unity3d 射线扫描 忽略图层

原地址：http://blog.csdn.net/w88193363/article/details/38331205

函数说明

static RaycastHit2D[] RaycastAll(Vector2 origin,Vector2 direction,float distance = Mathf.Infinity,int layerMask = DefaultRaycastLayers,float minDepth = -Mathf.Infinity,float maxDepth = Mathf.Infinity);

Parameters

origin	The point in 2D space where the ray originates.
direction	Vector representing the direction of the ray.
distance	Maximum distance over which to cast the ray.
layerMask	Filter to detect Colliders only on certain layers.
minDepth	Only include objects with a Z coordinate (depth) greater than this value.
maxDepth	Only include objects with a Z coordinate (depth) less than this value.

Description

Casts a ray against colliders in the scene, returning all colliders that contact with it.发射一条射线到场景中，检测射线射到的所有碰撞机(collider）

//layermask的参数表示，要忽略的图层，在编辑器中的元素属性为Sprite Renderer->Order in Layer
//把要忽略的物体设置为对应图层，然后再raycastall函数中的layermask定义为该图层，射线就会忽略该图层
RaycastHit2D[] rhArFirst = Physics2D.RaycastAll(qieObject.transform.position, vectorDir, StageManager.elementSize,3);