I am curently working on a stealth mechanic, but I'm unsure about something very important. I've set up a Neutral ai_relationship for the patroling NPC, and have parented a trigger_once to an npc_combine_s (the NPC) that acts as its Line-of-sight, and when the player "touches" it, the Relationship gets set to Hate. Also I've added trigger_multiple's as Safe zones, scattered in dark spots around the level, and had them Disable the NPC's Line-of-sight when the player is in them, and Enable it when the player exits them, but do you know if I can have the engine detect if the player is behind a wall, out of line-of-sight? As the title suggests - can I have the NPC's Line-of-sight, the parented trigger_once, check if it "touches" an info_target that's parented to the player AND another info_target that would be behind a wall, and if so, Disable itself? Or is that totally not the way to go about that... i'm having a brain fog moment on this issue. Any suggestions would be helpful!