Unity中使用RawImage和RenderTexture在UI界面上投影其他相机拍摄的内容，并实现控制投影在RawImage中摄像机的移动

a.单纯的用小窗显示物体

个人认为所谓的 “ 物体A跟随物体B运动 ” 表现为：二者表现为运动（平移、旋转）方向，速度在任何时刻表现一致。

1.在Project界面创建RenderTexture

2.在Hierarchy界面创建RawImage

3.选中第二个摄像机,将New Render Texture挂载上

4.选中RawImage,将New Render Texture挂载上

最终效果如下图所示

b.当小窗显示时,可以控制小窗移动

场景中有两个摄像机,分别挂在不同的脚本

第一个脚本MoveScript.cs

using UnityEngine;
using System.Collections;

public class MoveScript : MonoBehaviour {
   
   

    public enum RotationAxes {
   
    MouseXAndY = 0, MouseX = 1, MouseY = 2 }
    public RotationAxes axes = RotationAxes.MouseXAndY;

    public float sensitivityX = 15F;
    public float sensitivityY = 15F;

    public float minimumX = -360F;
    public float maximumX = 360F;

    public float minimumY = -60F;
    public float maximumY = 60F;
    
    public static bool isEnableMove;

    float moveSensitivity = 1.0f;

    float rotationX = 0F;
    float rotationY = 0F;

    //Quaternion originalRotation;
    //鼠标缩放
    public float sensitivity = 60f;
    public float minFov = 50f;
    public float maxFov = 70f;

    public float speedMove = 10f;
    private float speed;

     void Start()
    {
   
   
        // Make the rigid body not change rotation
        if (GetComponent<Rigidbody>())
            GetComponent<Rigidbody>().freezeRotation = true;
       // originalRotation = transform.localRotation;
        speed = speedMove;
        isEnableMove = true;
    }

    void Update()
    {
   
   
        fnRotate();
        if (isEnableMove)
            fnMove();
       // fnScroll();
    }
  
    void fnRotate()
    {
   
   
        CharacterController controller = gameObject.GetComponent<CharacterController>();
        if (Input.GetMouseButton(1))//0对应左键 ， 1对应右键 ， 2对应中键
        {
   
   
            if (axes == RotationAxes.MouseXAndY)
            {
   
   
                float rotationX