Quaternion.RotateTowards

描述

将旋转 from 向 to 旋转。

将 from 四元数朝 to 旋转 maxDegreesDelta 的角度步长（但请注意， 该旋转不会过冲）。 如果 maxDegreesDelta 为负值，则向远离 to 的方向旋转，直到旋转 恰好为相反的方向。

using UnityEngine;

public class Example : MonoBehaviour
{
    // The object whose rotation we want to match.
    Transform target;

    // Angular speed in degrees per sec.
    float speed;

    void Update()
    {
        // The step size is equal to speed times frame time.
        var step = speed * Time.deltaTime;

        // Rotate our transform a step closer to the target's.
        transform.rotation = Quaternion.RotateTowards(transform.rotation, target.rotation, step);
    }
}