跌落并重生

本课属于 Coddy Unity 学习旅程的“打造真正的游戏”单元。第 52 课，共 60 课。

挑战

中等

掉落后，玩家应该回到原处。

在 Player 中，添加 [SerializeField] private float fallY = -5f; 和一个重生点，并在 Start() 中将其设为起始位置。
添加 public void SetCheckpoint(Vector3 point)，用于设置重生点。
当位置低于 fallY 时：设置 controller.enabled = false，移动到重生点，再次启用控制器并清空 velocity。

按下 Play 并跳下去：你会回到垫子上。然后点击“检查”。

亲手试试

using UnityEngine;
using UnityEngine.InputSystem;

public class Player : MonoBehaviour
{
    [SerializeField] private float speed = 5f;
    [SerializeField] private float jumpHeight = 1.5f;
    [SerializeField] private float gravity = -9.81f;

    private CharacterController controller;
    private InputAction moveAction;
    private InputAction jumpAction;
    private Vector3 velocity;
    private MovingPlatform platform;

    void Start()
    {
        controller = GetComponent<CharacterController>();
        moveAction = InputSystem.actions.FindAction("Move");
        jumpAction = InputSystem.actions.FindAction("Jump");
    }

    void Update()
    {
        if (controller.isGrounded && velocity.y < 0f)
        {
            velocity.y = -2f;
        }

        Vector2 input = moveAction.ReadValue<Vector2>();
        Vector3 move = new Vector3(input.x, 0f, input.y) * speed;

        if (jumpAction.WasPressedThisFrame() && controller.isGrounded)
        {
            velocity.y = Mathf.Sqrt(jumpHeight * -2f * gravity);
        }

        velocity.y += gravity * Time.deltaTime;
        Vector3 motion = (move + velocity) * Time.deltaTime;
        if (platform != null)
        {
            motion += platform.delta;
            platform = null;
        }
        controller.Move(motion);
    }

    void OnControllerColliderHit(ControllerColliderHit hit)
    {
        if (hit.normal.y > 0.5f && hit.gameObject.TryGetComponent(out MovingPlatform moving))
        {
            platform = moving;
        }
    }
}