Camera.WorldToViewportPoint

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

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

public [Vector3](https://docs.unity3d.com/cn/2019.4/ScriptReference/Vector3.html) **WorldToViewportPoint** ([Vector3](https://docs.unity3d.com/cn/2019.4/ScriptReference/Vector3.html) **position**, [Camera.MonoOrStereoscopicEye](https://docs.unity3d.com/cn/2019.4/ScriptReference/Camera.MonoOrStereoscopicEye.html) **eye**);

## 参数

| eye | 可选参数，可用于指定要使用的眼睛变换。默认值为 Mono。 |
| ----- | ------------------------------------------------------- |

## 描述

将 `position` 从世界空间变换为视口空间。

视口空间是标准化的、相对于摄像机的空间。摄像机左下角为 (0,0)，右上角为 (1,1)。z 位置为与摄像机的距离，采用世界单位。

```
// Finds out whether target is on the left or right side of the screen
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public Transform target;
    Camera cam;

void Start()
    {
        cam = GetComponent<Camera>();
    }

void Update()
    {
        Vector3 viewPos = cam.WorldToViewportPoint(target.position);
        if (viewPos.x > 0.5F)
            print("target is on the right side!");
        else
            print("target is on the left side!");
    }
}
```