Camera.main

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

public static [Camera](https://docs.unity3d.com/cn/2019.4/ScriptReference/Camera.html) **main** ;

## 描述

第一个启用的摄像机标记为“MainCamera”。（只读）

场景中的主摄像机。如果场景中没有此类摄像机，则返回 /null/。 该属性在内部使用 FindGameObjectsWithTag 而不会将此结果缓存。如果每帧多次使用 [Camera.main](https://docs.unity3d.com/cn/2019.4/ScriptReference/Camera-main.html) 的返回值，建议将该值缓存。

```
//Place this script on a GameObject to switch between the main Camera and your own second Camera on the press of the "L" key
//Place a second Camera in your Scene and assign it as the "Camera Two" in the Inspector.

using UnityEngine;

public class Example : MonoBehaviour
{
    //This is Main Camera in the Scene
    Camera m_MainCamera;
    //This is the second Camera and is assigned in inspector
    public Camera m_CameraTwo;

void Start()
    {
        //This gets the Main Camera from the Scene
        m_MainCamera = Camera.main;
        //This enables Main Camera
        m_MainCamera.enabled = true;
        //Use this to disable secondary Camera
        m_CameraTwo.enabled = false;
    }

void Update()
    {
        //Press the L Button to switch cameras
        if (Input.GetKeyDown(KeyCode.L))
        {
            //Check that the Main Camera is enabled in the Scene, then switch to the other Camera on a key press
            if (m_MainCamera.enabled)
            {
                //Enable the second Camera
                m_CameraTwo.enabled = true;

//The Main first Camera is disabled
                m_MainCamera.enabled = false;
            }
            //Otherwise, if the Main Camera is not enabled, switch back to the Main Camera on a key press
            else if (!m_MainCamera.enabled)
            {
                //Disable the second camera
                m_CameraTwo.enabled = false;

//Enable the Main Camera
                m_MainCamera.enabled = true;
            }
        }
    }
}
```