javascript - THREE.js旋转副本不起作用

我有一个错误，我复制一个对象的Quaternion并将其传递给一个函数，该函数将其应用于另一个对象以保持其旋转同步。我无法将Quaternion应用于第二个对象。

给定对象1是msh并且对象2是msh2，此代码将不会将msh的旋转应用于msh2

  var rot = new THREE.Quaternion().copy(msh.rotation);
  msh2.rotation.copy(rot);

您可以在此Stack Snippet中进一步了解这一点，它以最小的可复制方式包含问题（但不是我在实际项目中使用的确切代码）

var renderer = new THREE.WebGLRenderer({canvas : $("#can")[0]});
renderer.setSize($("#can").width(), $("#can").height());
var cam = new THREE.PerspectiveCamera(45, $("#can").width() / $("#can").height(), 0.1, 100);
cam.position.set(0,2,6);
cam.quaternion.multiply(new THREE.Quaternion().setFromAxisAngle( new THREE.Vector3( 1, 0, 0 ), -Math.PI/8 ));
var scene = new THREE.Scene();

var geo = new THREE.BoxGeometry(1,1,1);
var mat = new THREE.MeshBasicMaterial({color : 0xff0000});
var msh = new THREE.Mesh(geo,mat);
scene.add(msh);

geo = new THREE.BoxGeometry(1,2,1);
mat = new THREE.MeshBasicMaterial({color : 0xff00ff});
var msh2 = new THREE.Mesh(geo,mat);
msh2.position.set(2,0,0);
scene.add(msh2);

function render() {
  requestAnimationFrame( render );
  msh.rotateX(0.001);
  msh.rotateY(0.002);
  //For some reason, this doesn't work??
  var rot = new THREE.Quaternion().copy(msh.rotation);
  msh2.rotation.copy(rot);
  //Yet this does (but it doesn't fit the flow of my
  //original project because I don't want to pass
  //objects around.
  //msh2.rotation.copy(msh.rotation);
  renderer.render( scene, cam );
}
render();

<script src="https://cdn.rawgit.com/mrdoob/three.js/dev/build/three.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<canvas id="can" width="400" height="300"></canvas>

Also see the JSFiddle here

我在这里想念什么吗？我一直都用Vector3这样做，所以我不明白为什么我不能在这里做...

最佳答案

msh.rotation是THREE.Euler的一个实例，但是您正在尝试与THREE.Quaternion进行复制。 msh2.rotation.copy（msh.rotation）应该可以正常工作，就像msh2.quaternion.copy（msh.quaternion）一样