Unity_SwitchCameraBetweenTargets

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CameraMultiTarget : MonoBehaviour
{
    public GameObject TargetA;
    public GameObject TargetB;

    GameObject ActiveTarget;
    Vector3 StartOffset = Vector3.zero;

    void Start()
    {
        //Make Target A the first target
        ActiveTarget = TargetA;
        //When we start we grab the distance to the target as a vector
        StartOffset = this.transform.position - ActiveTarget.transform.position;
    }

    void Update()
    {
        //When we press a button it changes the target
        if (Input.GetButtonUp("Fire2")))
        {
            //If target is A switch to B and return out of code, just switch to A if already B
            if (ActiveTarget == TargetA)
            {
                ActiveTarget = TargetB;
                return;
            }
            ActiveTarget = TargetA;
        }

    }

    private void FixedUpdate()
    {
        //We make the camera follow the object during the physics step
        this.transform.position = ActiveTarget.transform.position + StartOffset;
        //Then we make the camera look at the target
        this.transform.LookAt(ActiveTarget.transform);
    }
}