javascript
/
three.js
镜像自地址 https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
	<title>three.js webgl - instancing - raycast</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';
	import { GUI } from './jsm/libs/dat.gui.module.js';
	import { OrbitControls } from "./jsm/controls/OrbitControls.js";

	var camera, scene, renderer, stats;

	var mesh;
	var amount = parseInt( window.location.search.substr( 1 ) ) || 10;
	var count = Math.pow( amount, 3 );

	var raycaster = new THREE.Raycaster();
	var mouse = new THREE.Vector2( 1, 1 );

	var rotationTheta = 0.1;
	var rotationMatrix = new THREE.Matrix4().makeRotationY( rotationTheta );
	var instanceMatrix = new THREE.Matrix4();
	var matrix = new THREE.Matrix4();

	init();
	animate();

	function init() {

		camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.1, 100 );
		camera.position.set( amount, amount, amount );
		camera.lookAt( 0, 0, 0 );

		scene = new THREE.Scene();

		var light = new THREE.HemisphereLight( 0xffffff, 0x000088 );
		light.position.set( - 1, 1.5, 1 );
		scene.add( light );

		var light = new THREE.HemisphereLight( 0xffffff, 0x880000, 0.5 );
		light.position.set( - 1, - 1.5, - 1 );
		scene.add( light );

		var geometry = new THREE.SphereBufferGeometry( 0.5 );
		var material = new THREE.MeshPhongMaterial( { flatShading: true } );

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

		var i = 0;
		var offset = ( amount - 1 ) / 2;

		var transform = new THREE.Object3D();

		for ( var x = 0; x < amount; x ++ ) {

			for ( var y = 0; y < amount; y ++ ) {

				for ( var z = 0; z < amount; z ++ ) {

					transform.position.set( offset - x, offset - y, offset - z );
					transform.updateMatrix();

					mesh.setMatrixAt( i ++, transform.matrix );

				}

			}

		}

		scene.add( mesh );

		//

		var gui = new GUI();
		gui.add( mesh, 'count', 0, count );

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

		new OrbitControls( camera, renderer.domElement );

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

		window.addEventListener( 'resize', onWindowResize, false );
		document.addEventListener( 'mousemove', onMouseMove, false );

	}

	function onWindowResize() {

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

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

	}

	function onMouseMove( event ) {

		event.preventDefault();

		mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
		mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;

	}

	function animate() {

		requestAnimationFrame( animate );

		render();

	}

	function render() {

		raycaster.setFromCamera( mouse, camera );

		var intersection = raycaster.intersectObject( mesh );

		if ( intersection.length > 0 ) {

			mesh.getMatrixAt( intersection[ 0 ].instanceId, instanceMatrix );
			matrix.multiplyMatrices( instanceMatrix, rotationMatrix );

			mesh.setMatrixAt( intersection[ 0 ].instanceId, matrix );
			mesh.instanceMatrix.needsUpdate = true;

		}

		renderer.render( scene, camera );

		stats.update();

	}

</script>

</body>
</html>