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threejs-project
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case-015-1.html

<!DOCTYPE html>
<html>
	<head>
		<title>Threejs实现引入工厂模型，去除多余草地</title>
		<meta charset="UTF-8">
		<script type="text/javascript" src="libs/statistics.js"></script>
		<script type="text/javascript" src="libs/steak.js"></script>
		<script type="text/javascript" src="libs/three.js"></script>
		<script type="text/javascript" src="libs/OrbitControls.js"></script>
		<script type="text/javascript" src="libs/OBJLoader.js"></script>
		<script type="text/javascript" src="libs/MTLLoader.js"></script>
		<style>
			body {
				margin: 0;
				overflow: hidden;
			}
		</style>
		<link href='libs/nprogress.css' rel='stylesheet' />
	</head>
	<body>
		<div id="dom"></div>
		<script type="text/javascript">
			var camera;
			var renderer;
			var mesh = [];

			function init() {
				// 创建一个场景，它将包含我们所有的元素，如物体，相机和灯光。
				var scene = new THREE.Scene();

				var cubeLoader = new THREE.CubeTextureLoader();

				// 创建一个摄像机，它定义了我们正在看的地方
				camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);
				// 将摄像机对准场景的中心
				camera.position.x = 10;
				camera.position.y = 50;
				camera.position.z = 90;
				camera.lookAt(scene.position);
				var orbit = new THREE.OrbitControls(camera);

				// 创建一个渲染器并设置大小，WebGLRenderer将会使用电脑显卡来渲染场景
				renderer = new THREE.WebGLRenderer({
					antialias: true,
					logarithmicDepthBuffer: true,
				});
				renderer.setClearColor(new THREE.Color("#0e0934"));
				renderer.setSize(window.innerWidth, window.innerHeight);
				// 基础光源，并应用到场景
				scene.add(new THREE.AmbientLight("#ffffff", 1.5));

				initModel();

				// 将呈现器的输出添加到HTML元素
				document.getElementById("dom").appendChild(renderer.domElement);

				// 启动动画
				renderScene();

				// 添加模型
				function initModel() {
					var mtlLoader = new THREE.MTLLoader();
					mtlLoader.setPath("assets/models/factory_new/")
					mtlLoader.load('factory.mtl', function(materials) {
						materials.preload();

						var objLoader = new THREE.OBJLoader();
						objLoader.setMaterials(materials);
						objLoader.load('assets/models/factory_new/factory.obj', function(object) {
							mesh = object;
							mesh.scale.set(0.0003, 0.0003, 0.0003);
							mesh.position.set(-200, 0.5, -200);
							scene.add(mesh);
						});
					});
				}

				document.addEventListener('click', onDocumentMouseDown, false); //监听单击拾取对象初始化球体

				function onDocumentMouseDown(event) {
					// 点击屏幕创建一个向量
					var vector = new THREE.Vector3((event.clientX / window.innerWidth) * 2 - 1, -(event.clientY / window
						.innerHeight) * 2 + 1, 0.5);
					vector = vector.unproject(camera); // 将屏幕的坐标转换成三维场景中的坐标
					var raycaster = new THREE.Raycaster(camera.position, vector.sub(camera.position).normalize());
					var intersects = raycaster.intersectObjects(mesh.children, true);
					console.log(intersects)
					if (intersects.length > 0) {
						// intersects[0].object.material.color.set("#006100");
					}
				}

				function renderScene() {
					orbit.update();
					// 使用requestAnimationFrame函数进行渲染
					requestAnimationFrame(renderScene);
					renderer.render(scene, camera);
				}

				// 渲染的场景
				renderer.render(scene, camera);
			}
			window.onload = init;

			// 随着窗体的变化修改场景
			function onResize() {
				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();
				renderer.setSize(window.innerWidth, window.innerHeight);
			}
			// 监听窗体调整大小事件
			window.addEventListener('resize', onResize, false);
		</script>
	</body>
</html>