c# - 在某个x坐标Unity旋转头像

Question

我在将头像转向 map 上的某个位置时遇到问题。角色来回移动，但他不想在我输入的坐标处旋转。我究竟做错了什么？

这是我的代码:

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

public class AvatarPingPong : MonoBehaviour {

    // Use this for initialization
    public float speed;
    public float startXCord, endXCord;
    float endTrunx, startTurnx;

    public GameObject obj;
    Vector3 EndPoint, StartPoint;


    void Start () {
        EndPoint = transform.position;
        endXCord = EndPoint.x;
        endTrunx = EndPoint.x - 2f;

        StartPoint = transform.position;
        StartPoint.x = startXCord;
        startTurnx = StartPoint.x + 2f;
    }


    // Update is called once per frame
    void Update () {

        transform.position = new Vector3(PingPong (Time.time * speed, startXCord, endXCord ), transform.position.y, transform.position.z);

        if (transform.position.x == startTurnx ) {
            Debug.Log("start Check");
            obj.transform.Rotate(0f, 180f, 0f);
        }

        if (transform.position.x == endTrunx ) {
            obj.transform.Rotate(0f, 180f, 0f);
            Debug.Log("einde check");
        }

    }

    //function to change the default starting value of (0, 0, 0) to any value
    float PingPong(float t, float minLength, float maxLength) {
        return Mathf.PingPong(t, maxLength-minLength) + minLength;
    }   
}

Answer 1

我认为问题在于，一旦你的头像到达特定的 x 坐标，你就会尝试翻转他，但他可能永远不会到达那个确切的坐标。 if (transform.position.x == startTurnx) 仅当两个值完全相同时才会返回 true，并且您的头像实际上并未在屏幕上平滑移动。实际上他每帧都会跳跃几分钟，所以他可能永远不会准确地落在那个点上。

相反，我的建议是将他的新位置与旧位置进行比较，看看他正在朝哪个方向行驶，并在他改变方向时翻转他。一些代码:

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

public class AvatarPingPong : MonoBehaviour {

    // Use this for initialization
    public float speed;
    public float startXCord, endXCord;
    float endTrunx, startTurnx;

    public GameObject obj;
    Vector3 EndPoint, StartPoint;

    //I'm going to assume you start it moving left. You may have to change this
    bool goingLeft = false;


    void Start () {
        EndPoint = transform.position;
        endXCord = EndPoint.x;
        endTrunx = EndPoint.x - 2f;

        StartPoint = transform.position;
        StartPoint.x = startXCord;
        startTurnx = StartPoint.x + 2f;
    }


    // Update is called once per frame
    void Update () {
        float prevX = transform.position.x;
        float newX = PingPong (Time.time * speed, startXCord, endXCord );
        transform.position = new Vector3(newX, transform.position.y, transform.position.z);


        if (newX > prevX) {
            //avatar is moving to the right, check to see if that's the direction it was going last Update
            if (goingLeft) {
                Debug.Log("Flipping Right");
                obj.transform.Rotate(0f, 180f, 0f);
                goingLeft = false;
            }
        }else if (newX < prevX){
            //avatar is moving to the left, check to see it that's the direction it was going last Update
            if (!goingLeft) {
                Debug.Log("Flipping Left");
                obj.transform.Rotate(0f, 180f, 0f);
                goingLeft = true;
            }
        }

    }

    //function to change the default starting value of (0, 0, 0) to any value
    float PingPong(float t, float minLength, float maxLength) {
        return Mathf.PingPong(t, maxLength-minLength) + minLength;
    }   
}