摄像机围绕物体旋转观察

虽然代码可能不多，但是希望能给大家带来一些帮助

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class CameraItem : MonoBehaviour {

    //摄像机所要观察的物体

    public Transform target;

    //摄像机距离物体的距离  这里我们初始默认的是5

    public float distance = 5f;

    //摄像机相对于物体的旋转速度

    private float speedX = 240;

    private float speedY = 120;

    //限定摄像机只能旋转的角度

    private float minLimitY = -40f;

    private float maxLimitY = 240f;

    //这两个值用于保存摄像机自身的一个角度

    private float mX = 0.0f;

    private float mY = 0.0f;

    //这两个值用于限定摄像机距离物体的最大值和最小值

    public float maxDistance = 2;

    public float minDistance = 0.5f;

    //鼠标滚轮拉近镜头的速度

    private float zoomSpeed = 2f;

    public bool isNeedDamping = true;

    public float damping = 2.5f;

    void Start()

    {

        mX = transform.eulerAngles.x;

        mY = transform.eulerAngles.y;

    }

    void LateUpdate()

    {

        if (target != null && Input.GetMouseButton(0))

        {

            mX += Input.GetAxis("Mouse X") * speedX * Time.deltaTime;

            mY -= Input.GetAxis("Mouse Y") * speedY * Time.deltaTime;

            mY = ClampAngle(mY, minLimitY, maxLimitY);

        }

        distance -= Input.GetAxis("Mouse ScrollWheel") * zoomSpeed;

        distance = Mathf.Clamp(distance, minDistance, maxDistance);

        Quaternion mRotation = Quaternion.Euler(mY, mX, 0);

        Vector3 mPosition = mRotation * new Vector3(0, 0, -distance) + target.position;

        if (isNeedDamping)

        {

            transform.rotation = Quaternion.Lerp(transform.rotation, mRotation, Time.deltaTime * damping);

            transform.position = Vector3.Lerp(transform.position, mPosition, Time.deltaTime * damping);

        }

        else

        {

            transform.rotation = mRotation;

            transform.position = mPosition;

        }

    }

    //限定角度

    private float ClampAngle(float angle, float min, float max)

    {

        if (angle < -360) angle += 360;

        if (angle > 360) angle -= 360;

        return Mathf.Clamp(angle, min, max);

    }

}