| ray | 定义要测试的原点和方向的 3D 射线。 |
| distance | 射线的最大投射距离。 |
| layerMask | 过滤器，用于仅在特定层上检测碰撞体。 |
RaycastHit2D 返回的投射数量。
向场景中的碰撞体投射 3D 射线，返回射线路径上的第一个碰撞体。
对于查找与任意 3D 射线相交的碰撞体来说，这很有用。
注意，该函数将为返回的 RaycastHit2D 对象分配内存。如果需要频繁进行此类调用，可以使用 GetRayIntersectionNonAlloc 来避免这种开销。
此外，该函数是一种 3D 交叉测试，因此 RaycastHit2D 中返回的任何碰撞法线都将为零。
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