Transform.InverseTransformPoint

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

public [Vector3](https://docs.unity3d.com/cn/2019.4/ScriptReference/Vector3.html) **InverseTransformPoint** ([Vector3](https://docs.unity3d.com/cn/2019.4/ScriptReference/Vector3.html) **position**);

## 描述

将 `position` 从世界空间变换到本地空间。

该函数基本上与 [Transform.TransformPoint](https://docs.unity3d.com/cn/2019.4/ScriptReference/Transform.TransformPoint.html) 相反，后者用于从本地空间转换到世界空间。

注意，返回的位置受缩放影响。如果要处理方向矢量而不是位置，请使用 [Transform.InverseTransformDirection](https://docs.unity3d.com/cn/2019.4/ScriptReference/Transform.InverseTransformDirection.html)。

```
// Calculate the transform's position relative to the camera.
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public Transform cam;
    public Vector3 cameraRelative;

void Start()
    {
        cam = Camera.main.transform;
        Vector3 cameraRelative = cam.InverseTransformPoint(transform.position);

if (cameraRelative.z > 0)
            print("The object is in front of the camera");
        else
            print("The object is behind the camera");
    }
}
```

---

public [Vector3](https://docs.unity3d.com/cn/2019.4/ScriptReference/Vector3.html) **InverseTransformPoint** (float **x**, float **y**, float **z**);

## 描述

将位置 `z`、`z`、`z` 从世界空间变换到本地空间。与 Transform.TransformPoint 相反。

注意，返回的位置受缩放影响。如果要处理方向，请使用 [Transform.InverseTransformDirection](https://docs.unity3d.com/cn/2019.4/ScriptReference/Transform.InverseTransformDirection.html)。

```
// Calculate the world origin relative to this transform.
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    void Start()
    {
        Vector3 relativePoint = transform.InverseTransformPoint(0, 0, 0);

if (relativePoint.z > 0)
            print("The world origin is in front of this object");
        else
            print("The world origin is behind of this object");
    }
}
```