neurosecure/public/js/particles.js

const SEPARATION = 100,
  AMOUNTX = 50,
  AMOUNTY = 50;

let container;
let camera, scene, renderer;

let particles,
  count = 0;

let windowHalfX = window.innerWidth / 2;
let windowHalfY = window.innerHeight / 2;

init();
animate();

function init() {
  container = document.createElement("div");
  const about = document.getElementsByClassName("about")[0];
  about.appendChild(container);

  camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    500,
    10000
  );
  camera.position.z = 1000;
  camera.position.y = 250;

  scene = new THREE.Scene();
  scene.background = new THREE.Color(0x131313);

  //

  const numParticles = AMOUNTX * AMOUNTY;

  const positions = new Float32Array(numParticles * 3);
  const scales = new Float32Array(numParticles);

  let i = 0,
    j = 0;

  for (let ix = 0; ix < AMOUNTX; ix++) {
    for (let iy = 0; iy < AMOUNTY; iy++) {
      positions[i] = ix * SEPARATION - (AMOUNTX * SEPARATION) / 2; // x
      positions[i + 1] = 0; // y
      positions[i + 2] = iy * SEPARATION - (AMOUNTY * SEPARATION) / 2; // z

      scales[j] = 1;

      i += 3;
      j++;
    }
  }

  const geometry = new THREE.BufferGeometry();
  geometry.setAttribute("position", new THREE.BufferAttribute(positions, 3));
  geometry.setAttribute("scale", new THREE.BufferAttribute(scales, 1));

  const material = new THREE.ShaderMaterial({
    uniforms: {
      color: { value: new THREE.Color(0xffffff) },
    },
    vertexShader: document.getElementById("vertexshader").textContent,
    fragmentShader: document.getElementById("fragmentshader").textContent,
  });

  //

  particles = new THREE.Points(geometry, material);
  scene.add(particles);

  //

  renderer = new THREE.WebGLRenderer({ antialias: true });
  renderer.setPixelRatio(window.devicePixelRatio);
  renderer.setSize(window.innerWidth, window.innerHeight / 2);
  container.appendChild(renderer.domElement);

  container.style.touchAction = "none";

  //

  windowHalfX = window.innerWidth / 2;
  windowHalfY = window.innerHeight / 2;

  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();

  renderer.setSize(window.innerWidth, window.innerHeight);

  window.addEventListener("resize", onWindowResize);
}

function onWindowResize() {
  windowHalfX = window.innerWidth / 2;
  windowHalfY = window.innerHeight / 2;

  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();

  renderer.setSize(window.innerWidth, window.innerHeight);
}

//

function onPointerMove(event) {
  if (event.isPrimary === false) return;
}

//

function animate() {
  requestAnimationFrame(animate);

  render();
}

function render() {
  //camera.lookAt(scene.position);

  const positions = particles.geometry.attributes.position.array;
  const scales = particles.geometry.attributes.scale.array;

  let i = 0,
    j = 0;

  for (let ix = 0; ix < AMOUNTX; ix++) {
    for (let iy = 0; iy < AMOUNTY; iy++) {
      positions[i + 1] =
        Math.sin((ix + count) * 0.3) * 50 + Math.sin((iy + count) * 0.5) * 50;

      scales[j] =
        (Math.sin((ix + count) * 0.3) + 1) * 20 +
        (Math.sin((iy + count) * 0.5) + 1) * 20;

      i += 3;
      j++;
    }
  }

  particles.geometry.attributes.position.needsUpdate = true;
  particles.geometry.attributes.scale.needsUpdate = true;

  renderer.render(scene, camera);

  count += 0.1;
}