Raycast no longer hits non-collide parts?

Help and Feedback Scripting Support
1

Hello, I’m currently scripting a room detection, and when I stand on a RoomHitbox, it prints correctly. However, as soon as I make it non-collide, it returns nil. Is there a property which disables non-collide parts?

raycastParams.FilterType = Enum.RaycastFilterType.Whitelist
raycastParams.FilterDescendantsInstances = {workspace.RoomParts}
local raycastResult = workspace:Raycast(player.Character.HumanoidRootPart.Position, Vector3.new(0,-3,0), raycastParams)
print(raycastResult)

this is on a local script, and fires using a loop just for testing. It always prints nil when the part is non-collide(it’s still anchored).

1 Like
2

I thought that rays can hit non-collide parts but I might be incorrect. One thing you can do to make the part non-collide (but not really) is making a new collision group. Then just set the ray to only hit parts in the collision group with this property: RaycastParams.CollisionGroup. Then set the new collision group to not be able to collide with the default collision group.

If you are looking to not hit non-collide parts you can use recursion, which is where you recall a function inside that function. If you want more info about that just ask me.

1 Like
3

The weird thing is, that doesn’t even work! I’m also positive that rays hit non-collide, but right now even doing a separate CollisionGroup doesn’t work. I’m definitely doing something wrong?

local player = game.Players.LocalPlayer
local Part = script.Part:Clone()
local PhysicsService = game:GetService("PhysicsService")
PhysicsService:SetPartCollisionGroup(Part,"RoomParts")
Part.Parent = workspace 
while wait() do
	if player.Character and player.Character:FindFirstChild("HumanoidRootPart") then
		Part.Position = player.Character.HumanoidRootPart.Position + Vector3.new(0,100,0)
		local part = player.Character:FindFirstChild("HumanoidRootPart")
		local raycastParams = RaycastParams.new()
		raycastParams.FilterType = Enum.RaycastFilterType.Whitelist
		raycastParams.FilterDescendantsInstances = {workspace.RoomParts}
		raycastParams.CollisionGroup = "RoomParts"
		local raycastResult = workspace:Raycast(part.Position, Vector3.new(0,-3,0), raycastParams)
		print(raycastResult)
		if raycastResult  then
		-- it is indoors my dudes
			for i,v in pairs(Part:GetChildren())do
				v:Clear()
				v.Enabled = false
			end
		else
		--it is outdoors my dudes

			for i,v in pairs(Part:GetChildren())do
				v.Enabled = true
			end
		end
	end
end

Edit:I was editting the wrong part’s collision group, let me try it again
Edit2:Still doesnt work, is my studio just bugged?

1 Like
4 
--Local script
local player = game.Players.LocalPlayer
--I assume part is like a rain cloud or something
local Part = script.Part:Clone()
local PhysicsService = game:GetService("PhysicsService")
--Unless part is what you want your raycast to hit, change this to a for each in RoomParts
PhysicsService:SetPartCollisionGroup(Part,"RoomParts")
Part.Parent = workspace
while wait() do
	if player.Character and player.Character:FindFirstChild("HumanoidRootPart") then
		Part.Position = player.Character.HumanoidRootPart.Position + Vector3.new(0,100,0)
        --I recomend naming things useful names. It's a good habit.
		local part = player.Character:FindFirstChild("HumanoidRootPart")
		local raycastParams = RaycastParams.new()
        --[[
        If you set up the collision groups correctly there will not be a need for
        a filter. But because that wasn't the problem, I would leave this and
        not use the collision group stuff.
        ]]
        
		raycastParams.FilterType = Enum.RaycastFilterType.Whitelist
		raycastParams.FilterDescendantsInstances = {workspace.RoomParts}
		raycastParams.CollisionGroup = "RoomParts"
        --[[
        The raycast's range is only three studs downwards from the player's
        hrp, which is 3 studs above the ground. That will probably cause a
        problem.
        ]]--
		local raycastResult = workspace:Raycast(part.Position, Vector3.new(0,-3,0), raycastParams)
		print(raycastResult)
		if raycastResult  then
		-- it is indoors my dudes
			for i,v in pairs(Part:GetChildren())do
				v:Clear()
				v.Enabled = false
			end
		else
		--it is outdoors my dudes

			for i,v in pairs(Part:GetChildren())do
				v.Enabled = true
			end
		end
	end
end

Possible Solutions

  • Increase range by 1 or 2
  • The ray starts inside the part you’re trying to hit, move the origin up a bit.
1 Like
5

Oh does it not work if it starts inside the part? the part covers the whole room, so that could be it.

6

Sorry to butt in here like this.

Butt, can you use just a normal Vector3 as the second parameter? I thought it had to be relative or something.
Like part.Position + Vector3.new(0,-3,0)

So:
workspace:Raycast(part.Position, part.Position + Vector3.new(0,-3,0), raycastParams)

I mean might as well worth a try, unless I’m wrong, or you can use it both ways.

7

I don’t think so, the second parameter is just the direction and how far it has to go.
like Vector3.new(0,5,0) will go up 5 studs, and part.CFrame.LookVector*500 will be 500 in the face of the part.