Detect if part is on a specific terrain material

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#1

Hello;

I am working on car, and the map consists of Smooth Terrain.

So I want to add dirt trails behind the wheels whenever driving on Terrain Grass, Mud etc.

How would I go about it; To clarify I already fixed the trails I just need to know when to enable and disable the trails.

The current script I got:

game["Run Service"].Heartbeat:Connect(function()
	if script.Parent.Parent.Parent.Stats.Engine.Value == false then return end
	local ray = Ray.new(script.Parent.Position,(script.Parent.Position - Vector3.new(0,-1,0)).unit * 3.5)
	
	local new = Instance.new("Part", workspace.Terrain)
	
	new.Material = Enum.Material.Neon
	new.Anchored = true
	new.CanCollide = false
	
	local _, pos, _, Material = workspace:FindPartOnRayWithIgnoreList(ray, {new, script.Parent, script.Parent.Parent.Holder, script.Parent.Parent.Axel, script.Parent.Parent.Parent.Engine})
	local distance = (script.Parent.CFrame.Position - pos).magnitude
	new.Size = Vector3.new(.1,.2,distance)
	new.CFrame = CFrame.new(script.Parent.CFrame.Position, pos) * CFrame.new(0, -distance, 0)
	print(Material)
	
	if Material == Enum.Material.Grass or Material == Enum.Material.Mud or Material == Enum.Material.LeafyGrass or Material == Enum.Material.Ground then
		script.Parent.Trail.Enabled = true
	else
		script.Parent.Trail.Enabled = false
	end
	
	game:GetService("Debris"):AddItem(new, 3)
end)

image
The trail is attached to the 2 Trail Attachments.

Right now the script just outputs the Air Material.

I have tried to change the Vector3 offset to different values but it still dosen’t work.
(On line 3)

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#2

This is actually translating the vector upwards, since a negative number subtracted to a negative number = positive, which would add the values together. It should be:

script.Parent.Position - Vector3.new(0, 1, 0)
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