Unity 2D-光线没有朝着正确的方向前进

Question

我有一个游戏对象，它应该向多个方向发射光束。我想让它尽可能灵活，所以我添加了几个目标，脚本将在其中绘制一条射线（从游戏对象到目标）。我已经使用了目标变换的位置变量，但这只会导致所有光线都向一个奇怪的方向发射，但当我四处移动时，它确实发生了轻微的变化。然后我尝试了目标的局部位置，但这导致所有光线都沿其原始方向行进，而不考虑旋转的变化。

这是激光脚本的代码：

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

public class Laser : MonoBehaviour {
    private LineRenderer Linerenderer;
    public List<Transform> rays;

    void Start()
    {
        Physics2D.queriesStartInColliders = false;
    }
    void Update () {

        foreach (Transform tran in rays)
        {
            RaycastHit2D hit = Physics2D.Raycast(transform.position, tran.position,20);
            Debug.DrawLine(transform.position, hit.point);
        }
    }
}

截图：

-Using world positions:

-Using local positions:

Answer 1

Physics2D.Raycast() method's second parameter you are specifying is wrong: it should not be a position in space, but a direction. The second parameter for the Debug.DrawRay()方法也是一个方向，而不是space中的点。

尝试以下操作：

void Update () { foreach (Transform tran in rays) { Vector2 direction = (tran.position - transform.position).normalized; RaycastHit2D hit = Physics2D.Raycast(transform.position, direction, 20); Vector2 rayDirection = hit.point - transform.position; Debug.DrawRay(transform.position, rayDirection); } }

Answer 2

谢谢，经过一番折腾，我终于能够让它工作了。如果其他人需要类似的帮助（动态光线投射）。这是最终代码（您可能需要稍微编辑一下）：

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

public class Laser : MonoBehaviour {
    private LineRenderer Linerenderer;
    public List<Transform> rays;

    void Start()
    {
        Physics2D.queriesStartInColliders = false;

    }
    void Update()
    {

        foreach (Transform tran in rays)
        {
            Debug.DrawRay(new Vector3(1, 1, 0), new Vector3(-1, -1, 0));
            Vector2 direction = (tran.position - transform.position).normalized;
            RaycastHit2D hit = Physics2D.Raycast(transform.position, direction);
            Vector2 rayDirection = (hit.point - new Vector2( transform.position.x, transform.position.y));
            Debug.DrawRay(transform.position, rayDirection);
        }
    }
}

Unity 2D-光线没有朝着正确的方向前进

Unity 2D- Rays not going in the right direction

2d

unity3d

raycasting