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CSS

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JavaScript

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HTML
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CSS 

              
                body{
  overflow: hidden;
  margin: 0;
}
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JS 

              
                import * as THREE from "https://cdn.skypack.dev/three@0.136.0";
console.clear();

let scene = new THREE.Scene();

let aspect = innerWidth / innerHeight;
let frustumSize = 35;
let camera = new THREE.OrthographicCamera( frustumSize * aspect / - 2, frustumSize * aspect / 2, frustumSize / 2, frustumSize / - 2, 1, 1000 );
camera.position.set(0, 0, 10);

let renderer = new THREE.WebGLRenderer();
renderer.setClearColor(0x7f77f7);
renderer.setSize(innerWidth, innerHeight);

document.body.appendChild(renderer.domElement);
window.addEventListener("resize", event => {
  aspect = innerWidth / innerHeight;

  camera.left = - frustumSize * aspect / 2;
  camera.right = frustumSize * aspect / 2;
  camera.top = frustumSize / 2;
  camera.bottom = - frustumSize / 2;

  camera.updateProjectionMatrix();

	renderer.setSize( innerWidth, innerHeight );
})

let sceneObjs = [];
let back = new THREE.Mesh(new THREE.PlaneGeometry(200, 200), new THREE.MeshBasicMaterial({color: 0x7fffff}));
let plane = new THREE.Mesh(new THREE.PlaneGeometry(10, 20), new THREE.MeshBasicMaterial({color: 0xff7f7f}));
let penta = new THREE.Mesh(new THREE.CircleGeometry(2, 5), new THREE.MeshBasicMaterial({color: 0x7fcc7f}));
penta.position.x = -10;
let circle = new THREE.Mesh(new THREE.CircleGeometry(4, 72), new THREE.MeshBasicMaterial({color: 0xeeee7f}));
circle.position.x = 10;
sceneObjs.push(back, plane, penta, circle);

[plane, penta, circle].forEach(f => {f.position.z = 1});

sceneObjs.forEach((so, idx) => {


    so.material.onBeforeCompile = shader => {

      shader.vertexShader = `
        varying vec4 vPos;
        varying vec4 vCenter;
        ${shader.vertexShader}
      `.replace(
        `#include <begin_vertex>`,
        `#include <begin_vertex>
          vPos = modelMatrix * vec4(position, 1.);
          vCenter = modelMatrix * vec4(0);
        `
      );
      //console.log(shader.vertexShader);
      shader.fragmentShader = `
        #define ss(a, b, c) smoothstep(a, b, c)
        varying vec4 vPos;
        varying vec4 vCenter;
        ${shader.fragmentShader}
      `.replace(
        `vec4 diffuseColor = vec4( diffuse, opacity );`,
        `
        vec3 col = diffuse; //
        vec3 dir = normalize(vec3(1, -1, 0));
        float dist = fract(dot(vPos.xyz * 2., dir));
        float fw = length(fwidth(vPos.xy));
        float f = ss(0.35 - fw, 0.35, dist) - ss(0.65, 0.65 + fw, dist);
        col = mix(col + 0.125, col * 0.875, f);
        vec4 diffuseColor = vec4( col, opacity );
        `
      )
      console.log(shader.fragmentShader);
    }

})

scene.add(back, plane, penta, circle);

let clock = new THREE.Clock();

renderer.setAnimationLoop(() => {
  let t = clock.getElapsedTime();
  plane.rotation.z = Math.sin(t) * 0.1;
  penta.rotation.z = t;
  circle.position.x = 12 + Math.sin(t);
  renderer.render(scene, camera);
})
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999px

Console