事件系统需要一种方法来检测当前输入事件需要发送到的位置,而此方法由射线投射器 (Raycaster) 提供。给定屏幕空间位置的情况下,射线投射器将收集所有潜在目标,确定它们是否在给定位置下,然后返回最接近屏幕的对象。提供了几种类型的射线投射器:
当场景中存在并启用了射线投射器时,只要从输入模块发出查询,事件系统就会使用该射线投射器。
如果使用多个射线投射器,那么这些射线投射器都会进行针对性投射,并且结果将根据与元素的距离进行排序。
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