three.js在其中心围绕Y轴旋转Object3d

问题描述

我在 Three.JS 中有一个 Object3d ，它是一组一些Mesh对象。

我想绕着Y轴在远离世界中心（0,0,0）的中心旋转该组。

我只知道 Group .rotate.y + = deg 代码，但是对于每个轴方向，它总是围绕（0,0,0）而不是我的组中心旋转对象！

我怎么能解决这个问题？

I have an Object3d in Three.JS that is a group of some Mesh objects.
I want to rotate this group around the Y axis, at it center, that is far from world center (0,0,0).
I just know the Group.rotate.y += deg code, but for each axis direction it always rotate the object around (0,0,0), not my group center!
How can i fix this?

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推荐答案

看看Object3D的 rotateOnAxis（axis，angle）函数。
应该是这样的：

Have a look at Object3D's rotateOnAxis(axis, angle) function.It should be something like:

//declared once at the top of your code
var axis = new THREE.Vector3(0.5,0.5,0);//tilted a bit on x and y - feel free to plug your different axis here
//in your update/draw function
rad += radIncrement;
object.rotateOnAxis(axis,rad);

HTH

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