73 Three.js 导入PLY格式的模型
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2022-03-31 12:28:31
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简介
PLY
格式的全称是多边形(Polygon
)文件格式,通常用来保存三维扫描仪的信息。这种格式只保存几何体数据,没有纹理颜色。
实现案例
案例查看地址:http://www.wjceo.com/blog/threejs/2018-03-22/133.html
- 首先,引入script加载器
<script src="/lib/js/loaders/PLYLoader.js"></script>
- 然后,实例化加载器对象,然后加载模型,
PLY
模型里面只保存了几何体,所以我们实例化了一个纹理,添加到场景当中。
var loader = new THREE.PLYLoader();
loader.load("/lib/models/ply/binary/Lucy100k.ply", function (geometry) {
//更新顶点的法向量
geometry.computeVertexNormals();
//创建纹理,并将模型添加到场景道中
var material = new THREE.MeshStandardMaterial( { color: 0x0055ff, flatShading: true } );
var mesh = new THREE.Mesh( geometry, material );
mesh.rotation.y = Math.PI;
mesh.scale.set(0.05, 0.05, 0.05);
scene.add( mesh );
});
案例代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
html, body {
margin: 0;
height: 100%;
}
canvas {
display: block;
}
</style>
</head>
<body onload="draw();">
</body>
<script src="/lib/three.js"></script>
<script src="/lib/js/loaders/PLYLoader.js"></script>
<script src="/lib/js/controls/OrbitControls.js"></script>
<script src="/lib/js/libs/stats.min.js"></script>
<script src="/lib/js/libs/dat.gui.min.js"></script>
<script>
var renderer;
function initRender() {
renderer = new THREE.WebGLRenderer({antialias:true});
renderer.setSize(window.innerWidth, window.innerHeight);
//告诉渲染器需要阴影效果
renderer.setClearColor(0xffffff);
document.body.appendChild(renderer.domElement);
}
var camera;
function initCamera() {
camera = new THREE.PerspectiveCamera(45, window.innerWidth/window.innerHeight, 0.1, 1000);
camera.position.set(0, 40, 50);
camera.lookAt(new THREE.Vector3(0,0,0));
}
var scene;
function initScene() {
scene = new THREE.Scene();
}
//初始化dat.GUI简化试验流程
var gui;
function initGui() {
//声明一个保存需求修改的相关数据的对象
gui = {
};
var datGui = new dat.GUI();
//将设置属性添加到gui当中,gui.add(对象,属性,最小值,最大值)
}
var light;
function initLight() {
scene.add(new THREE.AmbientLight(0x444444));
light = new THREE.PointLight(0xffffff);
light.position.set(0,50,50);
//告诉平行光需要开启阴影投射
light.castShadow = true;
scene.add(light);
}
function initModel() {
//辅助工具
var helper = new THREE.AxesHelper(50);
scene.add(helper);
var loader = new THREE.PLYLoader();
loader.load("/lib/models/ply/binary/Lucy100k.ply", function (geometry) {
//更新顶点的法向量
geometry.computeVertexNormals();
//创建纹理,并将模型添加到场景道中
var material = new THREE.MeshStandardMaterial( { color: 0x0055ff, flatShading: true } );
var mesh = new THREE.Mesh( geometry, material );
mesh.rotation.y = Math.PI;
mesh.scale.set(0.05, 0.05, 0.05);
scene.add( mesh );
});
}
//初始化性能插件
var stats;
function initStats() {
stats = new Stats();
document.body.appendChild(stats.dom);
}
//用户交互插件 鼠标左键按住旋转,右键按住平移,滚轮缩放
var controls;
function initControls() {
controls = new THREE.OrbitControls( camera, renderer.domElement );
// 如果使用animate方法时,将此函数删除
//controls.addEventListener( 'change', render );
// 使动画循环使用时阻尼或自转 意思是否有惯性
controls.enableDamping = true;
//动态阻尼系数 就是鼠标拖拽旋转灵敏度
//controls.dampingFactor = 0.25;
//是否可以缩放
controls.enableZoom = true;
//是否自动旋转
controls.autoRotate = true;
controls.autoRotateSpeed = 0.5;
//设置相机距离原点的最远距离
controls.minDistance = 1;
//设置相机距离原点的最远距离
controls.maxDistance = 200;
//是否开启右键拖拽
controls.enablePan = true;
}
function render() {
renderer.render( scene, camera );
}
//窗口变动触发的函数
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
render();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
//更新控制器
render();
//更新性能插件
stats.update();
controls.update();
requestAnimationFrame(animate);
}
function draw() {
initGui();
initRender();
initScene();
initCamera();
initLight();
initModel();
initControls();
initStats();
animate();
window.onresize = onWindowResize;
}
</script>
</html>