Hello! I’m trying to implement a system for detecting if a dummy can see a player. Originally I though of using raycasts but came to the realisation that to detect if a point given a CFrame and FOV would see a slight part of the player, that I’d have to use many many raycasts to get it right.
My question is, is there a way to detect if a point with a CFrame and FOV can detect if the part can be seen. even if its slightly obscured
Use the Dot product combined with raycasts. If the raycast hits the part and the dot product is within given range the position can be seen
No? If there is a wall between them and the dotProduct gets within a valid range the result will be that the NPC can “See” the player even tho in that case the wall should completley block all vision
Raycast at the Center of Mass, if doesn’t see the player, try the edge of the player’s bounding box (locations shown as red dots).
Of course, if you really want to be precise, you can raycast the corner of each body part instead but this will increase the raycast maxumum by a lot so I don’t recommend unless it’s really important.
False positive edge case. The program will see the player when it shouldn’t.
Edit: I realized you specified parts, for normal blocks, this method works very well. For balls, mesh, and or cylinders, you may get the false positive edge cases.
Maybe instead of doing a “box” there I raycast to each and every corner maybe I can raycast at some important corners that shape the player. In the worst case scenario that would mean 48 raycasts at max, but given the structure of the Roblox character I could reduce that to be 28 raycasts!
Maybe that’s a dumb idea, it would almost eliminate false positive signs! I’ll get to working on making the system, thanks for the idea 
And that worked really well! Thank you so much for the idea, I really appreciate it!
In case anyone is curios on how I coded this, here’s the answer
local LimbSize = {
Head = Character:WaitForChild("Head").Size*.5,
LowerTorso = Character:WaitForChild("LowerTorso").Size*.5,
UpperTorso = Character:WaitForChild("UpperTorso").Size*.5,
RightUpperArm = Character:WaitForChild("RightUpperArm").Size*.5,
RightHand = Character:WaitForChild("RightHand").Size*.5,
LeftUpperArm = Character:WaitForChild("LeftUpperArm").Size*.5,
LeftHand = Character:WaitForChild("LeftHand").Size*.5,
RightUpperLeg = Character:WaitForChild("RightUpperLeg").Size*.5,
RightFoot = Character:WaitForChild("RightFoot").Size*.5,
LeftUpperLeg = Character:WaitForChild("LeftUpperLeg").Size*.5,
LeftFoot = Character:WaitForChild("LeftFoot").Size*.5
}
local OffsetCFrames = { -- Offset from some body part
-- Base Check
Character:WaitForChild("UpperTorso").CFrame,
-- Torso
Character:WaitForChild("UpperTorso").CFrame * CFrame.new(LimbSize.UpperTorso),
Character:WaitForChild("UpperTorso").CFrame * CFrame.new(LimbSize.UpperTorso * Vector3.new(-1,1,1)),
Character:WaitForChild("UpperTorso").CFrame * CFrame.new(LimbSize.UpperTorso * Vector3.new(-1,1,-1)),
Character:WaitForChild("UpperTorso").CFrame * CFrame.new(LimbSize.UpperTorso * Vector3.new(1,1,-1)),
Character:WaitForChild("LowerTorso").CFrame * CFrame.new(LimbSize.LowerTorso * Vector3.new(1,-1,1)),
Character:WaitForChild("LowerTorso").CFrame * CFrame.new(-LimbSize.LowerTorso * Vector3.new(-1,-1,1)),
Character:WaitForChild("LowerTorso").CFrame * CFrame.new(-LimbSize.LowerTorso),
Character:WaitForChild("LowerTorso").CFrame * CFrame.new(LimbSize.LowerTorso * Vector3.new(1,-1,-1)),
-- Head
Character:WaitForChild("Head").CFrame * CFrame.new(LimbSize.Head),
Character:WaitForChild("Head").CFrame * CFrame.new(LimbSize.Head * Vector3.new(-1,1,1)),
Character:WaitForChild("Head").CFrame * CFrame.new(LimbSize.Head * Vector3.new(-1,1,-1)),
Character:WaitForChild("Head").CFrame * CFrame.new(LimbSize.Head * Vector3.new(1,1,-1)),
-- RightArm
Character:WaitForChild("RightUpperArm").CFrame * CFrame.new(LimbSize.RightUpperArm),
Character:WaitForChild("RightUpperArm").CFrame * CFrame.new(LimbSize.RightUpperArm * Vector3.new(1,1,-1)),
Character:WaitForChild("RightHand").CFrame * CFrame.new(LimbSize.RightHand * Vector3.new(1,-1,1)),
Character:WaitForChild("RightHand").CFrame * CFrame.new(LimbSize.RightHand * Vector3.new(1,-1,-1)),
-- LeftArm
Character:WaitForChild("LeftUpperArm").CFrame * CFrame.new(LimbSize.LeftUpperArm * Vector3.new(-1,1,1)),
Character:WaitForChild("LeftUpperArm").CFrame * CFrame.new(LimbSize.LeftUpperArm * Vector3.new(-1,1,-1)),
Character:WaitForChild("LeftHand").CFrame * CFrame.new(LimbSize.LeftHand * Vector3.new(-1,-1,1)),
Character:WaitForChild("LeftHand").CFrame * CFrame.new(-LimbSize.LeftHand),
Character:WaitForChild("RightFoot").CFrame * CFrame.new(LimbSize.RightFoot * Vector3.new(1,-1,1)),
Character:WaitForChild("RightFoot").CFrame * CFrame.new(LimbSize.RightFoot * Vector3.new(1,-1,-1)),
Character:WaitForChild("LeftFoot").CFrame * CFrame.new(LimbSize.LeftFoot * Vector3.new(-1,-1,1)),
Character:WaitForChild("LeftFoot").CFrame * CFrame.new(-LimbSize.LeftFoot)
}
local RayParams = RaycastParams.new()
RayParams.FilterType = Enum.RaycastFilterType.Exclude
RayParams.IgnoreWater = true
RayParams.FilterDescendantsInstances = table.pack(table.unpack(Character:GetChildren()), table.unpack(Character:GetDescendants()))
local ray
for i = 1, #OffsetCFrames do -- testing if any raycasts work
ray = game.Workspace:Raycast(HeadCFrame.Position, (OffsetCFrames[i].Position - HeadCFrame.Position), RayParams)
if not ray then
break -- We can break early from the loop
end
end
if not ray then
print("Player Seen")
end
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