threejs实现文字粒子拆分动画效果代码-html代码-BFW代码库

代码语言：html

所属分类：粒子

代码描述：threejs实现文字粒子拆分动画效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<html lang="en"><head>

  <meta charset="UTF-8">

  
  
<style>
body {
	margin: 0;
	overflow: hidden;
}

#instructions {
	position: absolute;
	color: #fff;
	bottom: 0;
	padding-bottom: 6px;
	font-family: sans-serif;
	width: 100%;
	text-align: center;
	pointer-events: none;
}
</style>


</head>

<body style="cursor: pointer;">
  <div id="three-container"></div>

<div id="instructions">
	click and drag to control the animation
</div>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/three.75.js"></script>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/three.bas.js"></script>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/TextGeometry.js"></script>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/FontUtils.js"></script>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/pnltri.min.js"></script>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/droid_sans_bold.typeface.js"></script>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/TweenMax.min.js"></script>
  
      <script>
//capture the window loading
window.onload = init;

function init() {
  var root = new THREERoot({
    createCameraControls:false,
		antialias: true,
    fov:60
  });
    
//setup the scene
    
  root.renderer.setClearColor(0x3AAFA9); 
  root.renderer.setPixelRatio(window.devicePixelRatio || 1);
  root.camera.position.set(0, 0, 400);


//create the text animation variable
    
  var textAnimation = createTextAnimation();
  textAnimation.position.y = -10; 
  root.scene.add(textAnimation);

 //set the timeline aspects of the animation
    
  var tl = new TimelineMax({
    repeat:-1, //-1 loop
    repeatDelay:0.25,
    yoyo:true
  });
  tl.fromTo(textAnimation, 4, //4
    {animationProgress:0.0},
    {animationProgress:1.0, ease:Power1.easeInOut},
    0
  );

  createTweenScrubber(tl);
}

//create the text to be animated

function createTextAnimation() {
  var geometry = generateTextGeometry('BFW.WIKI', {
    size:14,
    height:0,
    font:'droid sans',
    weight:'bold',
    style:'normal',
    anchor:{x:0.5, y:0.5, z:0.0}
  });

  THREE.BAS.Utils.separateFaces(geometry);

  return new TextAnimation(geometry);
}

//mathematical details of the animation

function generateTextGeometry(text, params) {
  var geometry = new THREE.TextGeometry(text, params);

  geometry.computeBoundingBox();

  geometry.userData = {};
  geometry.userData.size = {
    width: geometry.boundingBox.max.x - geometry.boundingBox.min.x,
    height: geometry.boundingBox.max.y - geometry.boundingBox.min.y,
    depth: geometry.boundingBox.max.z - geometry.boundingBox.min.z
  };

  var anchorX = geometry.userData.size.width * -params.anchor.x;
  var anchorY = geometry.userData.size.height * -params.anchor.y;
  var anchorZ = geometry.userData.size.depth * -params.anchor.z;
  var matrix = new THREE.Matrix4().makeTranslation(anchorX, anchorY, anchorZ);

  geometry.applyMatrix(matrix);

  return geometry;
} 


////////////////////
// CLASSES
////////////////////

function TextAnimation(textGeometry) {
  var bufferGeometry = new THREE.BAS.ModelBufferGeometry(textGeometry);

  var aAnimation = bufferGeometry.createAttribute('aAnimation', 2);
  var aCentroid = bufferGeometry.createAttribute('aCentroid', 3);
  var aControl0 = bufferGeometry.createAttribute('aControl0', 3);
  var aControl1 = bufferGeometry.createAttribute('aControl1', 3);
  var aEndPosition = bufferGeometry.createAttribute('aEndPosition', 3);

  var faceCount = bufferGeometry.faceCount;
  var i, i2, i3, i4, v;

  var size = textGeometry.userData.size;

  var maxDelayX = 2.0;
  var maxDelayY = 0.25;
  var minDuration = 2;
  var maxDuration = 8;
  var stretch = 0.25;

  this.animationDuration = maxDelayX + maxDelayY + maxDuration - 3;
  this._animationProgress = 0;

  for (i = 0, i2 = 0, i3 = 0, i4 = 0; i < faceCount; i++, i2 += 6, i3 += 9, i4 += 12) {
    var face = textGeometry.faces[i];
    var centroid = THREE.BAS.Utils.computeCentroid(textGeometry, face);

    // animation
    var delayX = Math.max(0, (centroid.x / size.width) * maxDelayX);
    var delayY = Math.max(0, (1.0 - (centroid.y / size.height)) * maxDelayY);
    var duration = THREE.Math.randFloat(minDuration, maxDuration);

    for (v = 0; v < 6; v += 2) {
      aAnimation.array[i2 + v    ] = delayX + delayY + Math.random() * stretch;
      aAnimation.array[i2 + v + 1] = duration;
    }

    // centroid
    for (v = 0; v < 9; v += 3) {
      aCentroid.array[i3 + v    ] = centroid.x;
      aCentroid.array[i3 + v + 1] = centroid.y;
      aCentroid.array[i3 + v + 2] = centroid.z;
    }

    // ctrl
    var c0x = centroid.x + THREE.Math.randFloat(40, 120);
    var c0y = centroid.y + size.height * THREE.Math.randFloat(0.0, 12.0);
    var c0z = THREE.Math.randFloatSpread(120);

    var c1x = centroid.x + THREE.Math.randFloat(80, 120) * -1;
    var c1y = centroid.y + size.height * THREE.Math.randFloat(0.0, 12.0);
    var c1z = THREE.Math.randFloatSpread(120);

    for (v = 0; v < 9; v += 3) {
      aControl0.array[i3 + v    ] = c0x;
      aControl0.array[i3 + v + 1] = c0y;
      aControl0.array[i3 + v + 2] = c0z;

      aControl1.array[i3 + v    ] = c1x;
      aControl1.array[i3 + v + 1] = c1y;
      aControl1.array[i3 + v + 2] = c1z;
    }

    // en.........完整代码请登录后点击上方下载按钮下载查看