javascript
/
three.js
spogulis no https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - instancing</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<link type="text/css" rel="stylesheet" href="main.css">
	</head>
	<body>

		<script type="module">

			import * as THREE from '../build/three.module.js';

			import Stats from './jsm/libs/stats.module.js';

			var camera, scene, renderer, stats;

			var mouseX = 0, mouseY = 0;

			var windowHalfX = window.innerWidth / 2;
			var windowHalfY = window.innerHeight / 2;

			init();
			animate();

			function init() {

				camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.1, 100 );
				camera.position.z = 25;

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xffffff );

				var geometry = new THREE.BoxBufferGeometry( 1, 1, 1 );
				var material = new THREE.MeshNormalMaterial();

				var count = 10000;

			 	var mesh = new THREE.InstancedMesh( geometry, material, count );

				var dummy = new THREE.Object3D();

				for ( var i = 0; i < count; i ++ ) {

					dummy.position.set(
						Math.random() * 20 - 10,
						Math.random() * 20 - 10,
						Math.random() * 20 - 10
					);

					dummy.rotation.set(
						Math.random() * Math.PI,
						Math.random() * Math.PI,
						Math.random() * Math.PI
					);

					dummy.updateMatrix();

					mesh.setMatrixAt( i, dummy.matrix );

				}

				scene.add( mesh );

				//

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

				//

				stats = new Stats();
				document.body.appendChild( stats.dom );

				//

				document.addEventListener( 'mousemove', onDocumentMouseMove, false );

				//

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

			}

			function onWindowResize() {

				windowHalfX = window.innerWidth / 2;
				windowHalfY = window.innerHeight / 2;

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function onDocumentMouseMove( event ) {

				mouseX = ( event.clientX - windowHalfX ) / 10;
				mouseY = ( event.clientY - windowHalfY ) / 10;

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();
				stats.update();

			}

			function render() {

				var time = Date.now() * 0.001;

				var rx = Math.sin( time * 0.7 ) * 0.5,
					ry = Math.sin( time * 0.3 ) * 0.5,
					rz = Math.sin( time * 0.2 ) * 0.5;

				camera.position.x += ( mouseX - camera.position.x ) * 0.05;
				camera.position.y += ( - mouseY - camera.position.y ) * 0.05;

				camera.lookAt( scene.position );

				var mesh = scene.children[ 0 ];
				mesh.rotation.x = rx;
				mesh.rotation.y = ry;
				mesh.rotation.z = rz;

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>