利用Three.js实现3D三棱锥立体特效
目录
- 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] ];
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