利用Three.js实现3D三棱锥立体特效

Octavia ·

更新时间:2024-09-21

· 1517 次阅读

演示

技术栈

源码

css部分

js部分

演示

技术栈

3D特效的话最容易让人想到的应该是three.js吧。我们今天来说说它。

Three.js是基于原生WebGL封装运行的三维引擎，在所有WebGL引擎中，Three.js是国内文资料最多、使用最广泛的三维引擎。

Threejs是一款WebGL三维引擎，它可以用来做什么许多许多地场景应用

一个小案例

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>第一个three.js文件_WebGL三维场景</title>
  <style>
    body {
      margin: 0;
      overflow: hidden;
      /* 隐藏body窗口区域滚动条 */
    }
  </style>
  <!--引入three.js三维引擎-->
  <!-- <script src="http://www.yanhuangxueyuan.com/versions/threejsR92/build/three.js"></script>-->
  <script src="js/three/build/three.js"></script>
  <!-- <script src="http://www.yanhuangxueyuan.com/threejs/build/three.js"></script> -->
</head>
<body>
  <script>
    /**
     * 创建场景对象Scene
     */
    var scene = new THREE.Scene();
    /**
     * 创建网格模型
     */
    // var geometry = new THREE.SphereGeometry(60, 40, 40); //创建一个球体几何对象
    var geometry = new THREE.BoxGeometry(100, 100, 100); //创建一个立方体几何对象Geometry
    var material = new THREE.MeshLambertMaterial({
      color: 0x0000ff
    }); //材质对象Material
    var mesh = new THREE.Mesh(geometry, material); //网格模型对象Mesh
    scene.add(mesh); //网格模型添加到场景中
    /**
     * 光源设置
     */
    //点光源
    var point = new THREE.PointLight(0xffffff);
    point.position.set(400, 200, 300); //点光源位置
    scene.add(point); //点光源添加到场景中
    //环境光
    var ambient = new THREE.AmbientLight(0x444444);
    scene.add(ambient);
    // console.log(scene)
    // console.log(scene.children)
    /**
     * 相机设置
     */
    var width = window.innerWidth; //窗口宽度
    var height = window.innerHeight; //窗口高度
    var k = width / height; //窗口宽高比
    var s = 200; //三维场景显示范围控制系数，系数越大，显示的范围越大
    //创建相机对象
    var camera = new THREE.OrthographicCamera(-s * k, s * k, s, -s, 1, 1000);
    camera.position.set(200, 300, 200); //设置相机位置
    camera.lookAt(scene.position); //设置相机方向(指向的场景对象)
    /**
     * 创建渲染器对象
     */
    var renderer = new THREE.WebGLRenderer();
    renderer.setSize(width, height);//设置渲染区域尺寸
    renderer.setClearColor(0xb9d3ff, 1); //设置背景颜色
    document.body.appendChild(renderer.domElement); //body元素中插入canvas对象
    //执行渲染操作   指定场景、相机作为参数
    renderer.render(scene, camera);
  </script>
</body>
</html>

源码 css部分

body{
  overflow: hidden;
  margin:0;
}
canvas{
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height:100%;
}

js部分

var w = window.innerWidth, h = window.innerHeight;
window.onresize = function(){
  var w = window.innerWidth, h = window.innerHeight;
  camera.aspect = w / h;
  camera.updateProjectionMatrix();
  renderer.setSize( w, h );
}
cameraSpeed = .0003;
lightSpeed = .001;
tubularSegments = 1000;
radialSegments = 3;
tubeRadius = 2;
lightColor = 0xffffff;
lightIntensity = 1;
lightDistance = 20;
var renderer = new THREE.WebGLRenderer({
  canvas: document.querySelector("canvas"),
  antialias: true,
});
renderer.setSize(w, h);
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(60, w / h, .001, 1000);
var starsGeometry = new THREE.Geometry();
for(i=0; i<3000; i++){
var star = new THREE.Vector3();
star.x = THREE.Math.randFloatSpread(1500);
star.y = THREE.Math.randFloatSpread(1500);
star.z = THREE.Math.randFloatSpread(1500);
starsGeometry.vertices.push(star);
}
var starsMaterial = new THREE.PointsMaterial({color: 0xffffff});
var starField = new THREE.Points(starsGeometry,starsMaterial);
scene.add(starField);
for (i=0; i<p.length; i++) {
  var x = p[i][0];
  var y = p[i][2];
  var z = p[i][1];
  p[i] = new THREE.Vector3(x,y,z);
}
var path = new THREE.CatmullRomCurve3(p);
var geometry = new THREE.TubeGeometry(path,tubularSegments,tubeRadius,radialSegments,true);
for(i=0; i<geometry.faces.length; i++){
  geometry.faces[i].color = new THREE.Color("hsl("+i/2+",100%,50%)");
}
var material = new THREE.MeshLambertMaterial({
  side: THREE.BackSide,
  vertexColors: THREE.FaceColors,
  wireframe: true
});
var tube = new THREE.Mesh(geometry, material);
scene.add(tube);
var light = new THREE.PointLight(0xffffff, 1, 50);
scene.add(light);
var light2 = new THREE.AmbientLight(0x222222);
scene.add(light2);
var l1 = new THREE.PointLight(lightColor, lightIntensity, lightDistance);
scene.add(l1);
var l2 = new THREE.PointLight(lightColor, lightIntensity, lightDistance);
scene.add(l2);
var l3 = new THREE.PointLight(lightColor, lightIntensity, lightDistance);
scene.add(l3);
var l4 = new THREE.PointLight(lightColor, lightIntensity, lightDistance);
scene.add(l4);
var l5 = new THREE.PointLight(lightColor, lightIntensity, lightDistance);
scene.add(l5);
var pct = 0;
var pct2 = 0;
function render(){
  pct += cameraSpeed
  pct2 += lightSpeed;
  var pt1 = path.getPointAt(pct%1);
  var pt2 = path.getPointAt((pct + .01)%1);
  camera.position.set(pt1.x,pt1.y,pt1.z);
  camera.lookAt(pt2);
  light.position.set(pt2.x, pt2.y, pt2.z);
  l1.position.set(path.getPointAt((pct2+.0)%1).x, path.getPointAt((pct2+.0)%1).y, path.getPointAt((pct2+.0)%1).z);
  l2.position.set(path.getPointAt((pct2+.2)%1).x, path.getPointAt((pct2+.2)%1).y, path.getPointAt((pct2+.2)%1).z);
  l3.position.set(path.getPointAt((pct2+.4)%1).x, path.getPointAt((pct2+.4)%1).y, path.getPointAt((pct2+.4)%1).z);
  l4.position.set(path.getPointAt((pct2+.6)%1).x, path.getPointAt((pct2+.6)%1).y, path.getPointAt((pct2+.6)%1).z);
  l5.position.set(path.getPointAt((pct2+.8)%1).x, path.getPointAt((pct2+.8)%1).y, path.getPointAt((pct2+.8)%1).z);
  renderer.render(scene, camera);
  requestAnimationFrame(render);
}
requestAnimationFrame(render);

p = [
[389,246,0],
  [410,255,20],
  [413,268,7],
  [431,261,12],
  [418,244,30],
  [416,217,25],
  [420,205,8],
  [427,227,-20],
  [432,236,5],
  [444,228,12],
  [451,232,41],
  [446,246,72],
  [443,264,96],
  [446,278,65],
  [463,267,20],
  [460,258,-10],
  [464,243,-20],
  [459,233,0],
  [475,225,22],
  [484,225,29],
  [490,214,51],
  [476,202,55],
  [462,202,55],
  [446,205,42],
  [440,192,42],
  [430,183,72],
  [413,184,58],
  [406,191,32],
  [406,207,0],
  [402,220,0],
  [390,222,20],
  [385,228,10],
  [389,246,0]
];

以上就是利用Three.js实现3D三棱锥立体特效的详细内容，更多关于Three.js 3D三棱锥立体特效的资料请关注软件开发网其它相关文章！

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