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

public class NomalDemo : MonoBehaviour
{
    [SerializeField]
    private GameObject ground;//地面
    void Start()
    {
        this.StickOnGround();
    }
    /// <summary>
    /// 贴在地面上
    /// </summary>
    private void StickOnGround()
    {
        RaycastHit hitInfo;//用来得到射线碰撞的信息
        Vector3 capsuleColliderCenterInWorldSpace = 
            GetComponent<CapsuleCollider>().
            transform.TransformPoint(GetComponent<CapsuleCollider>().center);//得到胶囊的中心点
        bool isHit = Physics.Raycast(
            capsuleColliderCenterInWorldSpace, 
            new Vector3(0f, -1f, 0f), 
            out hitInfo, 100f, 
            LayerMask.GetMask("Default")
            );//从胶囊的中心垂直向下发射射线
        if (isHit)
        {
            Vector3 forward = this.transform.forward;
            Vector3 left = Vector3.Cross(forward, hitInfo.normal);//确定左的方向
            Vector3 newForward = Vector3.Cross(hitInfo.normal, left);//新的正方向
            this.transform.rotation = Quaternion.LookRotation(newForward, hitInfo.normal);
            this.transform.position = hitInfo.point;//设置位置,紧贴地面
        }
    }

    // Update is called once per frame
    void Update()
    {
        
    }
}