three.js introductory example tutorial

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(); 
 }); }

6: Rendering

renderer.render(scene, camera);

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) {
  'use strict';
  var three = window.THREE;
  var angular = window.angular;
  angular.module('cy-3D-view', []).factory('cy3DView', cy3DView);
  cy3DView.$inject = ['$rootScope'];
  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('canvas').clientWidth;
      height = document.getElementById('canvas').clientHeight;
      renderer = new THREE.WebGLRenderer({
        antialias: true
      });
      renderer.setSize(width, height);
      renderer.shadowMapEnabled = true;　
      document.getElementById('canvas').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('hsl(30, 100%, 75%)'), 1.0);
      keyLight.position.set( - 100, 0, 100);
      fillLight = new THREE.DirectionalLight(new THREE.Color('hsl(240, 100%, 75%)'), 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('resize', onWindowResize, false);
      window.addEventListener('keydown', onKeyboardEvent, false);
      window.addEventListener('mousewheel', 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);

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

The above is the detailed content of three.js introductory example tutorial. For more information, please follow other related articles on the PHP Chinese website!