手写Unity相机旋转脚本

理理2024-10-302024-10-30

学三个月C#和一个月Unity后，试图边学边开发游戏，首先要解决的便是摄像机。
其实Unity是提供了名叫cinemamachine的插件的，功能强大，然而我不想用Unity提供的，想自己手写一个，于是写了一个。

using Unity.VisualScripting;
using UnityEngine;

public class CameraController : MonoBehaviour
{
    public Transform Target;
    [Header("设置相机看角色头顶多高位置")]
    public float upLook;
    [Header("相机竖直方向限制")]
    public float mYvalue;
    [Header("鼠标旋转灵敏度")]
    public float sensitivityMouseRotate = 100f;
    [Header("鼠标缩放灵敏度")]
    public float sensitivityMouse = 5f;
    [Header("相机和人物距离")]
    public float distance = 5f;

    private float mX = 0; // 累积X轴旋转
    private float mY = 0; // 累积Y轴旋转

    void LateUpdate()
    {
        Vector3 lookPosition = Target.position + Target.up * upLook;

        // 累积相机旋转的值
        mX += Input.GetAxis("Mouse X") * sensitivityMouseRotate * Time.deltaTime;
        mY -= Input.GetAxis("Mouse Y") * sensitivityMouseRotate * Time.deltaTime;
        mY = Mathf.Clamp(mY, -mYvalue, mYvalue);

        // 设置相机的旋转状态
        Quaternion myRotation = Quaternion.Euler(mY, mX, 0);

        // 设置distance值
        float scroll = Input.GetAxis("Mouse ScrollWheel");
        distance -= scroll * sensitivityMouse * 0.5f;
        distance = Mathf.Min(distance, 8f);
        distance = Mathf.Max(distance, 1.5f);

        // 更新相机的位置，使其与目标对象保持一定的距离
        Vector3 position = Target.position + Vector3.up * upLook - myRotation * Vector3.forward * distance;
        this.transform.position = position;
        this.transform.rotation = myRotation;
        this.transform.LookAt(lookPosition);
    }
}