Camera.main

描述

第一个被启用的并标记为“MainCamera”的 Camera 组件（只读）。

如果没有被启用的并标记为“MainCamera”的 Camera 组件，此属性将为 null。

在内部，Unity 会缓存所有标记为“MainCamera”的 GameObject。当您访问此属性时，Unity 会从其缓存中返回第一个有效结果。访问此属性会产生少量的 CPU 开销，类似于调用 GameObject.GetComponent。在 CPU 性能至关重要的情况下，请考虑缓存此属性。

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//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;
            }
        }
    }
}