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网站制作思路,张家港seo建站,民治做网站的公司,央视网商城目录流程搭建场景环境添加模型增加运动轨迹让模型沿轨迹运动完整代码和效果流程基本流程 1、添加模型 2、增加运动轨迹 3、让模型沿轨迹运动工程文件结构如下图： static：存放静态资源文件 three.js-master：为官网下载的代码包，…

流程

基本流程

1、添加模型
2、增加运动轨迹
3、让模型沿轨迹运动

工程文件结构如下图：
static：存放静态资源文件
three.js-master：为官网下载的代码包，包含所有需要用到的资源包，链接：https://github.com/mrdoob/three.js/archive/master.zip
index.html：页面代码
在这里插入图片描述
模型使用的是官方示例中的Soldier模型，文件位置：three.js-master\examples\models\gltf\Soldier.glb
为了方便操作我们将文件拷出来放在上图static\3dmod\gltf文件夹下，static与three.js-master同级

index.html单页代码组成

<!DOCTYPE html>
<html><head><meta charset="utf-8"><title>My first three.js app</title><style>body {margin: 0;}</style>
</head><body><script type="importmap">{"imports": {"three": "./three.js-master/build/three.module.js"}}</script><script type="module">// 下文JS代码位置// ...</script>
</body></html>

参照官网例子：https://threejs.org/examples/#webgl_animation_skinning_blending中的场景和模型

搭建场景环境

import * as THREE from "three";
import { OrbitControls } from "./three.js-master/examples/jsm/controls/OrbitControls.js";let scene, camera, renderer;// 渲染器开启阴影渲染：renderer.shadowMapEnabled = true;
// 灯光需要开启“引起阴影”：light.castShadow = true;
// 物体需要开启“引起阴影”和“接收阴影”：mesh.castShadow = mesh.receiveShadow = true;function init() {scene = new THREE.Scene();camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);renderer = new THREE.WebGLRenderer();// position and point the camera to the center of the scenecamera.position.set(5, 5, 5);camera.lookAt(scene.position);// 增加坐标系红色代表 X 轴. 绿色代表 Y 轴. 蓝色代表 Z 轴.// 添加坐标系到场景中const axes = new THREE.AxesHelper(20);scene.add(axes);// 调整背景颜色，边界雾化scene.background = new THREE.Color(0xa0a0a0);scene.fog = new THREE.Fog(0xa0a0a0, 10, 30);// 半球形光源const hemiLight = new THREE.HemisphereLight(0xffffff, 0x444444);hemiLight.position.set(0, 10, 0);scene.add(hemiLight);// 创建一个虚拟的球形网格 Mesh 的辅助对象来模拟 半球形光源 HemisphereLight.const hemiLighthelper = new THREE.HemisphereLightHelper(hemiLight, 5);scene.add(hemiLighthelper);// 地面const mesh = new THREE.Mesh(new THREE.PlaneGeometry(100, 100), new THREE.MeshPhongMaterial({ color: 0x999999, depthWrite: false }));mesh.rotation.x = - Math.PI / 2;mesh.receiveShadow = true;scene.add(mesh);// 平行光const directionalLight = new THREE.DirectionalLight(0xFFFFFF);directionalLight.castShadow = true;directionalLight.shadow.camera.near = 0.5;directionalLight.shadow.camera.far = 50;directionalLight.shadow.camera.left = -10;directionalLight.shadow.camera.right = 10;directionalLight.shadow.camera.top = 10;directionalLight.shadow.camera.bottom = -10;directionalLight.position.set(0, 5, 5);scene.add(directionalLight);// 用于模拟场景中平行光 DirectionalLight 的辅助对象. 其中包含了表示光位置的平面和表示光方向的线段.const directionalLightHelper = new THREE.DirectionalLightHelper(directionalLight, 5);scene.add(directionalLightHelper);renderer.shadowMap.enabled = true;renderer.setSize(window.innerWidth, window.innerHeight);document.body.appendChild(renderer.domElement);// 控制器const controls = new OrbitControls(camera, renderer.domElement);
}
// 渲染
function animate() {requestAnimationFrame(animate);renderer.render(scene, camera);
};

这里是添加了几个辅助对象，方便找到光照和场景坐标位置
在这里插入图片描述

添加模型

这里我们直接导入模型，在《Three.js学习四——模型导入》中有相对详细的介绍

let model = null;
function loadModel() {// 加载模型并开启阴影和接受阴影const gltfLoader = new GLTFLoader();gltfLoader.setPath('./static/3dmod/gltf/').load('Soldier.glb', function (gltf) {// gltf.scene.rotation.y = Math.PI;// console.log("gltf", gltf)gltf.scene.scale.set(1, 1, 1)gltf.scene.traverse(function (object) {if (object.isMesh) {object.castShadow = true; //阴影object.receiveShadow = true; //接受别人投的阴影}});scene.add(gltf.scene);model = gltf.scene;}, function (res) {// console.log(res.total, res.loaded)});
}

增加运动轨迹

用到了Three.js提供的CatmullRomCurve3：使用Catmull-Rom算法，从一系列的点创建一条平滑的三维样条曲线。

let curve = null;
function makeCurve() {//Create a closed wavey loopcurve = new THREE.CatmullRomCurve3([new THREE.Vector3(0, 0, 0),new THREE.Vector3(5, 0, 0),new THREE.Vector3(0, 0, 5)]);curve.curveType = "catmullrom";curve.closed = true;//设置是否闭环curve.tension = 0.5![请添加图片描述](https://img-blog.csdnimg.cn/12a2fa45062d44a58bb7cbf719e4b20f.gif)
; //设置线的张力，0为无弧度折线// 为曲线添加材质在场景中显示出来，不显示也不会影响运动轨迹，相当于一个Helperconst points = curve.getPoints(50);const geometry = new THREE.BufferGeometry().setFromPoints(points);const material = new THREE.LineBasicMaterial({ color: 0x000000 });// Create the final object to add to the sceneconst curveObject = new THREE.Line(geometry, material);scene.add(curveObject)
}

让模型沿轨迹运动

let progress = 0; // 物体运动时在运动路径的初始位置，范围0~1
const velocity = 0.001; // 影响运动速率的一个值，范围0~1，需要和渲染频率结合计算才能得到真正的速率
// 物体沿线移动方法
function moveOnCurve() {if (curve == null || model == null) {console.log("Loading")} else {if (progress <= 1 - velocity) {const point = curve.getPointAt(progress); //获取样条曲线指定点坐标const pointBox = curve.getPointAt(progress + velocity); //获取样条曲线指定点坐标if (point && pointBox) {model.position.set(point.x, point.y, point.z);// model.lookAt(pointBox.x, pointBox.y, pointBox.z); //因为这个模型加载进来默认面部是正对Z轴负方向的，所以直接lookAt会导致出现倒着跑的现象，这里用重新设置朝向的方法来解决。var targetPos = pointBox   //目标位置点var offsetAngle = 0 //目标移动时的朝向偏移// //以下代码在多段路径时可重复执行var mtx = new THREE.Matrix4()  //创建一个4维矩阵// .lookAt ( eye : Vector3, target : Vector3, up : Vector3 ) : this,构造一个旋转矩阵，从eye 指向 target，由向量 up 定向。mtx.lookAt(model.position, targetPos, model.up) //设置朝向mtx.multiply(new THREE.Matrix4().makeRotationFromEuler(new THREE.Euler(0, offsetAngle, 0)))var toRot = new THREE.Quaternion().setFromRotationMatrix(mtx)  //计算出需要进行旋转的四元数值model.quaternion.slerp(toRot, 0.2)}progress += velocity;} else {progress = 0;}}};
// moveOnCurve()需要在渲染中一直调用更新，以达到物体移动效果
function animate() {requestAnimationFrame(animate);moveOnCurve();renderer.render(scene, camera);
};

完整代码和效果

完整代码

<!DOCTYPE html>
<html><head><meta charset="utf-8"><title>My first three.js app</title><style>body {margin: 0;}</style>
</head><body><script type="importmap">{"imports": {"three": "./three.js-master/build/three.module.js"}}</script><script type="module">import * as THREE from "three";import { OrbitControls } from "./three.js-master/examples/jsm/controls/OrbitControls.js";import { GLTFLoader } from "./three.js-master/examples/jsm/loaders/GLTFLoader.js";let scene, camera, renderer;let curve = null, model = null;let progress = 0; // 物体运动时在运动路径的初始位置，范围0~1const velocity = 0.001; // 影响运动速率的一个值，范围0~1，需要和渲染频率结合计算才能得到真正的速率// 渲染器开启阴影渲染：renderer.shadowMapEnabled = true;// 灯光需要开启“引起阴影”：light.castShadow = true;// 物体需要开启“引起阴影”和“接收阴影”：mesh.castShadow = mesh.receiveShadow = true;function init() {scene = new THREE.Scene();camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);renderer = new THREE.WebGLRenderer();// position and point the camera to the center of the scenecamera.position.set(5, 5, 5);camera.lookAt(scene.position);// 增加坐标系红色代表 X 轴. 绿色代表 Y 轴. 蓝色代表 Z 轴.// 添加坐标系到场景中const axes = new THREE.AxesHelper(20);scene.add(axes);// 调整背景颜色，边界雾化scene.background = new THREE.Color(0xa0a0a0);scene.fog = new THREE.Fog(0xa0a0a0, 10, 30);// 半球形光源const hemiLight = new THREE.HemisphereLight(0xffffff, 0x444444);hemiLight.position.set(0, 10, 0);scene.add(hemiLight);// 创建一个虚拟的球形网格 Mesh 的辅助对象来模拟 半球形光源 HemisphereLight.const hemiLighthelper = new THREE.HemisphereLightHelper(hemiLight, 5);scene.add(hemiLighthelper);// 地面const mesh = new THREE.Mesh(new THREE.PlaneGeometry(100, 100), new THREE.MeshPhongMaterial({ color: 0x999999, depthWrite: false }));mesh.rotation.x = - Math.PI / 2;mesh.receiveShadow = true;scene.add(mesh);// 平行光const directionalLight = new THREE.DirectionalLight(0xFFFFFF);directionalLight.castShadow = true;directionalLight.shadow.camera.near = 0.5;directionalLight.shadow.camera.far = 50;directionalLight.shadow.camera.left = -10;directionalLight.shadow.camera.right = 10;directionalLight.shadow.camera.top = 10;directionalLight.shadow.camera.bottom = -10;directionalLight.position.set(0, 5, 5);scene.add(directionalLight);// 用于模拟场景中平行光 DirectionalLight 的辅助对象. 其中包含了表示光位置的平面和表示光方向的线段.const directionalLightHelper = new THREE.DirectionalLightHelper(directionalLight, 5);scene.add(directionalLightHelper);renderer.shadowMap.enabled = true;renderer.setSize(window.innerWidth, window.innerHeight);document.body.appendChild(renderer.domElement);// 控制器const controls = new OrbitControls(camera, renderer.domElement);}function loadModel() {// 加载模型并开启阴影和接受阴影const gltfLoader = new GLTFLoader();gltfLoader.setPath('./static/3dmod/gltf/').load('Soldier.glb', function (gltf) {// gltf.scene.rotation.y = Math.PI;// console.log("gltf", gltf)gltf.scene.scale.set(1, 1, 1)gltf.scene.traverse(function (object) {if (object.isMesh) {object.castShadow = true; //阴影object.receiveShadow = true; //接受别人投的阴影}});scene.add(gltf.scene);model = gltf.scene;}, function (res) {// console.log(res.total, res.loaded)});}function makeCurve() {//Create a closed wavey loopcurve = new THREE.CatmullRomCurve3([new THREE.Vector3(0, 0, 0),new THREE.Vector3(5, 0, 0),new THREE.Vector3(0, 0, 5)]);curve.curveType = "catmullrom";curve.closed = true;//设置是否闭环curve.tension = 0.5; //设置线的张力，0为无弧度折线// 为曲线添加材质在场景中显示出来，不显示也不会影响运动轨迹，相当于一个Helperconst points = curve.getPoints(50);const geometry = new THREE.BufferGeometry().setFromPoints(points);const material = new THREE.LineBasicMaterial({ color: 0x000000 });// Create the final object to add to the sceneconst curveObject = new THREE.Line(geometry, material);scene.add(curveObject)}// 物体沿线移动方法function moveOnCurve() {if (curve == null || model == null) {console.log("Loading")} else {if (progress <= 1 - velocity) {const point = curve.getPointAt(progress); //获取样条曲线指定点坐标const pointBox = curve.getPointAt(progress + velocity); //获取样条曲线指定点坐标if (point && pointBox) {model.position.set(point.x, point.y, point.z);// model.lookAt(pointBox.x, pointBox.y, pointBox.z);//因为这个模型加载进来默认面部是正对Z轴负方向的，所以直接lookAt会导致出现倒着跑的现象，这里用重新设置朝向的方法来解决。var targetPos = pointBox   //目标位置点var offsetAngle = 0 //目标移动时的朝向偏移// //以下代码在多段路径时可重复执行var mtx = new THREE.Matrix4()  //创建一个4维矩阵// .lookAt ( eye : Vector3, target : Vector3, up : Vector3 ) : this,构造一个旋转矩阵，从eye 指向 target，由向量 up 定向。mtx.lookAt(model.position, targetPos, model.up) //设置朝向mtx.multiply(new THREE.Matrix4().makeRotationFromEuler(new THREE.Euler(0, offsetAngle, 0)))var toRot = new THREE.Quaternion().setFromRotationMatrix(mtx)  //计算出需要进行旋转的四元数值model.quaternion.slerp(toRot, 0.2)}progress += velocity;} else {progress = 0;}}};function animate() {requestAnimationFrame(animate);moveOnCurve();renderer.render(scene, camera);};init();loadModel();makeCurve();animate();</script>
</body></html>