有物体围绕载体点 [英] Have object revolve around vector point

问题描述

我目前正在寻找一种方法来有一个对象轨道上的向量坐标0,0,0。 例如，如果该对象位于X300，Y50，Z200比我想它围绕0,0,0但我不希望调整Y轴。我不是伟大的数学，这被证明是很难把握的。

I am currently looking for a way to have an object orbit the vector coordinates 0,0,0. For instance if the object is located at X300,Y50,Z200 than I would like it to revolve around 0,0,0 but I don't want to adjust the Y axis. I'm not great with math and this is proving to be very difficult to grasp.

推荐答案

好了轨道意味着你有一个轴。 （0，0，0）仅仅是在三维空间中的一个点，所以你需要或是其他的点（-3，8，4）然后创建从标准化的轴。如果您使用的是Three.js Object3D 你可以简单地归一化 objects.up 属性。但是，我离题了，这里有一个简单的矢量例如：

Well an orbit implies you have an axis. (0, 0, 0) is just a point in 3D space, so you'll need either another point ( -3, 8, 4 ) to then create a normalized axis from. If you use a Three.js Object3D you can simply normalize the objects.up property. But I digress, here's a simple vector example:

var startPoint = new THREE.Vector3( 0, 0, 0 );
var axisVector = new THREE.Vector3( -3, 8, 4);
var endPoint = new THREE.Vector3( 300, 50, 200 );
var rotation = 0.05;

var axis = startPoint.clone().sub(axisVector).normalize();
endPoint.applyAxisAngle( axis, rotation );

下面是一个使用两个立方体小提琴代替裸 Vector3类型的这里希望帮助！

Here's a fiddle using two cubes instead of bare Vector3's here Hope that helps!

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