JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdn.rawgit.com/mrdoob/three.js/master/build/three.min.js"></script>

CSS

body {
	  margin: 0;
}

JavaScript

var camera, scene, renderer;
var geometry, material, mesh;

const axis = new THREE.Vector3(0,1,0);
const cameraDisplacement = new THREE.Vector3(0,0,1);
const group = new THREE.Group();
init();
animate();

function init() {

  camera = new THREE.PerspectiveCamera(70, window.innerWidth / window.innerHeight, 0.01, 10);
  camera.position.z = 2;

  scene = new THREE.Scene();

	
  
  
  geometry = new THREE.IcosahedronGeometry(1, 16);
  
  const count = geometry.attributes.position.count;
  for (let i = 0; i < count; i++) {
    const x = geometry.attributes.position.getX(i);
    if (x >= 0.7){
      geometry.attributes.position.setX(i, 1.4 - x);
    }
  }
  geometry.computeVertexNormals();
  geometry.attributes.position.needsUpdate = true;
  geometry.attributes.normal.needsUpdate = true;
  
  material = new THREE.MeshStandardMaterial({
    flatShading: true
  });
  light = new THREE.PointLight("white", 1, 0, 2);
  light.shadow.enabled = true;
  light.shadow.mapSize.width = 4096;
  light.shadow.mapSize.height = 4096;
  light.shadow.bias = -0.0002;
  light.castShadow = true;

  mesh = new THREE.Mesh(geometry, material);
  mesh.position.set(-20, 0, 0);
  mesh.rotation.set(0,-1.5,0);
  mesh.castShadow = true;
  mesh.receiveShadow = true;
  
  group.add(mesh);
  group.add(light);
  scene.add(group);

  renderer = new THREE.WebGLRenderer({
    antialias: true
  });
  renderer.setSize(window.innerWidth, window.innerHeight);
  document.body.appendChild(renderer.domElement);

	renderer.shadowMap.enabled = true;
	renderer.shadowMap.type = THREE.PCFSoftShadowMap;
}



function animate() {

  requestAnimationFrame(animate);

  mesh.position.applyAxisAngle(axis, 0.001);
  
  group.position.copy(mesh.position);
  group.position.multiplyScalar(-1);

  /* mesh.rotation.x += 0.01 */

  renderer.render(scene, camera);

}