Unity移动平台跟随问题：玩家无法随移动平台同步移动

问题根源分析 #

1. 平台速度未乘以Time.deltaTime，导致移动量计算错误
2. OnTriggerStay的调用时机与玩家自身移动的Update执行顺序冲突，平台移动被覆盖
3. 依赖Rigidbody.velocity获取平台速度的方式兼容性差（不适用于直接修改Transform移动的平台）

解决方案及代码修改 #

1. 修改PlayerMovement脚本，添加平台速度叠加逻辑

新增平台速度变量，将其与玩家自身移动合并执行，避免移动指令被覆盖：

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

public class PlayerMovement : MonoBehaviour
{
    [SerializeField]
    private float walkSpeed = 4.0f;
    [SerializeField]
    private float jumpHeight = 2.0f;
    [SerializeField]
    private float gravity = -9.81f;
    [SerializeField]
    private float rotationSpeed = 5.0f;

    private CharacterController characterController;
    private PlayerInput playerInput;
    private Transform cameraTransform;

    private InputAction moveAction;
    private InputAction jumpAction;

    private Vector3 playerVelocity;
    private bool isGrounded;
    private Vector3 platformVelocity; // 新增：存储平台速度

    private void Awake()
    {
        characterController = GetComponent<CharacterController>();
        playerInput = GetComponent<PlayerInput>();

        cameraTransform = Camera.main.transform;

        moveAction = playerInput.actions["Walk"];
        jumpAction = playerInput.actions["Jump"];

        Cursor.lockState = CursorLockMode.Locked;
    }

    private void Update()
    {
        isGrounded = characterController.isGrounded;

        if (isGrounded && playerVelocity.y < 0)
        {
            playerVelocity.y = -5.0f;
            gravity = -9.81f;
        }

        Vector2 input = moveAction.ReadValue<Vector2>();

        Vector3 move = new Vector3(input.x, 0f, input.y);

        Vector3 cameraForwardDirection = new Vector3(Camera.main.transform.forward.x, 0, Camera.main.transform.forward.z);
        Vector3 cameraRightDirection = new Vector3(Camera.main.transform.right.x, 0, Camera.main.transform.right.z);

        move = cameraForwardDirection * move.z + cameraRightDirection * move.x;

        // 合并玩家移动与平台移动，统一执行
        characterController.Move((move * walkSpeed + platformVelocity) * Time.deltaTime);

        if (jumpAction.triggered && isGrounded)
        {
            playerVelocity.y += Mathf.Sqrt(jumpHeight * -3.0f * gravity);
        }

        playerVelocity.y += gravity * Time.deltaTime;

        characterController.Move(playerVelocity * Time.deltaTime);

        float targetAngle = cameraTransform.eulerAngles.y;
        Quaternion targetRotation = Quaternion.Euler(0, targetAngle, 0);
        transform.rotation = Quaternion.Lerp(transform.rotation, targetRotation, rotationSpeed * Time.deltaTime);

        // 每帧重置平台速度，避免持续叠加
        platformVelocity = Vector3.zero;
    }

    // 替换原PlatformMovement方法，改为设置平台速度
    public void SetPlatformVelocity(Vector3 velocity)
    {
        platformVelocity = velocity;
    }
}

2. 修改PlatformStick脚本，改用碰撞检测并兼容多种平台移动方式

放弃Trigger改用CollisionStay，通过帧位置差计算平台速度，兼容Rigidbody和Transform驱动的平台：

using UnityEngine;

public class PlatformStick : MonoBehaviour
{
    private Vector3 lastFramePosition;

    private void Start()
    {
        lastFramePosition = transform.position;
    }

    private void OnCollisionStay(Collision collision)
    {
        if (collision.gameObject.CompareTag("Player"))
        {
            PlayerMovement playerMovement = collision.gameObject.GetComponent<PlayerMovement>();
            if (playerMovement == null) return;

            // 计算平台当前帧的移动速度
            Vector3 positionDelta = transform.position - lastFramePosition;
            Vector3 platformSpeed = positionDelta / Time.deltaTime;

            playerMovement.SetPlatformVelocity(platformSpeed);
            lastFramePosition = transform.position;
        }
    }
}

关键配置说明 #

• 移动平台的Collider不要勾选Is Trigger，确保与玩家的CharacterController能触发碰撞检测
• 如果平台使用Rigidbody，需设置为Kinematic，避免被玩家推动同时保留移动能力

内容的提问来源于stack exchange，提问作者Siyun Cho