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Three.js uses the trackball plug-in (trackball) to add interactive functions to the model. Detailed explanation of examples

巴扎黑Original: 2017-09-26 09:38:453292browse

This article mainly introduces to you the relevant information about how Three.js uses the trackball plug-in, that is, trackball to increase the interactive function of the model. The article introduces it in detail through the example code, which is very useful for everyone's study or work. It has certain reference and learning value. Friends who need it can take a look below.

Preface

Before we have briefly introduced some cases about getting started with three.js, this article will introduce in detail about Three. .js How to use the trackball plug-in (trackball) to increase the interactive function of the model? I won’t go into details below. Let’s take a look at the detailed introduction.

This is a component of three.js and requires additional import files. The file address is in the official download case examples/js/controls/TrackballControls.js.

You only need to set the relevant properties as in the case, and pass in the camera during instantiation. You can achieve interactive effects.

Achievable effects:

Hold down the left mouse button to rotate the model
Hold down the right button of the mouse and drag to move the model
The mouse wheel can zoom the model

##Case code:

<!DOCTYPE html> 
<html lang="en"> 
<head> 
 <meta charset="UTF-8"> 
 <title>Title</title> 
 <style type="text/css"> 
  html, body { 
   margin: 0; 
   height: 100%; 
  } 
 
  canvas { 
   display: block; 
  } 
 
 </style> 
</head> 
<body onload="draw();"> 
 
</body> 
<script src="build/three.js"></script> 
<script src="examples/js/controls/TrackballControls.js"></script> 
<script> 
 var renderer; 
 function initRender() { 
  renderer = new THREE.WebGLRenderer({antialias:true}); 
  renderer.setSize(window.innerWidth, window.innerHeight); 
  document.body.appendChild(renderer.domElement); 
 } 
 
 var camera; 
 function initCamera() { 
  camera = new THREE.PerspectiveCamera(45, window.innerWidth/window.innerHeight, 1, 10000); 
  camera.position.set(0, 0, 400); 
 } 
 
 var scene; 
 function initScene() { 
  scene = new THREE.Scene(); 
 } 
 
 var light; 
 function initLight() { 
  scene.add(new THREE.AmbientLight(0x404040)); 
 
  light = new THREE.DirectionalLight(0xffffff); 
  light.position.set(1,1,1); 
  scene.add(light); 
 } 
  
 function initModel() { 
  var map = new THREE.TextureLoader().load("examples/textures/UV_Grid_Sm.jpg"); 
  var material = new THREE.MeshLambertMaterial({map:map}); 
 
  var cube = new THREE.Mesh(new THREE.BoxGeometry(100, 200, 100, 1, 1, 1), material); 
  scene.add(cube); 
 } 
 
 //用户交互插件 鼠标左键按住旋转，右键按住平移，滚轮缩放 
 var controls; 
 function initControls() { 
  controls = new THREE.TrackballControls( camera ); 
  //旋转速度 
  controls.rotateSpeed = 5; 
  //变焦速度 
  controls.zoomSpeed = 3; 
  //平移速度 
  controls.panSpeed = 0.8; 
  //是否不变焦 
  controls.noZoom = false; 
  //是否不平移 
  controls.noPan = false; 
  //是否开启移动惯性 
  controls.staticMoving = false; 
  //动态阻尼系数 就是灵敏度 
  controls.dynamicDampingFactor = 0.3; 
  //未知，占时先保留 
  //controls.keys = [ 65, 83, 68 ]; 
  controls.addEventListener( &#39;change&#39;, render ); 
 } 
  
 function render() { 
  renderer.render( scene, camera ); 
 } 
 
 //窗口变动触发的函数 
 function onWindowResize() { 
 
  camera.aspect = window.innerWidth / window.innerHeight; 
  camera.updateProjectionMatrix(); 
  controls.handleResize(); 
  render(); 
  renderer.setSize( window.innerWidth, window.innerHeight ); 
 
 } 
 
 function animate() { 
  //更新控制器 
  controls.update(); 
  render(); 
  requestAnimationFrame(animate); 
 } 
 
 function draw() { 
  initRender(); 
  initScene(); 
  initCamera(); 
  initLight(); 
  initModel(); 
  initControls(); 
 
  animate(); 
  window.onresize = onWindowResize; 
 } 
</script> 
</html>

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