Unity Raycasting似乎不喜欢对角线

Question

我正在尝试使用光线投射来显示正确的光标，而不是观察敌人。我遇到了一些问题，因为它只是在直线上直接盯着敌人时才起作用，所以我检查了Debug.DrawRay，然后打开调试线，在我的块顶上看了一圈，然后关闭调试，找到这个奇怪的 -

看起来它并没有尝试在对角线上进行光线投射，这让我很困惑。

using UnityEngine;

public class CameraRaycaster : MonoBehaviour
{
    public Layer[] LayerPriorities = {
        Layer.Wall,
        Layer.Enemy,
        Layer.Walkable,

    };

    [SerializeField] 
    private float _distanceToBackground = 100f;

    [SerializeField] 
    private GameObject _raycastObject;

    public bool Debug = false;
    public Layer DebugLayer = Layer.RaycastEndStop;

    private Camera _viewCamera;

    private RaycastHit _hit;
    public RaycastHit Hit
    {
        get { return _hit; }
    }

    Layer _layerHit;
    public Layer LayerHit
    {
        get { return _layerHit; }
    }

    private void Start() // TODO Awake?
    {
        _viewCamera = Camera.main;
    }

    private void Update()
    {
        // Look for and return priority layer hit
        foreach (var layer in LayerPriorities)
        {
            var hit = RaycastForLayer(layer);
            if (hit.HasValue)
            {
                _hit = hit.Value;
                _layerHit = layer;
                return;
            }
        }

        // Otherwise return background hit
        _hit.distance = _distanceToBackground;
        _layerHit = Layer.RaycastEndStop;
    }

    private RaycastHit? RaycastForLayer(Layer layer)
    {
        var trans = this.transform;
        if (_raycastObject != null)
        {
            trans = _raycastObject.transform;
        }
        var layerMask = 1 << (int)layer; // See Unity docs for mask     formation
        //Ray ray = viewCamera.ScreenPointToRay(Input.mousePosition);

        RaycastHit hit; // used as an out parameter
        var hasHit = Physics.Raycast(trans.position, trans.forward, out hit,     _distanceToBackground,layerMask);
        if (Debug && (DebugLayer==Layer.RaycastEndStop ||     DebugLayer==layer))
        {
            var debugColour=hasHit?Color.green:Color.red;
            UnityEngine.Debug.DrawRay(trans.position,     trans.forward,debugColour,_distanceToBackground,true);
        }
        if (hasHit)
        {
            return hit;
        }
        return null;
    }
}