c# - 如何在unity3d中制作测距仪

Question

我正在尝试制作测距仪。但我没有得到我想要的。所以我上传了一张照片。我想要弯曲的距离，但我正在变直，比如位移。

这是我的代码:

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class DistanceMeter : MonoBehaviour {

    public GameObject current;
    public GameObject destination;
    private float beginPos;
    private float targetPos;
    private float currPos;
    public Text dist;

    void Start()
    {
        beginPos = current.transform.position.x;
        targetPos = destination.transform.position.x;
    }

    void Update()
    {
        currPos = current.transform.position.x - targetPos;
        int Distance = Mathf.Abs(Mathf.RoundToInt (currPos));
        dist.text = Distance.ToString()+ " meters";
    }
}

Answer 1

您可以累加行驶距离以找出曲线上的行驶距离:

public class DistanceMeter : MonoBehaviour
{
    public GameObject current;
    public GameObject destination;
    private float beginPos;
    private float targetPos;
    private float currPos;
    private float displacement;
    public Text dist;

    void Start()
    {
        beginPos = current.transform.position.x;
        targetPos = destination.transform.position.x;
    }

    void Update()
    {
        float currDelta = current.transform.position.x - currPos;
        currPos = current.transform.position.x;
        displacement += Mathf.Abs(currDelta);
        dist.text = displacement.ToString() + " meters";
    }
}

但为了找出剩余距离(或尚未移动的位移)，您至少需要知道曲线的半径:

我假设曲线是圆的一部分

如果曲线是半个圆，位移是半径×pi

否则如果已知角度，则位移为半径×角度(弧度)

如果角度未知但半径和距离已知，则位移为2 × radius × arcsin(distance/2 × radius)