让对象围绕矢量点旋转 [英] Have object revolve around vector point

问题描述

我目前正在寻找一种方法，让物体绕矢量坐标 0,0,0 运行.例如，如果对象位于 X300、Y50、Z200 处，我希望它围绕 0,0,0 旋转，但我不想调整 Y 轴.我不太擅长数学，事实证明这很难掌握.

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

轨道意味着你有一个轴.(0, 0, 0) 只是 3D 空间中的一个点，因此您需要另一个点 ( -3, 8, 4 ) 然后从中创建归一化轴.如果您使用 Three.js Object3D，您可以简单地规范化 objects.up 属性.但我离题了，这是一个简单的向量示例:

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 );

这是一个使用两个立方体代替裸 Vector3 的 here 的小提琴这有帮助！

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

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