NPC see check

[rute]

How to check if NPC can see it's enemy or if enemy see NPC?

[MilkWorm]

Give one of your npcs a weapon if the npc kills the other one it means it saw it.

[jrj996]

You can probably use a trace.

[Feihc]

Trace from the NPC's view to the target NPC

[rute]

[QUOTE=Feihc;29981693]Trace from the NPC's view to the target NPC[/QUOTE]

Like this?

local pos = self:GetPos()
local ang = (self.Enemy:GetPos() - self:GetPos()):Angle()
local tracedata = {}
tracedata.start = pos
tracedata.endpos = pos+(ang*5000)
tracedata.filter = self
local trace = util.TraceLine(tracedata)
if trace.HitNonWorld then
	target = trace.Entity
	if(target == self.Enemy) then
		print("TARGETED")
		self.Sees = 1
	else
		self.Sees = 0
	end
end	

It hardly work because TARGETED message pop-ups randomly.

EDIT2: solved by: tracedata.endpos = self.Enemy:GetPos()

[Loures]

Something like this should work
[lua]
function CanNPCSeeEntity(npc, target)
local dir = (target:GetPos() - npc:GetPos()):Normalize()
local tr = util.TraceLine({start = npc:GetPos(), endpos = npc:GetPos() + dir * 16384, filter = npc})
return dir:Dot(npc:GetAimVector()) >= 0.5 and tr.Entity == target
end
[/lua]