Raycasting not returning anything but nil

Help and Feedback Scripting Support
#1

Hi all,
I’ve recently encountered an issue while raycasting. I’m trying to create a realistic enemy detection range, and for that, I raycast a bunch of rays at a certain angle to see what they return. However, all rays return nil, despite there clearly being parts obstructing the rays. The script is located inside the default R6 dummy.

Here’s my code, and example pictures are provided below

local humanoid = script.Parent
local rootPart = script.Parent.PrimaryPart
local headPart = script.Parent.Head

local FOV = 135
local sight = 30

function randomWalk()
	
	local rayOrigin = script.Parent.Head.Position
	
	for i = 0, FOV do
		
		local rayDirection = Vector3.new(headPart.Orientation.X, headPart.Orientation.Y - FOV/2 + i + 90, headPart.Orientation.Z)
		local rayParameters = RaycastParams:new()
		
		local testPart = Instance.new("Part")
		testPart.Size = Vector3.new(100, 1, 1)
		testPart.Anchored = true
		testPart.Position = rayOrigin
		testPart.Orientation = rayDirection
		testPart.Parent = workspace
		
		rayParameters.FilterDescendantsInstances = {script.Parent}
		rayParameters.FilterType = Enum.RaycastFilterType.Exclude
		
		local raycastResult = workspace:Raycast(rayOrigin, rayDirection, rayParameters)
		
		if raycastResult ~= nil then
			print(raycastResult.Instance, rayDirection)
		else
			print(raycastResult)
		end
	end
end

randomWalk()

And here’s what happens when ran, along with the output console:

image
image1017×957 83 KB

image
image536×707 17.3 KB

I’ve also checked out multiple topics similar to this with no meaningful results, so any help with this issue would be massively appreciated. Thanks.

#2

The issue may be with rayDetection. the rayDirection is supposed to be a Vector3 value representing the direction and magnitude of the ray. but you’re setting the rayDirection to the orientation of the headPart.

local humanoid = script.Parent
local rootPart = script.Parent.PrimaryPart
local headPart = script.Parent.Head

local FOV = 135
local sight = 30

function randomWalk()
	
	local rayOrigin = script.Parent.Head.Position
	
	for i = 0, FOV do
		
		local angle = math.rad(i - FOV/2) 
		local rayDirection = CFrame.new(headPart.Position, headPart.Position + headPart.CFrame.LookVector) * CFrame.Angles(0, angle, 0) * Vector3.new(0, 0, -sight)
		
		local rayParameters = RaycastParams:new()
		
		local testPart = Instance.new("Part")
		testPart.Size = Vector3.new(100, 1, 1)
		testPart.Anchored = true
		testPart.Position = rayOrigin
		testPart.Orientation = rayDirection
		testPart.Parent = workspace
		
		rayParameters.FilterDescendantsInstances = {script.Parent}
		rayParameters.FilterType = Enum.RaycastFilterType.Exclude
		
		local raycastResult = workspace:Raycast(rayOrigin, rayDirection, rayParameters)
		
		if raycastResult ~= nil then
			print(raycastResult.Instance, rayDirection)
		else
			print(raycastResult)
		end
	end
end

randomWalk()

This new script i did rotates the LookVector of the headPart around the Y by the specified angle, and uses it to create a direction vector for the raycast.

#3

Is it because you are firing the ray.Direction along the testPart so that’s all it’s hitting.

A simple check would be to try placing the testPart.Position = rayOrigin and subtract 1 (or more) on the Y axis

#4

This is quite odd, but its hard to find an issue without testing.
From experience the main cause is the Direction used in the raycast.
CanQuery should be on for your parts