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three.js introductory example tutorial

小云云

Release： 2018-01-24 09:30:55

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This article mainly introduces the detailed explanation of three.js entry-level cases. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let’s follow the editor to take a look, I hope it can help everyone.

Recently, the company needed to use tree.js to display a 3D image, so I read the official documentation and recorded it when I had time.

Since our company's front-end framework uses angular, I encapsulated my treejs in a directive. The source code will be put later

First we need to know the download address of three.js. Its address is: https://github.com/mrdoob/three.js.

Secondly, what is three.js?

Several steps for three.js:

1: Introduce the three.js file (open the debugging window and enter the THREE.REVISION command under the Console to get the version No., successful)

2: Set a scene // var scene = new THREE. Scene();

3: var camera = new THREE. PerspectiveCamera( 75, window.innerWidth /window .innerHeight, 0.1, 1000); Set up a perspective camera
4: var renderer = new THREE. WebGLRenderer(); renderer. setSize(window.innerWidth, window.innerHeight); Set up a renderer

5: Add an object to the scene

modelUrl is the added file. For example: $scope. DView = cy3DView. newCanvas; $scope. DView. config( 'canvas')

$scope.process3DUrl = data.result.data.engineering_stl_mcube; $scope.DView.plan($scope.process3DUrl)
function plan(modelUrl) { 
 stlLoader = new THREE.STLLoader(); 
 group = new THREE.Object3D(); 
 stlLoader.load(modelUrl, function (geometry) { 
 //console.log(geometry); 
 var mat = new THREE.MeshLambertMaterial({color: 0x7777ff}); 
 group = new THREE.Mesh(geometry, mat); 
 group.rotation.x = -0.5 * Math.PI; 
 group.scale.set(0.6, 0.6, 0.6); 
 scene.add(group);  animation(); 
 }); }

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6: Rendering

renderer.render(scene, camera);

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ok Is it very simple? I personally think so. Friends who don’t understand can message me privately

The source code is as follows:

(function(window, document) {
  &#39;use strict&#39;;
  var three = window.THREE;
  var angular = window.angular;
  angular.module(&#39;cy-3D-view&#39;, []).factory(&#39;cy3DView&#39;, cy3DView);
  cy3DView.$inject = [&#39;$rootScope&#39;];
  function cy3DView($rootScope) {
    return {
      newCanvas: new Object(newCanvas($rootScope))
    };
  }
  function newCanvas() {
    var scene, camera, renderer, controls, group, ambient, fov, near, far, stlLoader;
    var width, height, keyLight, fillLight, backLight, spotLight, lighting;
    function config() {
      //设置3D图的宽和高   
      width = document.getElementById(&#39;canvas&#39;).clientWidth;
      height = document.getElementById(&#39;canvas&#39;).clientHeight;
      renderer = new THREE.WebGLRenderer({
        antialias: true
      });
      renderer.setSize(width, height);
      renderer.shadowMapEnabled = true;　
      document.getElementById(&#39;canvas&#39;).appendChild(renderer.domElement);
      renderer.setClearColor(0xFFFFFF, 1.0);
      scene = new THREE.Scene();
      lighting = false; //设置3D图的颜色   
      ambient = new THREE.AmbientLight(0xffffff, 1.0);
      scene.add(ambient);
      keyLight = new THREE.DirectionalLight(new THREE.Color(&#39;hsl(30, 100%, 75%)&#39;), 1.0);
      keyLight.position.set( - 100, 0, 100);
      fillLight = new THREE.DirectionalLight(new THREE.Color(&#39;hsl(240, 100%, 75%)&#39;), 0.75);
      fillLight.position.set(100, 0, 100);
      backLight = new THREE.DirectionalLight(0xffffff, 1.0);
      backLight.position.set(100, 0, -100).normalize();
      spotLight = new THREE.SpotLight(0xffffff);
      spotLight.position.set(150, 150, 150);
      scene.add(spotLight); //照相机配置   
      fov = 40;
      near = 1;
      far = 1000;
      camera = new THREE.PerspectiveCamera(fov, width / height, near, far);
      camera.position.x = 150;
      camera.position.y = 150;
      camera.position.z = 150;
      camera.lookAt({
        x: 0,
        y: 0,
        z: 0
      });
      camera.lookAt(new THREE.Vector3(0, 40, 0));
      controls = new THREE.OrbitControls(camera, renderer.domElement);
      controls.enableDamping = true;
      controls.dampingFactor = 0.25;
      controls.enableZoom = false;
      window.addEventListener(&#39;resize&#39;, onWindowResize, false);
      window.addEventListener(&#39;keydown&#39;, onKeyboardEvent, false);
      window.addEventListener(&#39;mousewheel&#39;, mousewheel, false);
    }
    function mousewheel(e) {
      e.preventDefault();
      if (e.wheelDelta) { //判断浏览器IE，谷歌滑轮事件   
        if (e.wheelDelta > 0) { //当滑轮向上滚动时    
          fov -= (near < fov ? 1 : 0);
        }
        if (e.wheelDelta < 0) {
          //当滑轮向下滚动时   
          fov += (fov < far ? 1 : 0);
        }
      } else if (e.detail) {
        //Firefox滑轮事件   
        if (e.detail > 0) {
          //当滑轮向上滚动时   
          fov -= 1;
        }
        if (e.detail < 0) {
          //当滑轮向下滚动时    
          fov += 1;
        }
      }
      camera.fov = fov;
      camera.updateProjectionMatrix();
      renderer.render(scene, camera);
    }
    function onWindowResize() {
      camera.aspect = width / height;
      camera.updateProjectionMatrix();
      renderer.setSize(width, height);
    }
    function onKeyboardEvent(e) {
      if (e.code === &#39;KeyL&#39;) {
        lighting = !lighting;
        if (lighting) {
          ambient.intensity = 0.25;
          scene.add(keyLight);
          scene.add(fillLight);
          scene.add(backLight);
        } else {
          ambient.intensity = 1.0;
          scene.remove(keyLight);
          scene.remove(fillLight);
          scene.remove(backLight);
        }
      }
    }
    function plan(modelUrl) {
      stlLoader = new THREE.STLLoader();
      group = new THREE.Object3D();
      stlLoader.load(modelUrl,
      function(geometry) {
        //console.log(geometry);   
        var mat = new THREE.MeshLambertMaterial({
          color: 0x7777ff
        });
        group = new THREE.Mesh(geometry, mat);
        group.rotation.x = -0.5 * Math.PI;
        group.scale.set(0.6, 0.6, 0.6);
        scene.add(group);
        animation();
      });
    }
    function animation() {
      renderer.render(scene, camera);
      requestAnimationFrame(animation);
    }
    return {
      config: config,
      plan: plan,
    };
  }
})(window, document);

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Related recommendations:

Three.js basic introductory learning tutorial

Three.js Detailed explanation of creating scene instances

Detailed explanation of how to run three.js locally

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