为什么车轮怪异地转动，并从车上掉下来？

Question

我正在统一实施汽车控制器，这让我很头疼。有两个问题：

1. 前轮在播放模式下沿 z 轴旋转 90 度。

2. 轮子刚从车上掉下来。

这是汽车模型的层次结构：

在谷歌和 youtube 上搜索但没有找到任何相关内容。多次修改代码，结果都是一样的错误。请帮帮我。这是完整的代码：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class playerMovement : MonoBehaviour
{
  [SerializeField] WheelCollider leftFront;
  [SerializeField] WheelCollider rightFront;

  public Transform leftFrontWheelTransform;
  public Transform rightFrontWheelTransform;

  public GameObject player;
  public Transform toBeRolled;

  private float maxTurnAngle = 30f;
  private float currentTurnAngle = 30f;
    
  public static float currentSpeed;
  public static float DriveSpeed = 0.0f;
  public static float slowSpeed;
  public float steerAmount = 120f;
  private float steer;

  private float timer = 0f;
  private float SecondCount = 1f; //Delay time


    void Update()
      {
        slowSpeed = DriveSpeed * 0.7f; //slowSpeed = 5(initial) * 0.7 => 3.5 initially.
        currentSpeed = DriveSpeed;  //5
        if(Input.GetKey(KeyCode.Space))
        {
            currentSpeed = slowSpeed;
        }

        timer += Time.deltaTime;
        player.transform.position += player.transform.forward * (currentSpeed) * Time.deltaTime;

        float _horizontal = Input.GetAxis("Horizontal");
        steer += _horizontal * steerAmount * Time.deltaTime;

        float roll = Mathf.Lerp(0, 0, Mathf.Abs(_horizontal)) * -Mathf.Sign(_horizontal);
        float rollSTEAR = Mathf.Lerp(0, 10, Mathf.Abs(_horizontal)) * -Mathf.Sign(_horizontal);

        transform.localRotation = Quaternion.Euler(Vector3.up * steer + Vector3.forward * roll);
        toBeRolled.localRotation = Quaternion.Euler(Vector3.forward * rollSTEAR);

        currentTurnAngle = maxTurnAngle * _horizontal;
        leftFront.steerAngle = currentTurnAngle;    
        rightFront.steerAngle = currentTurnAngle;

        UpdateWheel(leftFront , leftFrontWheelTransform);
        UpdateWheel(rightFront , rightFrontWheelTransform);

         if(timer > SecondCount)
         {
             DriveSpeed += 0.00001f;
             //speed up text & sound on screen
             timer = 0f;
         }

     }
    
    void UpdateWheel(WheelCollider col, Transform trans)
    {
      Vector3 position;
      Quaternion rotation;

      col.GetWorldPose(out position, out rotation);

      trans.position = position;
      trans.rotation = rotation;

    }
}

Answer 1

Unity中的轮子应该设计成如下结构：

Car
  WheelCollider
    WheelMesh (Mesh Filter & Mesh Renderer)

不要移动或旋转具有 WheelCollider 的对象，移动或旋转子节点以达到视觉效果。