安徽网站设计流程,怎么在百度上建立网站,徐州市政建设集团公司网站,企业管理培训课程有哪些我们在项目中会有一些这样的需求#xff0c;我们可视化一个场景#xff0c;需要俯视、平移、缩放#xff0c;方便观察场景中的数据或者模型#xff0c;之所以把这个案例拿出来 1、这是个很实用的需求#xff0c;我相信很多人会用到 2、我自己认为在实际案例中我们可以学习…我们在项目中会有一些这样的需求我们可视化一个场景需要俯视、平移、缩放方便观察场景中的数据或者模型之所以把这个案例拿出来 1、这是个很实用的需求我相信很多人会用到 2、我自己认为在实际案例中我们可以学习相关知识点更易吸收些 为了丰富本篇文章知识点我还加入了一个物体沿轨迹运动的场景下面代码会介绍到回到之前的问题three中可以利用对 OrbitControls 的设置很轻松的实现相关场景代码如下
controls new OrbitControls( camera, renderer.domElement );// 移动端控制平移 缩放// controls.touches {// ONE: THREE.TOUCH.PAN,// TWO: THREE.TOUCH.DOLLY_PAN// };// PC 左平移右旋转 滚轮放大缩小 默认是右平移controls.mouseButtons {LEFT: THREE.MOUSE.PAN,MIDDLE: THREE.MOUSE.DOLLY,RIGHT: THREE.MOUSE.ROTATE};// 设置最大最小视距controls.minDistance 20;controls.maxDistance 1000;controls.autoRotate false;controls.enableRotate false;controls.enablePan true;需要注意的是移动端和PC是不同的配置minDistance和maxDistance按实际需求设置即可到这一步只是对controls的操作已经有能力实现效果了但是camera的设置也是不可或缺的即camera必须是俯视的 先上下整体效果图 看下代码
!DOCTYPE html
html langen
headmeta charsetUTF-8titleTitle/titlestylebody {width: 100%;height: 100%;}* {margin: 0;padding: 0;}.label {font-size: 20px;color: #000;font-weight: 700;}/style
/head
body
div idcontainer/div
script typeimportmap{imports: {three: ../three-155/build/three.module.js,three/addons/: ../three-155/examples/jsm/}}
/script
script typemodule
import * as THREE from three;
import Stats from three/addons/libs/stats.module.js;
import { OrbitControls } from three/addons/controls/OrbitControls.js;
import { CSS2DRenderer, CSS2DObject } from three/addons/renderers/CSS2DRenderer.js;
let stats, labelRenderer, curve, movingObjects;
let camera, scene, renderer, mesBox, target, controls;
const group new THREE.Group();
let progress 0; // 物体运动时在运动路径的初始位置范围0~1
const velocity 0.0005; // 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
let widthImg 200;
let heightImg 200;
init();
initHelp();
initLight();
axesHelperWord();
animate();
// 添加一个物体
mesBox addGeometries();
// 添加平面
addPlane();
// 添加路径
makeCurve();
// 添加一个运动的物体
movingObjects addMovingObjects();window.addEventListener(mousemove, mousemoveFun);function addPlane() {// 创建一个平面 PlaneGeometry(width, height, widthSegments, heightSegments)const planeGeometry new THREE.PlaneGeometry(widthImg, heightImg, 1, 1);// 创建 Lambert 材质会对场景中的光源作出反应但表现为暗淡而不光亮。const planeMaterial new THREE.MeshLambertMaterial({color: 0xffffff});const plane new THREE.Mesh(planeGeometry, planeMaterial);// 以自身中心为旋转轴绕 x 轴顺时针旋转 45 度plane.rotation.x -0.5 * Math.PI;plane.position.set(0, -4, 0);scene.add(plane);
}function addGeometries() {let img new THREE.TextureLoader().load(../materials/img/view4.jpg);img.repeat.x img.repeat.y 5;const geometry new THREE.BoxGeometry( 10, 10, 10 );let material new THREE.MeshPhongMaterial({map: img,flatShading: true,side: THREE.DoubleSide,transparent: 1});const mesh new THREE.Mesh( geometry, material );mesh.position.x 0;mesh.position.y 0;mesh.position.z -20;scene.add( mesh );return mesh;
}function addMovingObjects() {let img new THREE.TextureLoader().load(../materials/img/view3.jpg);const geometry new THREE.BoxGeometry( 10, 10, 10 );const material new THREE.MeshPhongMaterial({map: img,flatShading: true,side: THREE.DoubleSide,transparent: 1});const mesh new THREE.Mesh( geometry, material );scene.add( mesh );return mesh;
}function makeCurve() {// 创建一个环形路径curve new THREE.CatmullRomCurve3([new THREE.Vector3(80, 0, 80),new THREE.Vector3(80, 0, -80),new THREE.Vector3(-80, 0, -80),new THREE.Vector3(-80, 0, 80)]);curve.curveType catmullrom;curve.closed true;//设置是否闭环curve.tension 0; //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(20);const geometry new THREE.BufferGeometry().setFromPoints(points);const material new THREE.LineBasicMaterial({color: #f00,linewidth: 1});// Create the final object to add to the sceneconst curveObject new THREE.Line(geometry, material);curveObject.position.y 1;curveObject.visible false;scene.add(curveObject);
}function mousemoveFun() {let width widthImg;let height heightImg;let newPo;let newPoHeight;const prevPos camera.position.clone();if (camera.position[x] width / 2) {newPo width / 2 - 0.01;camera.position.set(newPo, prevPos.y, prevPos.z);controls.target new THREE.Vector3(newPo, 0, prevPos.z);controls.enablePan false;} else if (camera.position[x] -width / 2) {newPo -width / 2 0.01;camera.position.set(newPo, prevPos.y, prevPos.z);controls.target new THREE.Vector3(newPo, 0, prevPos.z);controls.enablePan false;} else if (camera.position[z] height / 2) {// 因为我们的坐标系 y轴在上 所以平移时 height 即是 znewPoHeight height / 2 - 0.01;camera.position.set(prevPos.x, prevPos.y, newPoHeight);controls.target new THREE.Vector3(prevPos.x, 0, newPoHeight);controls.enablePan false;} else if (camera.position[z] -height / 2) {newPoHeight -height / 2 0.01;camera.position.set(prevPos.x, prevPos.y, newPoHeight);controls.target new THREE.Vector3(prevPos.x, 0, newPoHeight);controls.enablePan false;} else {controls.enablePan true;}
}function init() {camera new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 10, 2000 );camera.up.set(0, 1, 0);camera.position.set(0, 100, 0);camera.lookAt(0, 0, 0);scene new THREE.Scene();// scene.background new THREE.Color( #ccc );renderer new THREE.WebGLRenderer( { antialias: true } );renderer.setPixelRatio( window.devicePixelRatio );renderer.setSize( window.innerWidth, window.innerHeight );document.body.appendChild( renderer.domElement );labelRenderer new CSS2DRenderer();labelRenderer.setSize( window.innerWidth, window.innerHeight );labelRenderer.domElement.style.position absolute;labelRenderer.domElement.style.top 0px;labelRenderer.domElement.style.pointerEvents none;document.getElementById( container ).appendChild( labelRenderer.domElement );controls new OrbitControls( camera, renderer.domElement );// 移动端控制平移 缩放// controls.touches {// ONE: THREE.TOUCH.PAN,// TWO: THREE.TOUCH.DOLLY_PAN// };// PC 左平移右旋转 滚轮放大缩小 默认是右平移controls.mouseButtons {LEFT: THREE.MOUSE.PAN,MIDDLE: THREE.MOUSE.DOLLY,RIGHT: THREE.MOUSE.ROTATE};// 设置最大最小视距controls.minDistance 20;controls.maxDistance 1000;controls.autoRotate false;controls.enableRotate false;controls.enablePan true;window.addEventListener( resize, onWindowResize );stats new Stats();stats.setMode(1); // 0: fps, 1: msdocument.body.appendChild( stats.dom );scene.add( group );
}function initLight() {let spotLight;spotLight new THREE.SpotLight( 0xffffff, 500 );spotLight.name Spot Light;spotLight.angle Math.PI / 5;spotLight.penumbra 0.1;spotLight.position.set( 0, 5, 10 );spotLight.castShadow true;spotLight.shadow.camera.near 2;spotLight.shadow.camera.far 100;spotLight.shadow.mapSize.width 1024;spotLight.shadow.mapSize.height 1024;scene.add( spotLight );const AmbientLight new THREE.AmbientLight(0xCCCCCC, 2);scene.add( AmbientLight );
}function initHelp() {// const size 100;// const divisions 5;// const gridHelper new THREE.GridHelper( size, divisions );// scene.add( gridHelper );// The X axis is red. The Y axis is green. The Z axis is blue.const axesHelper new THREE.AxesHelper( 100 );scene.add( axesHelper );
}function axesHelperWord() {let xP addWord(X轴);let yP addWord(Y轴);let zP addWord(Z轴);xP.position.set(50, 0, 0);yP.position.set(0, 50, 0);zP.position.set(0, 0, 50);
}function addWord(word) {let name span${word}/span;let moonDiv document.createElement( div );moonDiv.className label;// moonDiv.textContent Moon;// moonDiv.style.marginTop -1em;moonDiv.innerHTML name;const label new CSS2DObject( moonDiv );group.add( label );return label;
}function onWindowResize() {camera.aspect window.innerWidth / window.innerHeight;camera.updateProjectionMatrix();renderer.setSize( window.innerWidth, window.innerHeight );
}function animate() {requestAnimationFrame( animate );// mesh绕自身中心的 y 轴自转if (mesBox) {mesBox.rotation.y 0.01;}if (curve movingObjects) {if (progress 1 - velocity) {// 获取样条曲线指定点坐标const point curve.getPointAt(progress);movingObjects.position.set(point.x, point.y, point.z);progress velocity;} else {progress 0;}}stats.update();controls.update();labelRenderer.render( scene, camera );renderer.render( scene, camera );
}
/script
/body
/html
这里是全部代码可以看出 three用的是 155版本大家从官网上下载到本地改下路径即可。图片url你可以换成本地图片项目就能跑起来了。
中间立方体在做了一个环绕自身y轴旋转外面的立方体通过获取curve上的坐标点沿着curve的轨迹运动。
这里有一些新的知识点 new THREE.TextureLoader().load(‘…/materials/img/view3.jpg’); TextureLoader是three加载图片的方法我们还可以这样用 let loader new THREE.TextureLoader(); loader.load(‘url’, (img) { // img 这个img就是加载完成后的图片 }); 这时就一个疑问了同步还是异步我们来看源码 其实还是异步拿到图片后我们发现material有一个map参数可以接收图片作为材质这样material就可以做的很丰富了side是指物体的正反两面THREE.DoubleSide即两面都要渲染如果我们只看外面不要设置这里这样也能节省一些性能 let material new THREE.MeshPhongMaterial({map: img,flatShading: true,side: THREE.DoubleSide,transparent: 1});最后一个知识点即物体沿着轨迹运动我们把这一行代码 curveObject.visible false; 改为 true 大家就可以看到这个轨迹了。 逻辑代码中已经写的很详细了大家也可以思考下还有哪些方法可以作为curve使用。 如果感觉有用点个赞不过分吧
