| ray | 定义原点和测试方向的 3D 射线。 |
| distance | 投射射线的最大距离。 |
| layerMask | 用于选择要检测碰撞器的图层的图层蒙版过滤器。 |
RaycastHit2D[] 射线相交结果。
对场景中的 2D 碰撞器投射 3D 射线。
此函数充当 3D“射线投射”，但专门设计用于检测 2D 碰撞器。它通过将 3D 射线投影到 2D 空间中，然后执行 2D 相交测试来实现此目的，并根据原始 3D 射线的 Z 方向对结果进行排序。
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