Camera.ViewportToScreenPoint

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

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

## 描述

将 `position` 从视口空间变换为屏幕空间。

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。

屏幕空间以像素定义。屏幕的左下角为 (0,0)，右上角 为 ([pixelWidth](https://docs.unity3d.com/cn/2019.4/ScriptReference/Camera-pixelWidth.html),[pixelHeight](https://docs.unity3d.com/cn/2019.4/ScriptReference/Camera-pixelHeight.html))。z 位置为与摄像机的距离，采用世界单位。

```
using UnityEngine;

public class Example : MonoBehaviour
{
    // Draw an image based on normalized view coordinates
    // rather than pixel positions.
    Texture2D bottomPanel;

void VPToScreenPtExample()
    {
        var origin = Camera.main.ViewportToScreenPoint(new Vector3(0.25f, 0.1f, 0));
        var extent = Camera.main.ViewportToScreenPoint(new Vector3(0.5f, 0.2f, 0));

GUI.DrawTexture(new Rect(origin.x, origin.y, extent.x, extent.y), bottomPanel);
    }
}
```