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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              <div id="canvas"></div>
            
          
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CSS

            
              * {
  margin: 0;
  padding: 0;
}
html {
  height: 100%;
}
body {
  height: 100%;
  overflow: hidden;
}
canvas {
  position: absolute;
}
            
          
!

JS

            
              (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
var exports = {
  getRandomInt: function(min, max){
    return Math.floor(Math.random() * (max - min)) + min;
  },
  getDegree: function(radian) {
    return radian / Math.PI * 180;
  },
  getRadian: function(degrees) {
    return degrees * Math.PI / 180;
  },
  getSpherical: function(rad1, rad2, r) {
    var x = Math.cos(rad1) * Math.cos(rad2) * r;
    var z = Math.cos(rad1) * Math.sin(rad2) * r;
    var y = Math.sin(rad1) * r;
    return [x, y, z];
  }
};

module.exports = exports;

},{}],2:[function(require,module,exports){
var Util = require('./util');

var exports = function(){
  var Camera = function() {
    this.rad1 = Util.getRadian(60);
    this.rad2 = Util.getRadian(30);
    this.range = 1000;
    this.obj;
  };
  
  Camera.prototype = {
    init: function(width, height) {
      this.obj = new THREE.PerspectiveCamera(35, width / height, 1, 10000);
      this.obj.up.set(0, 1, 0);
      this.setPosition();
      this.lookAtCenter();
    },
    reset: function() {
      this.setPosition();
      this.lookAtCenter();
    },
    resize: function(width, height) {
      this.obj.aspect = width / height;
      this.obj.updateProjectionMatrix();
    },
    setPosition: function() {
      var points = Util.getSpherical(this.rad1, this.rad2, this.range);
      this.obj.position.set(points[0], points[1], points[2]);
    },
    lookAtCenter: function() {
      this.obj.lookAt({
        x: 0,
        y: 0,
        z: 0
      });
    }
  };

  return Camera;
};

module.exports = exports();

},{"./util":8}],3:[function(require,module,exports){
module.exports = function(object, eventType, callback){
  var timer;

  object.addEventListener(eventType, function(event) {
    clearTimeout(timer);
    timer = setTimeout(function(){
      callback(event);
    }, 500);
  }, false);
};

},{}],4:[function(require,module,exports){
var exports = {
  friction: function(acceleration, mu, normal, mass) {
    var force = acceleration.clone();
    if (!normal) normal = 1;
    if (!mass) mass = 1;
    force.multiplyScalar(-1);
    force.normalize();
    force.multiplyScalar(mu);
    return force;
  },
  drag: function(acceleration, value) {
    var force = acceleration.clone();
    force.multiplyScalar(-1);
    force.normalize();
    force.multiplyScalar(acceleration.length() * value);
    return force;
  },
  hook: function(velocity, anchor, rest_length, k) {
    var force = velocity.clone().sub(anchor);
    var distance = force.length() - rest_length;
    force.normalize();
    force.multiplyScalar(-1 * k * distance);
    return force;
  }
};

module.exports = exports;

},{}],5:[function(require,module,exports){
var Util = require('./util');

var exports = function(){
  var HemiLight = function() {
    this.rad1 = Util.getRadian(60);
    this.rad2 = Util.getRadian(30);
    this.range = 0;
    this.obj;
  };
  
  HemiLight.prototype = {
    init: function(scene, rad1, rad2, range, hex1, hex2, intensity) {
      this.range = range;
      this.obj = new THREE.HemisphereLight(hex1, hex2, intensity);
      this.setPosition();
      scene.add(this.obj);
    },
    setPosition: function() {
      var points = Util.getSpherical(this.rad1, this.rad2, this.range);
      this.obj.position.set(points[0], points[1], points[2]);
    }
  };
  
  return HemiLight;
};

module.exports = exports();

},{"./util":8}],6:[function(require,module,exports){
var Util = require('./Util');
var debounce = require('./debounce');
var Camera = require('./camera');
var HemiLight = require('./hemiLight');
var Mover = require('./mover');

var body_width = document.body.clientWidth;
var body_height = document.body.clientHeight;
var last_time_activate = Date.now();

var canvas = null;
var renderer = null;
var scene = null;
var camera = null;
var light = null;

var movers_num = 50000;
var movers = [];
var points_geometry = null;
var points_material = null;
var points = null;

var antigravity = new THREE.Vector3(0, 5, 0);

var initThree = function() {
  canvas = document.getElementById('canvas');
  renderer = new THREE.WebGLRenderer({
    antialias: true
  });
  if (!renderer) {
    alert('Three.jsの初期化に失敗しました。');
  }
  renderer.setSize(body_width, body_height);
  canvas.appendChild(renderer.domElement);
  renderer.setClearColor(0x111111, 1.0);
  
  scene = new THREE.Scene();
  scene.fog = new THREE.Fog(0x000000, 800, 1600);
  
  camera = new Camera();
  camera.init(body_width, body_height);
  
  light = new HemiLight();
  light.init(scene, Util.getRadian(30), Util.getRadian(60), 1000, 0x77ffaa, 0x77ffaa, 1);
  
  // var dummy_geometry = new THREE.BoxGeometry(100, 100, 100);
  // var dummy_material = new THREE.MeshLambertMaterial({
  //   color: 0xffffff
  // });
  // var dummy_obj = new THREE.Mesh(dummy_geometry, dummy_material);
  // scene.add(dummy_obj);
};

var init = function() {
  initThree();
  buildPoints();
  renderloop();
  debounce(window, 'resize', function(event){
    resizeRenderer();
  });
};

var activateMover = function () {
  var count = 0;

  for (var i = 0; i < movers.length; i++) {
    var mover = movers[i];
    
    if (mover.is_active) continue;
    mover.activate();
    mover.velocity.y = -300;
    count++;
    if (count >= 80) break;
  }
};

var buildPoints = function() {
  points_geometry = new THREE.Geometry();
  points_material = new THREE.PointsMaterial({
    color: 0x77ffaa,
    size: 6,
    transparent: true,
    opacity: 0.5,
    depthTest: false,
    blending: THREE.AdditiveBlending,
  });
  points_geometry2 = new THREE.Geometry();
  points_material2 = new THREE.PointsMaterial({
    color: 0x77aaff,
    size: 6,
    transparent: true,
    opacity: 0.5,
    depthTest: false,
    blending: THREE.AdditiveBlending,
  });
  for (var i = 0; i < movers_num; i++) {
    var mover = new Mover();
    var range = (1 - Math.log(Util.getRandomInt(2, 256)) / Math.log(256)) * 500;
    var rad = Util.getRadian(Util.getRandomInt(0, 360));
    var x = Math.cos(rad) * range;
    var z = Math.sin(rad) * range;
    mover.init(new THREE.Vector3(x, 1000, z));
    mover.mass = Util.getRandomInt(300, 500) / 100;
    movers.push(mover);
    if (i % 2 === 0) {
      points_geometry.vertices.push(mover.position);
    } else {
      points_geometry2.vertices.push(mover.position);
    }
  }
  points = new THREE.Points(points_geometry, points_material);
  points2 = new THREE.Points(points_geometry2, points_material2);
  scene.add(points);
  scene.add(points2);
};

var updatePoints = function() {
  var points_vertices = [];
  var points_vertices2 = [];
  for (var i = 0; i < movers.length; i++) {
    var mover = movers[i];
    if (mover.is_active) {
      mover.applyForce(antigravity);
      mover.updateVelocity();
      mover.updatePosition();
      if (mover.position.y > 500) {
        var range = (1 - Math.log(Util.getRandomInt(2, 256)) / Math.log(256)) * 500;
        var rad = Util.getRadian(Util.getRandomInt(0, 360));
        var x = Math.cos(rad) * range;
        var z = Math.sin(rad) * range;
        mover.init(new THREE.Vector3(x, -300, z));
        mover.mass = Util.getRandomInt(300, 500) / 100;
      }
    }
    if (i % 2 === 0) {
      points_vertices.push(mover.position);
    } else {
      points_vertices2.push(mover.position);
    }
  }
  points.geometry.vertices = points_vertices;
  points.geometry.verticesNeedUpdate = true;
  points2.geometry.vertices = points_vertices2;
  points2.geometry.verticesNeedUpdate = true;
};

var rotateCamera = function() {
  camera.rad2 += Util.getRadian(0.2);
  camera.reset();
}

var render = function() {
  renderer.clear();
  updatePoints();
  rotateCamera();
  renderer.render(scene, camera.obj);
};

var renderloop = function() {
  var now = Date.now();
  requestAnimationFrame(renderloop);
  render();
  if (now - last_time_activate > 10) {
    activateMover();
    last_time_activate = Date.now();
  }
};

var resizeRenderer = function() {
  body_width  = document.body.clientWidth;
  body_height = document.body.clientHeight;
  renderer.setSize(body_width, body_height);
  camera.resize(body_width, body_height);
};

init();

},{"./Util":1,"./camera":2,"./debounce":3,"./hemiLight":5,"./mover":7}],7:[function(require,module,exports){
var Util = require('./util');
var Force = require('./force');

var exports = function(){
  var Mover = function() {
    this.position = new THREE.Vector3();
    this.velocity = new THREE.Vector3();
    this.acceleration = new THREE.Vector3();
    this.anchor = new THREE.Vector3();
    this.mass = 1;
    this.r = 0;
    this.g = 0;
    this.b = 0;
    this.a = 1;
    this.time = 0;
    this.is_active = false;
  };
  
  Mover.prototype = {
    init: function(vector) {
      this.position = vector.clone();
      this.velocity = vector.clone();
      this.anchor = vector.clone();
      this.acceleration.set(0, 0, 0);
      this.a = 1;
      this.time = 0;
    },
    updatePosition: function() {
      this.position.copy(this.velocity);
    },
    updateVelocity: function() {
      this.acceleration.divideScalar(this.mass);
      this.velocity.add(this.acceleration);
      // if (this.velocity.distanceTo(this.position) >= 1) {
      //   this.direct(this.velocity);
      // }
    },
    applyForce: function(vector) {
      this.acceleration.add(vector);
    },
    applyFriction: function() {
      var friction = Force.friction(this.acceleration, 0.1);
      this.applyForce(friction);
    },
    applyDragForce: function(value) {
      var drag = Force.drag(this.acceleration, value);
      this.applyForce(drag);
    },
    hook: function(rest_length, k) {
      var force = Force.hook(this.velocity, this.anchor, rest_length, k);
      this.applyForce(force);
    },
    activate: function () {
      this.is_active = true;
    },
    inactivate: function () {
      this.is_active = false;
    }
  };

  return Mover;
};

module.exports = exports();

},{"./force":4,"./util":8}],8:[function(require,module,exports){
arguments[4][1][0].apply(exports,arguments)
},{"dup":1}]},{},[6])

            
          
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