围绕世界轴旋转对象(Rotate object around world axis)

我正在尝试围绕世界轴旋转一个对象。我发现了这个问题：如何在轴世界three.js上旋转一个对象？

但是它并没有通过使用这个函数来解决问题：

var rotWorldMatrix; // Rotate an object around an arbitrary axis in world space function rotateAroundWorldAxis(object, axis, radians) { rotWorldMatrix = new THREE.Matrix4(); rotWorldMatrix.makeRotationAxis(axis.normalize(), radians); rotWorldMatrix.multiplySelf(object.matrix); // pre-multiply object.matrix = rotWorldMatrix; object.rotation.getRotationFromMatrix(object.matrix, object.scale); }

multiplySelf和getRotationFromMatrix没有定义（我收到控制台错误）。如何解决这个问题？

更新

我试图使用Quaternion ，但它似乎不正确。我试图根据用户点击旋转一个对象，这是我写的功能：

function mouseUp(event) { var x= event.clientX; var y= event.clientY; var dx= (x - xBegin); var dy= (y - yBegin); var quaternion= new THREE.Quaternion(); quaternion.setFromAxisAngle(new THREE.Quaternion(dy,dx,0).normalize(),Math.sqrt(dx*dx+dy*dy)/250.0); object.quaternion.multiplyQuaternions(quaternion,object.quaternion); }

只要物体处于垂直或水平位置，它就会正确旋转，但是如果它与x轴成45度角，它会非常缓慢地旋转并沿着与咔哒声相反的方向旋转。

I am trying to rotate an object around the world axis. I've found this question: How to rotate a object on axis world three.js?

But it didn't solve the problem by using this function:

var rotWorldMatrix; // Rotate an object around an arbitrary axis in world space function rotateAroundWorldAxis(object, axis, radians) { rotWorldMatrix = new THREE.Matrix4(); rotWorldMatrix.makeRotationAxis(axis.normalize(), radians); rotWorldMatrix.multiplySelf(object.matrix); // pre-multiply object.matrix = rotWorldMatrix; object.rotation.getRotationFromMatrix(object.matrix, object.scale); }

multiplySelf and getRotationFromMatrix are not defined (I'm getting a console error). How to fix the problem?

Update

I tried to use Quaternion, but it doesn't seem to behave correctly. I'm trying to rotate an object according to the user click, this is the function that I've written:

function mouseUp(event) { var x= event.clientX; var y= event.clientY; var dx= (x - xBegin); var dy= (y - yBegin); var quaternion= new THREE.Quaternion(); quaternion.setFromAxisAngle(new THREE.Quaternion(dy,dx,0).normalize(),Math.sqrt(dx*dx+dy*dy)/250.0); object.quaternion.multiplyQuaternions(quaternion,object.quaternion); }

It rotates correctly as long as the object is in vertical or horizontal position, but if it's for example at 45 degrees from the x axis, it rotates very slowly and in the opposite direction of the click.