Vector3.SmoothDamp

# [Vector3](https://docs.unity3d.com/cn/2019.4/ScriptReference/Vector3.html).SmoothDamp

public static [Vector3](https://docs.unity3d.com/cn/2019.4/ScriptReference/Vector3.html) **SmoothDamp** ([Vector3](https://docs.unity3d.com/cn/2019.4/ScriptReference/Vector3.html) **current**, [Vector3](https://docs.unity3d.com/cn/2019.4/ScriptReference/Vector3.html) **target**, ref [Vector3](https://docs.unity3d.com/cn/2019.4/ScriptReference/Vector3.html) **currentVelocity**, float **smoothTime**, float **maxSpeed**= Mathf.Infinity, float **deltaTime**= Time.deltaTime);

## 参数

| current         | 当前位置。                                                |
| ----------------- | ----------------------------------------------------------- |
| target          | 尝试达到的目标。                                          |
| currentVelocity | 当前速度，此值由函数在每次调用时进行修改。                |
| smoothTime      | 达到目标所需的近似时间。值越小，达到目标的速度越快。      |
| maxSpeed        | 可以选择允许限制最大速度。                                |
| deltaTime       | 自上次调用此函数以来的时间。默认情况下为 Time.deltaTime。 |

## 描述

随时间推移将一个向量逐渐改变为所需目标。

向量通过某个类似于弹簧-阻尼的函数（它从不超过目标）进行平滑。 最常见的用法是用于平滑跟随摄像机。

```
// Smooth towards the target

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public Transform target;
    public float smoothTime = 0.3F;
    private Vector3 velocity = Vector3.zero;

void Update()
    {
        // Define a target position above and behind the target transform
        Vector3 targetPosition = target.TransformPoint(new Vector3(0, 5, -10));

// Smoothly move the camera towards that target position
        transform.position = Vector3.SmoothDamp(transform.position, targetPosition, ref velocity, smoothTime);
    }
}
```