0);
    }
  `,
});

const quad = new THREE.Mesh(new THREE.PlaneGeometry(2, 2), material);
scene.add(quad);

function setLabel() {
  toggle.textContent = motionEnabled ? "Disable motion" : "Enable motion";
}

function animate() {
  requestAnimationFrame(animate);
  if (motionEnabled) uniforms.uTime.value += 0.016;
  renderer.render(scene, camera);
}

function onResize() {
  renderer.setSize(window.innerWidth, window.innerHeight);
  uniforms.uResolution.value.set(window.innerWidth, window.innerHeight);
}

toggle.addEventListener("click", () => {
  motionEnabled = !motionEnabled;
  setLabel();
});

window.addEventListener("resize", onResize);
setLabel();
animate();

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Demo 10 - Distorted Plane Shader</title>
    <link rel="stylesheet" href="style.css" />
    <script type="importmap">{"imports":{"gsap":"https://esm.sh/gsap@3.13.0","gsap/ScrollTrigger":"https://esm.sh/gsap@3.13.0/ScrollTrigger","gsap/SplitText":"https://esm.sh/gsap@3.13.0/SplitText","gsap/Flip":"https://esm.sh/gsap@3.13.0/Flip","gsap/ScrambleTextPlugin":"https://esm.sh/gsap@3.13.0/ScrambleTextPlugin","gsap/TextPlugin":"https://esm.sh/gsap@3.13.0/TextPlugin","gsap/all":"https://esm.sh/gsap@3.13.0/all","gsap/":"https://esm.sh/gsap@3.13.0/","lenis":"https://esm.sh/lenis@1.1.13/dist/lenis.mjs","three":"https://esm.sh/three@0.171.0","three/addons/":"https://esm.sh/three@0.171.0/examples/jsm/"}}</script>
</head>
  <body>
    <header class="topbar">
      <a href="../">Back to demos</a>
      <button id="toggleMotion"></button>
    </header>
    <div id="scene"></div>
    <section class="overlay">
      <p class="label">Demo 10</p>
      <h1>Distorted Plane Shader</h1>
      <p>Animated shader background baseline for cinematic hero sections.</p>
    </section>

    <script type="module" src="script.js"></script>
      </body>
</html>