C# 我该如何增加汽车的摩擦力，使其不会'；我不滑翔时不要滑翔'；你不给它任何信息吗？

各位。我是Unity 2D和C#的新手，我想知道，如果我的车滑得太厉害，我真的感觉不到我能控制住它，我怎么能在我不想让它滑的时候阻止它在我的比赛中不停地向前滑。我希望这样，如果我不给汽车任何输入，或给计数器输入，汽车几乎立即停止或开始向另一个方向移动。我曾尝试过创建Physics2D材质并增加摩擦力，但实际上对游戏没有任何影响。我也尝试过检查，如果没有玩家输入，rb.velocity设置为0，或者大约为当前的0.2，因此它是一个更平滑的停止，但只有当玩家移动然后放开移动键时才有效，而不是当他们尝试反向移动时。我也考虑过通过比较前一个位置和当前位置来检查汽车的行驶方向，然后在相反的方向上加力来停止汽车，但这似乎非常需要性能，我真的不知道从哪里开始。如果有人对我将如何做这件事有任何建议，请让我知道如何做。这是我目前掌握的代码：

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

public class CarController : MonoBehaviour
{

public Rigidbody2D carRigidbody;
public Rigidbody2D backTire;
public Rigidbody2D frontTire;

private float movement;
public float fspeed = 100;
public float bspeed = 60;
public float carTorque = 10;
public float decVel = .9f;
private bool beganMoving;



// Start is called before the first frame update
void Start()
{

}

// Update is called once per frame
void Update()
{
    movement = Input.GetAxis("Horizontal");
}

void FixedUpdate() {
    if (movement == 1 || movement == -1) {
        beganMoving = true;
    }
    if (movement == 0 && beganMoving) {
        backTire.velocity = new Vector2 (backTire.velocity.x * decVel * Time.fixedDeltaTime, backTire.velocity.y); 
        frontTire.velocity = new Vector2 (backTire.velocity.x * decVel * Time.fixedDeltaTime, backTire.velocity.y);
        
    }
    
    
    backTire.AddTorque(-movement * bspeed * Time.fixedDeltaTime);
    frontTire.AddTorque(-movement * fspeed * Time.fixedDeltaTime);
    carRigidbody.AddTorque(-movement * carTorque * Time.fixedDeltaTime);
}

}

使用System.Collections；
使用System.Collections.Generic；
使用UnityEngine；
公共类CarController：单行为
{
公共刚体；
公共刚体2D后轮胎；
公共刚体2D前轮胎；
私人浮动运动；
公共浮点数fspeed=100；
公共浮点数=60；
公共浮动卡通克=10；
公共浮动下降=0.9f；
私人住宅开始搬家；
//每帧调用一次更新
无效更新（）
{
移动=输入。GetAxis（“水平”）；
}
void FixedUpdate（）{
如果（移动==1 | |移动==-1）{
beganMoving=true；
}
if（movementHi每个人都浏览过类似的问题。我最终解决这个问题的方法是在这里实现这整段代码：

isGrounded = Physics2D.OverlapCircle(groundCheck.position, checkRadius, whatIsGround);

    if (movement == 1 || movement == -1) {
        beganMoving = true;
    } // this makes sure we've started moving which will be used later
    if (movement == 0 && isGrounded) {
        backTire.velocity = new Vector2 (backTire.velocity.x * .8f * Time.fixedDeltaTime, backTire.velocity.y); 
        frontTire.velocity = new Vector2 (frontTire.velocity.x * .8f * Time.fixedDeltaTime, frontTire.velocity.y);  // this whole if statement is so that our car will stop or decelerate when no input is given to it as to stop  it from rolling all across the ground
    }
    if (movement > 0 && prevMove < 0) { // checks if we are moving forward (right) when we used to move backwards (left)
        backTire.velocity = new Vector2 (backTire.velocity.x * decVel * Time.fixedDeltaTime, backTire.velocity.y); 
        frontTire.velocity = new Vector2 (frontTire.velocity.x * decVel * Time.fixedDeltaTime, frontTire.velocity.y); //stops us if the if statement returns true
        prevMove = 1; // sets our previous movement to moving forward to make it not repeat itself and to check with later on
    } else if (movement < 0 && prevMove > 0 ) { // checks if we are moving backwards when we used to be moving forwards
        backTire.velocity = new Vector2 (backTire.velocity.x * decVel * Time.fixedDeltaTime, backTire.velocity.y); 
        frontTire.velocity = new Vector2 (frontTire.velocity.x * decVel * Time.fixedDeltaTime, frontTire.velocity.y); //stops car
        prevMove = -1; // sets previous movement to moving backwards
    } else {
        if (beganMoving == true) { // when we start moving we set the previous movement to which ever direction we decided to first move in
        prevMove = movement;
        beganMoving = false; // set began moving to false. This doesn't make sense logically since we did begin moving but it's so this if statement doesn't repeat itself again
        }
    }

isground=Physics2D.overlapple圆（groundCheck.position，checkRadius，whatIsGround）；
如果（移动==1 | |移动==-1）{
beganMoving=true；
}//这确保我们已开始移动，稍后将使用
如果（移动==0&&isGrounded）{
backTire.velocity=新矢量2（backTire.velocity.x*.8f*时间固定时间，backTire.velocity.y）；
frontTire.velocity=new Vector2（frontTire.velocity.x*.8f*Time.fixeddeltime，frontTire.velocity.y）；//这个完整的if语句是这样的：当没有输入时，我们的汽车将停止或减速，以阻止它在地面上滚动
}
if（movement>0&&prevMove<0）{//检查我们过去向后移动（左）时是否向前移动（右）
backTire.velocity=新矢量2（backTire.velocity.x*devel*Time.fixeddedtime，backTire.velocity.y）；
frontTire.velocity=newvector2（frontTire.velocity.x*devel*Time.fixeddeltime，frontTire.velocity.y）；//如果if语句返回true，则停止我们
prevMove=1；//将上一个移动设置为向前移动，使其不会重复，并在稍后进行检查
}else if（movement<0&&prevMove>0）{//检查我们过去向前移动时是否向后移动
backTire.velocity=新矢量2（backTire.velocity.x*devel*Time.fixeddedtime，backTire.velocity.y）；
frontTire.velocity=new Vector2（frontTire.velocity.x*devel*Time.fixedDeltaTime，frontTire.velocity.y）；//停车
prevMove=-1；//将上一个移动设置为向后移动
}否则{
如果（beganMoving==true）{//当我们开始移动时，我们设置了我们决定首先移动的上一个移动方向
移动=移动；
beganMoving=false；//set开始移动到false。这在逻辑上没有意义，因为我们确实开始移动了，但如果语句不再重复，它就是这样
}
}

我加入了一些评论，希望您能够理解我做了什么以及为什么这么做。我希望这对任何有类似问题的人都有帮助。
我遇到了一些错误，即“CircleCollider2D”不包含“material”的定义，并且statFriction和dynFriction在当前上下文中不存在。是否需要为stat和dynFr定义一些变量iction？我需要写物理材料2D而不是材料吗？@HectorAstrom抱歉，我现在正在编辑它。（我的回答好像coll是一个
碰撞器，而不是
环形碰撞器2D
）是的，我基本上只是假设，对撞机对我的轮子来说意味着cirlce collider 2d，但这是一个错误的假设，我应该使用通用对撞机吗？圆形对撞机2d就是我上面描述的错误。我看到你编辑了你的原始帖子。这是我想设置物理材料的方式，但增加了唱车轮上的摩擦似乎没有任何作用。我知道材质的应用是正确的，就像我在游戏中更改弹跳度一样。但如果我更改摩擦，则不会更新，或者至少它不明显。@HectorAstrom我认为这是因为您的代码与对撞机的设置没有任何关系。
isGrounded = Physics2D.OverlapCircle(groundCheck.position, checkRadius, whatIsGround);

    if (movement == 1 || movement == -1) {
        beganMoving = true;
    } // this makes sure we've started moving which will be used later
    if (movement == 0 && isGrounded) {
        backTire.velocity = new Vector2 (backTire.velocity.x * .8f * Time.fixedDeltaTime, backTire.velocity.y); 
        frontTire.velocity = new Vector2 (frontTire.velocity.x * .8f * Time.fixedDeltaTime, frontTire.velocity.y);  // this whole if statement is so that our car will stop or decelerate when no input is given to it as to stop  it from rolling all across the ground
    }
    if (movement > 0 && prevMove < 0) { // checks if we are moving forward (right) when we used to move backwards (left)
        backTire.velocity = new Vector2 (backTire.velocity.x * decVel * Time.fixedDeltaTime, backTire.velocity.y); 
        frontTire.velocity = new Vector2 (frontTire.velocity.x * decVel * Time.fixedDeltaTime, frontTire.velocity.y); //stops us if the if statement returns true
        prevMove = 1; // sets our previous movement to moving forward to make it not repeat itself and to check with later on
    } else if (movement < 0 && prevMove > 0 ) { // checks if we are moving backwards when we used to be moving forwards
        backTire.velocity = new Vector2 (backTire.velocity.x * decVel * Time.fixedDeltaTime, backTire.velocity.y); 
        frontTire.velocity = new Vector2 (frontTire.velocity.x * decVel * Time.fixedDeltaTime, frontTire.velocity.y); //stops car
        prevMove = -1; // sets previous movement to moving backwards
    } else {
        if (beganMoving == true) { // when we start moving we set the previous movement to which ever direction we decided to first move in
        prevMove = movement;
        beganMoving = false; // set began moving to false. This doesn't make sense logically since we did begin moving but it's so this if statement doesn't repeat itself again
        }
    }