Question

我正在制作一个游戏，其中一个物体主要是飞行，我想要一些帮助，因为我有一个向前的速度，当精灵落到地面时它会继续car然而其余的代码仍然很好

using UnityEngine;
using System.Collections;

public class BirdMovment : MonoBehaviour {

    Vector3 Velocity = Vector3.zero;
    public Vector3 gravity;
    public Vector3 flapVelocity;
    public float maxSpeed = 5f; 
    public float forwardSpeed = 1f;

    bool didFlap = false;

    Animator animator;

    // Use this for initialization
    void Start () {

        animator = GetComponent<Animator> ();

    }

    void Update (){
        if (Input.GetKeyDown (KeyCode.Space) || Input.GetMouseButtonDown(0)) 
        {
            didFlap = true; 
        }
    }

    // Physics update goes here
    void FixedUpdate () {
        Velocity.x = forwardSpeed;
        Velocity += gravity * Time.deltaTime;

        if (didFlap) {

            animator.SetTrigger("DoFlap");

            didFlap = false;
            if(Velocity.y < 0)
                Velocity.y = 0;

            Velocity += flapVelocity;
            }

        Velocity = Vector3.ClampMagnitude (Velocity, maxSpeed);

        transform.position += Velocity * Time.deltaTime;

        float angle = 0;
        if(Velocity.y < 0)
        {
            angle = Mathf.Lerp(0 , -45 ,-Velocity.y / maxSpeed);
        }
        transform.rotation = Quaternion.Euler(0,0,angle);

    }
}

你能告诉我应该放置代码的位置，以便在我的物体撞击地面时使前进速度停止

Answer 1

有两种快速的方法可以让我想到这一点。

第一种方法是向对象添加多个状态以更改其在更新循环期间的操作。例如，如果对象要击中地面，您可以将状态设置为“空闲”（或者您想要调用的任何内容）。根据状态，更新循环将调用特定函数来更新对象速度。在状态为空闲的情况下，更新功能可以简单地将对象速度设置为零。

另一种方法是在碰撞地面时简单地将前进速度设置为零。这不一定是最好的方式，但也是一种选择。

Answer 2

所以，基本上，我认为最简单的方法是添加一个Rigidbody2D（我假设您在制作一个2D游戏）并让物理引擎为我们完成大部分工作。你还需要添加某种2D对撞机，以防你的鸟在第一时间没有。我已经修改了你的脚本以使用物理引擎，而不是直接操作变换位置，尝试并告诉我它是否有效：）

using UnityEngine;
using System.Collections;

// Added this to make sure that you'll not forget to add a rigidbody and a collider to your game object
[RequireComponent(typeof(Rigidbody2D), typeof(CircleCollider2D))]
public class BirdMovment : MonoBehaviour 
{
    // I've changed it to Vector2, so it would be more comfortable to use with 2D physics
    public Vector2 flapVelocity;
    public float maxSpeed = 5f; 
    public float forwardSpeed = 1f;

    bool didFlap = false;

    Animator animator;
    // I'm assuming here that your game is 2D and used 2D physics.
    // If not - just switch to the regular Rigidbody, only a few modifications will be needed, if at all
    Rigidbody2D myRigidbody;

    // Here we will store the velocity achieved by flapping
    // It's calculating separately from the overall velocity and forwardSpeed for simplicity
    Vector2 userVelocity = Vector2.zero;

    // Use this for initialization
    void Start () {

        animator = GetComponent<Animator> ();
        myRigidbody = rigidbody2D;

    }

    void Update (){
        if (Input.GetKeyDown (KeyCode.Space) || Input.GetMouseButtonDown(0)) 
        {
            didFlap = true; 
        }
    }

    // Physics update goes here
    void FixedUpdate () {

        // We do not need to apply gravity, as the rigidbody does it for us (and it's doing so in more realistic form that can simply be achieved)
        //Velocity += gravity * Time.deltaTime;

        // This is needed because you wan't to reset birds velocity on a flap, but at the same time want to retain realistic falling due to the gravity
        userVelocity.y = myRigidbody.velocity.y;

        if (didFlap) {

            animator.SetTrigger("DoFlap");

            didFlap = false;
            // Here we use user velocity instead of directly applying to rigidbody's velocity to simplify everything a little bit
            if (userVelocity.y < 0)
                userVelocity.y = 0;

            userVelocity += flapVelocity;
            }

        userVelocity = Vector2.ClampMagnitude(userVelocity, maxSpeed);

        // If we will directly change our transform avoiding the physics engine, everything will brake, so we don't want to do that :)
        //transform.position += Velocity * Time.deltaTime;

        // Instead we are setting the velocity of our rigidbody, so the physics engine will make all work for us
        myRigidbody.velocity = userVelocity;

        // Adding a forwardSpeed to our velocity
        myRigidbody.velocity = new Vector2(forwardSpeed, myRigidbody.velocity.y);

        // This part is mostly intact, only we're now using our rigidbody's velocity for calculations
        float angle = 0;
        if(myRigidbody.velocity.y < 0)
        {
            angle = Mathf.Lerp(0, -45, -myRigidbody.velocity.y / maxSpeed);
        }
        transform.rotation = Quaternion.Euler(0,0,angle);

    }
}

如何在与一个物体碰撞时使精灵停止

2 个答案: