CinemachineVirtualCamera实现自由相机

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

public class FreeCameraController : MonoBehaviour
{
    public CinemachineVirtualCamera vcamera;
    public Transform target;
    public float TopClamp = 85.0f;
    public float BottomClamp = -10.0f;
    public float Speed = 3.0f;
    public bool Invert;

    private float cinemachineTargetYaw;
    private float cinemachineTargetPitch;

    private Cinemachine3rdPersonFollow vcameraFollow;
    private float vcameraDistance;
    void Start()
    {
        cinemachineTargetPitch = target.rotation.eulerAngles.x;
        cinemachineTargetYaw = target.rotation.eulerAngles.y;

        vcameraFollow = vcamera.GetCinemachineComponent<Cinemachine3rdPersonFollow>();
        vcameraDistance = vcameraFollow.CameraDistance;
    }

    void LateUpdate()
    {
        CameraRotation();
    }

    private void CameraRotation()
    {
        var input = new Vector2(Input.GetAxis("Mouse X"), -Input.GetAxis("Mouse Y"));
        bool left = Input.GetMouseButton(0);
        bool right = Input.GetMouseButton(1);
        if (Invert)
        {
            bool temp = left;
            left = right;
            right = temp;
        }
        if (right)
        {
            if (input.sqrMagnitude >= 0.01f)
            {
                cinemachineTargetYaw += input.x * Speed;
                cinemachineTargetPitch += input.y * Speed;
            }

            cinemachineTargetYaw = ClampAngle(cinemachineTargetYaw, float.MinValue, float.MaxValue);
            cinemachineTargetPitch = ClampAngle(cinemachineTargetPitch, BottomClamp, TopClamp);

            transform.rotation = Quaternion.Euler(0.0f, cinemachineTargetYaw, 0.0f);
            target.rotation = Quaternion.Euler(cinemachineTargetPitch, cinemachineTargetYaw, 0.0f);
        }
        if (left)
        {
            transform.Translate(-input.x, 0f, input.y);
        }
        vcameraDistance -= Input.GetAxis("Mouse ScrollWheel") * 10.0f;
        vcameraDistance = Mathf.Clamp(vcameraDistance, 2.0f, 20.0f);
        vcameraFollow.CameraDistance = Mathf.Lerp(vcameraFollow.CameraDistance, vcameraDistance, Time.deltaTime * 5.0f);

    }

    private static float ClampAngle(float lfAngle, float lfMin, float lfMax)
    {
        if (lfAngle < -360f) lfAngle += 360f;
        if (lfAngle > 360f) lfAngle -= 360f;
        return Mathf.Clamp(lfAngle, lfMin, lfMax);
    }
}
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