Camera.WorldToViewportPoint 世界转视窗位置

# [Camera](Camera.html).WorldToViewportPoint 世界转视窗位置

function *WorldToViewportPoint* (*position* : [Vector3](../Vector3/Vector3.html)) : [Vector3](../Vector3/Vector3.html)

*Description* 描述

Transforms position from world space into viewport space.

从世界空间到视窗空间的变换位置。

Viewport space is normalized and relative to the camera. The bottom-left of
the camera is (0,0); the top-right is (1,1). The z position is in world units
from the camera.

视口空间是归一化的并相对于相机的。相机的左下为（0,0）；右上是（1,1），Z 的位置是以世界单位衡量的到相机的距离。

* [C#](#)
* [JavaScript](#)

```
using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public Transform target;
	void Update() {
		Vector3 viewPos = camera.WorldToViewportPoint(target.position);
		if (viewPos.x > 0.5F)
			print("target is on the right side!");
		else
			print("target is on the left side!");
	}
}
```

```
// Finds out whether target is on the left or right side of the screen
//Target在屏幕的左边还是右边
var target : Transform;

function Update () {
	var viewPos : Vector3 = camera.WorldToViewportPoint (target.position);
	// viewport coordinates range from zero to one
	//视口坐标范围从0到1
	if( viewPos.x > 0.5 )
		print ("target is on the right side!");
	else
		print ("target is on the left side!");
	}
```