Unity中的移动和跳跃角色（《行动中的Unity》第一版）

Question

根据《行动中的团结》一书，我学习了第7章，我不知道我是在做错什么还是在书中犯了错误。通常，角色控制器会紧贴对象，结果漂浮在空中，因为它是一个胶囊对撞机，但是模型本身已不在设施中。这是我试图通过抛出光束来解决的方法

public class Walk : MonoBehaviour
{
    [SerializeField] private Transform target;

    public float moveSpeed = 6.0f;
    public float rotSpeed = 15.0f;
    public float jumpSpeed = 15.0f;
    public float gravity = -9.8f;
    public float terminalVelocity = -20.0f;
    public float minFall = -1.5f;

    private float _vertSpeed;
    private ControllerColliderHit _contact;

    private CharacterController _charController;


    void Start()
    {
        _vertSpeed = minFall;

        _charController = GetComponent<CharacterController>();
    }


    void Update()
    {


        Vector3 movement = Vector3.zero;


        float horInput = Input.GetAxis("Horizontal");
        float vertInput = Input.GetAxis("Vertical");
        if (horInput != 0 || vertInput != 0)
        {
            movement.x = horInput * moveSpeed;
            movement.z = vertInput * moveSpeed;
            movement = Vector3.ClampMagnitude(movement, moveSpeed);

            Quaternion tmp = target.rotation;
            target.eulerAngles = new Vector3(0, target.eulerAngles.y, 0);
            movement = target.TransformDirection(movement);
            target.rotation = tmp;


            Quaternion direction = Quaternion.LookRotation(movement);
            transform.rotation = Quaternion.Lerp(transform.rotation,
                                                 direction, rotSpeed * Time.deltaTime);
        }

        bool hitGround = false;
        RaycastHit hit;
        if (_vertSpeed < 0 && Physics.Raycast(transform.position, Vector3.down, out hit))
        {
            float check = (_charController.height + _charController.radius) / 1.9f;
            hitGround = hit.distance <= check; 
        }


        if (hitGround)
        {
            if (Input.GetButtonDown("Jump"))
            {
                _vertSpeed = jumpSpeed;
            }
            else
            {
                _vertSpeed = minFall;
            }
        }
        else
        {
            _vertSpeed += gravity * 5 * Time.deltaTime;
            if (_vertSpeed < terminalVelocity)
            {
                _vertSpeed = terminalVelocity;
            }

            if (_charController.isGrounded)
            {
                if (Vector3.Dot(movement, _contact.normal) < 0)
                {
                    movement = _contact.normal * moveSpeed;
                }
                else
                {
                    movement += _contact.normal * moveSpeed;
                }
            }
        }
        movement.y = _vertSpeed;

        movement *= Time.deltaTime;
        _charController.Move(movement);
    }

    void OnControllerColliderHit(ControllerColliderHit hit)
    {
        _contact = hit;
    }
}