JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdn.jsdelivr.net/npm/[email protected]/build/three.js"></script>

CSS

body {
	  margin: 0;
}

JavaScript

let camera, scene, renderer;
			let mesh;
			const AMOUNT = 2;

			init();
			animate();

			function init() {

				const ASPECT_RATIO = window.innerWidth / window.innerHeight;

				const WIDTH = ( window.innerWidth / AMOUNT ) * window.devicePixelRatio;
				const HEIGHT = ( window.innerHeight / AMOUNT ) * window.devicePixelRatio;

				const cameras = [];

				for ( let y = 0; y < AMOUNT; y ++ ) {

					for ( let x = 0; x < AMOUNT; x ++ ) {

						const subcamera = new THREE.PerspectiveCamera( 40, ASPECT_RATIO, 0.1, 10 );
						subcamera.viewport = new THREE.Vector4( Math.floor( x * WIDTH ), Math.floor( y * HEIGHT ), Math.ceil( WIDTH ), Math.ceil( HEIGHT ) );
						subcamera.position.x = ( x / AMOUNT ) - 0.5;
						subcamera.position.y = 0.5 - ( y / AMOUNT );
						subcamera.position.z = 1.5;
						subcamera.position.multiplyScalar( 2 );
						subcamera.lookAt( 0, 0, 0 );
						subcamera.updateMatrixWorld();
						cameras.push( subcamera );

					}

				}

				camera = new THREE.ArrayCamera( cameras );
				camera.position.z = 3;

				scene = new THREE.Scene();

				scene.add( new THREE.AmbientLight( 0x222244 ) );

				const light = new THREE.DirectionalLight();
				light.position.set( 0.5, 0.5, 1 );
				light.castShadow = true;
				light.shadow.camera.zoom = 4; // tighter shadow map
				scene.add( light );

				const geometryBackground = new THREE.PlaneGeometry( 100, 100 );
				const materialBackground = new THREE.MeshPhongMaterial( { color: 0x000066 } );

				const background = new THREE.Mesh( geometryBackground, materialBackground );
				background.receiveShadow = true;
				background.position.set( 0, 0, - 1 );
				scene.add( background );

				const geometryCylinder = new THREE.CylinderGeometry( 0.5, 0.5, 1, 32 );
				const materialCylinder = new THREE.MeshPhongMaterial( { color: 0xff0000 } );

				mesh = new THREE.Mesh( geometryCylinder, materialCylinder );
				mesh.castShadow = true;
				mesh.receiveShadow = true;
				scene.add( mesh );
       ...