JSFiddle - React, Tailwind, and code Playground

by grano

HTML

<script src="//cdn.rawgit.com/mrdoob/three.js/master/build/three.min.js"></script>
<script src="https://threejs.org/examples/js/controls/OrbitControls.js"></script>
<script>

THREE.Reflector = function ( geometry, options ) {

	THREE.Mesh.call( this, geometry );

	this.type = 'Reflector';

	var scope = this;

	options = options || {};

	var color = ( options.color !== undefined ) ? new THREE.Color( options.color ) : new THREE.Color( 0x7F7F7F );
	var textureWidth = options.textureWidth || 512;
	var textureHeight = options.textureHeight || 512;
	var clipBias = options.clipBias || 0;
	var shader = options.shader || THREE.Reflector.ReflectorShader;
	var recursion = options.recursion !== undefined ? options.recursion : 0;

	//

	var reflectorPlane = new THREE.Plane();
	var normal = new THREE.Vector3();
	var reflectorWorldPosition = new THREE.Vector3();
	var cameraWorldPosition = new THREE.Vector3();
	var rotationMatrix = new THREE.Matrix4();
	var lookAtPosition = new THREE.Vector3( 0, 0, - 1 );
	var clipPlane = new THREE.Vector4();
	var viewport = new THREE.Vector4();

	var view = new THREE.Vector3();
	var target = new THREE.Vector3();
	var q = new THREE.Vector4();

	var textureMatrix = new THREE.Matrix4();
	var virtualCamera = new THREE.PerspectiveCamera();

	var parameters = {
		minFilter: THREE.LinearFilter,
		magFilter: THREE.LinearFilter,
		format: THREE.RGBFormat,
		stencilBuffer: false
	};

	var renderTarget = new THREE.WebGLRenderTarget( textureWidth, textureHeight, parameters );
	
	renderTarget.depthBuffer = true;
	renderTarget.depthTexture = new THREE.DepthTexture();
	renderTarget.depthTexture.type = THREE.UnsignedShortType;

	if ( ! THREE.Math.isPowerOfTwo( textureWidth ) || ! THREE.Math.isPowerOfTwo( textureHeight ) ) {

		renderTarget.texture.generateMipmaps = false;

	}

	var material = new THREE.ShaderMaterial( {
		uniforms: THREE.UniformsUtils.clone( shader.uniforms ),
		fragmentShader: shader.fragmentShader,
		vertexShader:...

CSS

body {
	  margin: 0;
}

JavaScript

let camera, scene, renderer;

init();
animate();

function init() {

    camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.01, 20 );
    camera.position.set( 0, 3, 3 );

    scene = new THREE.Scene();
		
		//

    const boxGeometry = new THREE.BoxGeometry();
    const boxMaterial = new THREE.MeshNormalMaterial();

    const box = new THREE.Mesh( boxGeometry, boxMaterial );
    scene.add( box );
		
		//
		
		const reflectorGeometry = new THREE.PlaneBufferGeometry( 8, 8 );
		const reflector = new THREE.Reflector( reflectorGeometry, {
			textureWidth: 1024 * window.devicePixelRatio,
			textureHeight: 1024 * window.devicePixelRatio,
			color: 0x889999,
			recursion: 1
		} );
		
		reflector.rotation.x = Math.PI * - 0.5;
		reflector.position.y = - 1;
		
		scene.add( reflector );
		
    renderer = new THREE.WebGLRenderer( { antialias: true } );
		renderer.setPixelRatio( window.devicePixelRatio );
    renderer.setSize( window.innerWidth, window.innerHeight );
    document.body.appendChild( renderer.domElement );
		
		const controls = new THREE.OrbitControls( camera, renderer.domElement );

}

function animate() {

    requestAnimationFrame( animate );
    renderer.render( scene, camera );

}