javascript - Visual glitch in a three.js animation -


i coding animation using three.js (r76) and, while works fine on computer, friend got visual glitch when running it. object leaves trace upon rotation, can seen in screenshot:

screenshot

here mwe, able reproduce bug.

var camera, scene, group, renderer, container, stats;    var width = 450;  var height = 400;  var mouse = new three.vector2(-1, -1);  var clic = false;  var mouseglob = new three.vector2();  var raycaster = new three.raycaster();  var pause = false;  var inters = 0;    function init() {        scene = new three.scene()      camera = new three.orthographiccamera(-width/2, width/2, -height/2, height/2, 1, 1000);      camera.position.z = 300;      scene.add(camera);        atomradius = 50;      var segments = 15,          rings = 15,          bondlength = 2*atomradius*1.5          bondradius = 10,          atompos = bondlength/math.sqrt(3);      var atom = new three.spheregeometry(atomradius, segments, rings);      var material = new three.meshbasicmaterial({color:0x6f919a,wireframe:true, opacity:0.8});      var flash = new three.meshbasicmaterial({color:0xff0000,wireframe:true});            var atomc = new three.mesh(atom, material.clone());            atomcl1 = new three.mesh(atom, material.clone());      atomcl1.position.set(atompos,atompos,atompos);            atomcl2 = new three.mesh(atom, material.clone());      atomcl2.position.set(atompos,-atompos,-atompos);        	  group = new three.object3d();      group.add(atomc);      group.add(atomcl1);      group.add(atomcl2);            scene.add(group);            container = document.getelementbyid('plan').getelementsbytagname('canvas')[0];      renderer = new three.webglrenderer({canvas: container, alpha: true});      renderer.setsize(width, height);            container.onmouseout = function(event){pause = false;};      container.onmouseover = function(){pause = true;};      stats = new stats();      document.getelementbyid('plan').appendchild(stats.domelement);  }    function animate() {      requestanimationframe(animate);      render();      stats.update();  }    function render() {      if(!pause) {          group.rotation.x += .004;          group.rotation.y += .008;      }      renderer.render(scene, camera);  }    init();  animate();
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r76/three.min.js"></script>  <script src="https://cdnjs.cloudflare.com/ajax/libs/stats.js/r16/stats.min.js"></script>  <div id="plan">  <canvas></canvas>  </div>

this glitch appears on both of computers, using firefox 47.0.1 on windows 7, intel hd graphics 4000. animation runs @ 60 fps.

i had animation tested 5 other people (including myself) in google chrome, firefox, internet explorer, safari , safari ios on windows 7, windows 10, ubuntu 14.04 , mac os x , not reproduce glitch.

i not find related problem on google or wasn't able correctly describe problem in searches.

does know origin of problem , how can solve ?

thank can provide.


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