Question

我正在Unity 2D中创建游戏。我有要添加到场景中的Dragons。龙只应沿4个方向之一移动，即上，下，左和右。左右移动的龙完全按照预期移动。然而，上下移动的龙有一个问题，就是它们成一定角度移动。所有向上移动的龙都以45度角向上和向右移动。所有向下移动的龙都以45度角向下和向左移动。起初我以为动画师将龙移到另一个位置是一个问题，但是我从预制件上移除了动画师组件，问题仍然存在。

下面是我用来移动龙的代码。

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

public class DragonMovment : MonoBehaviour {
    public string Direction;    //needs to be set in the prefab

    public float DragonSpeed;   //speed of dragon

    Rigidbody2D rb; 

    public Transform Boundries;

    // Use this for initialization
    void Start ()
    {
        rb = GetComponent<Rigidbody2D>();
    }

    // Update is called once per frame
    void FixedUpdate ()
    {
        float MoveRight = 1;
        float MoveLeft = -1;
        float MoveUp = 1;
        float MoveDown = -1;

        if (Direction== "R")
        {
            rb.velocity = new Vector3(DragonSpeed * MoveRight, rb.velocity.y);
        }
        if (Direction == "L")
        {
            rb.velocity = new Vector3(DragonSpeed * MoveLeft, rb.velocity.y);
        }
        if (Direction == "U")
        {
            rb.velocity = new Vector3(DragonSpeed * MoveUp, rb.velocity.x);
        }
        if (Direction == "D")
        {
            rb.velocity = new Vector3(DragonSpeed * MoveDown, rb.velocity.x);
        }


    }
}

编辑。那为什么下面的工作呢？

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

public class PlayerControler : MonoBehaviour {
    // speed of movment 
    public float Speed;
    // rb
    Rigidbody2D rb;


    public Transform Boundries;

    // Use this for initialization
    void Start () {
        rb = GetComponent<Rigidbody2D>();
    }

    void FixedUpdate()
    {
        // get horizontal input
        float MoveSide = Input.GetAxis("Horizontal");
        //get vertical input
        float MoveVert = Input.GetAxis("Vertical");
        // move horizontal
        rb.velocity = new Vector3(Speed * MoveVert, rb.velocity.y);
        // move vertical 
        rb.velocity = new Vector3(Speed * MoveSide, rb.velocity.x);
    }
}

但是其他代码没有输入吗？

Answer 1

您已经在向量3的y中获得了速度x

if (Direction == "U")
{
    rb.velocity = new Vector3(rb.velocity.x, DragonSpeed * MoveUp);
}
if (Direction == "D")
{
    rb.velocity = new Vector3(rb.velocity.x, DragonSpeed * MoveDown);
}

当您覆盖后续语句中的值时，它可以在您的播放器脚本中使用。

    float MoveSide = Input.GetAxis("Horizontal"); //eg 1
    float MoveVert = Input.GetAxis("Vertical"); // eg 1

    // setting your x velocity incorrectly to the y (vert) velocity speed and keeping y the same velocity as start of frame
    rb.velocity = new Vector3(Speed * MoveVert, rb.velocity.y);
    // Set the y to the x value of the statement above so it is now in the correct vector and set the x to the correct hoz velocity
    rb.velocity = new Vector3(Speed * MoveSide, rb.velocity.x);

// effectively doing 
rb.velocity = new Vector3(Speed * MoveSide, Speed * MoveVert);

您还应该使用MovePosition，因为它不会直接影响物理引擎（使用速度可能对碰撞和触发器产生连锁反应，并产生意外的物理现象）。您的游戏对象必须标记为运动学对象，否则以下内容将导致它们立即传送到新位置。

var movementDirection = new Vector3(Speed * MoveSide, Speed * MoveVert);
rb.MovePosition(transform.position + movementDirection * Time.deltaTime);

* Time.deltaTime可以确保不同帧率下的移动保持一致。如果在30 fps的计算机上运行游戏，则游戏对象的移动速度将比60 fps慢。 Time.deltaTime计算自上一帧以来经过的物理时间，并确保无论帧速率如何，行进的距离都相同。

例如说gameObject每帧更新移动1。在30 fps的机器上旋转一秒后，该对象将移动30。在60 fps的机器上旋转一秒钟后，该对象将移动60。

Time.deltaTime=.2s on 30 fps so 1 movement * .2 = move .2 per frame * 30 frames in the second = 60 moved
Time.deltaTime=.1s on 60 fps so 1 movement * .1 = move .1 per frame * 60 frames in the second = 60 moved

统一2D中的方向实体运动故障

1 个答案: