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HTML 

              
                <html lang="fr">
	<head>
		<title>three.js webgl - gravitation</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
    
    <style>
		body { margin: 0; touch-action: none;}
		canvas { width: 100%; height: 100% ; touch-action: none;}
	</style>
		
		<script type="module">
			import * as THREE from 'https://threejs.org/build/three.module.js';
			import { OrbitControls } from 'https://threejs.org/examples/jsm/controls/OrbitControls.js';

			let camera, controls, scene, renderer;
            
            var clock;
            var sphere;
            var satellite;

			init();
			animate();

			function init()
            {
                //clock
                clock = new THREE.Clock();
                
				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xcccccc );
				scene.fog = new THREE.FogExp2( 0xcccccc, 0.001 );

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

				camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 2000 );
				camera.position.set( 10, 5, 0 );

                // controls

                controls = new OrbitControls( camera, renderer.domElement );
                controls.enableDamping = true; // an animation loop is required when either damping or auto-rotation are enabled
                controls.dampingFactor = 0.05;

                controls.maxPolarAngle = Math.PI / 2;

				// sphere
                const geometry = new THREE.SphereGeometry( 1, 32, 32 );
				const material = new THREE.MeshPhongMaterial( { color: 0xffffff, flatShading: false } );
                sphere = new THREE.Mesh( geometry, material );
                scene.add( sphere );
                
                //satelite
                const geometry_satelite = new THREE.BoxGeometry( 0.4, 0.4, 0.4 );
				const material_satelite = new THREE.MeshNormalMaterial( {  flatShading: true } );
                satellite = new THREE.Mesh( geometry_satelite, material_satelite );
                scene.add( satellite );
                
                //FLOOR
                const planeSize = 10;

                const planeGeo = new THREE.PlaneGeometry(planeSize, planeSize);
                const planeMat = new THREE.MeshPhongMaterial({color : 0XEEEEEE ,side: THREE.DoubleSide});
                const mesh = new THREE.Mesh(planeGeo, planeMat);
                mesh.rotation.x = Math.PI/2;
                mesh.position.y = -1;
                scene.add(mesh);
				

				// lights

				const dirLight1 = new THREE.DirectionalLight( 0xffffff );
				dirLight1.position.set( 1, 1, 1 );
				scene.add( dirLight1 );

				const dirLight2 = new THREE.DirectionalLight( 0x002288 );
				dirLight2.position.set( - 1, - 1, - 1 );
				scene.add( dirLight2 );

				const ambientLight = new THREE.AmbientLight( 0x222222 );
				scene.add( ambientLight );

				//

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

			function onWindowResize()
            {
				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();
				renderer.setSize( window.innerWidth, window.innerHeight );
			}

			function animate()
            {
                //time tracking
                var delta = clock.getDelta();
			    var elapsed = clock.elapsedTime;
                
                //sphere position
                sphere.position.x = Math.sin(elapsed/2) * 3;
                sphere.position.z = Math.cos(elapsed/2) * 3;
                
                //satellite
                satellite.position.x =  sphere.position.x + Math.sin(elapsed*2) * 2;
                satellite.position.z = sphere.position.z + Math.cos(elapsed*2) * 2;
                satellite.rotation.x += 0.4 * delta;
                satellite.rotation.y += 0.2 * delta;
                
				requestAnimationFrame( animate );
				controls.update(); // only required if controls.enableDamping = true, or if controls.autoRotate = true
				renderer.render( scene, camera );
			}

		</script>
    </head>
  	<body>
	</body>
</html>
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