Server side aimable beams

Help and Feedback Scripting Support
#1

I want a system where a beam will start at one point and end at your mouse position, basically an aimable beam. I also want a built-in ray casting feature where it checks for parts with CanCollide on in the way of the beam. No, I have not made an attempt at making this, I know I need help for this.

For reference and extra understanding of what I want, play Kaiju Universe and try a beam there. That’s what I want to make.

1 Like
#2

Rule number one in the roblox dev forum or any developping community forum is to never ask people to create things for you. People are only here to help.

So I will only help.
You need a local script to detect when the player activates the beam. Use a remote event and :FireServer sending mouse position.
In the server script, with that same remote event .OnClientEvent use roblox’s raycast system, and raycast from the Player to MousePosition.
I hope that you will be able to continue from here.

#3

Please dont ask for completed script as its against the first rule of devforum, i will instead provide with example code that you can expand and tweak yourself.

First we will need to make a Local Script, the reason being that we need to read players Mouse.Hit parameter to be able to point the beam. Inside that script we will only register a Mouse.Button1Down Event, then read Mouse.Hit and pass it to a remote event which is connected with to a Server Script which then will handle the raycasting and all logic.

LOCAL SCRIPT

local RunServcie = game:GetService("RunService")

local Player = game:GetService("Players").LocalPlayer
local Mouse = Player:GetMouse()

local RemoteEvent = game:GetService('ReplicatedStorage').UnreliableRemoteEvent

-- Send Remote event when mouse is pressed or released
local connection
Mouse.Button1Down:Connect(function()
	connection = RunServcie.Heartbeat:Connect(function()
		RemoteEvent:FireServer(Mouse.Hit.Position)
	end)
end)

Mouse.Button1Up:Connect(function()
	connection:Disconnect()
end)

Now its time for SERVER SCRIPT

local RemoteEvent = game:GetService('ReplicatedStorage'):FindFirstChild("UnreliableRemoteEvent")
local RunService = game:GetService("RunService")
local DebrisService = game:GetService("Debris")

RemoteEvent.OnServerEvent:Connect(function(Player,Mouse)
	local HumanoidRootPart = Player.Character:FindFirstChild("HumanoidRootPart")
		
	local rayOrigin = HumanoidRootPart.Position
	local Direction = HumanoidRootPart.Position - Mouse
	local RaycastResult = simpleRaycast(rayOrigin,Direction)
	local Intersection = RaycastResult and RaycastResult.Position or rayOrigin + Direction
	if RaycastResult ~= nil then -- to make sure we dont get errors when shooting at sky
-- Visuals		
local Beam = Instance.new("Part") 
		Beam.Shape = Enum.PartType.Block
		Beam.Transparency = 0.8
		Beam.Color = Color3.new(0.780392, 0.117647, 1)
		Beam.Material = Enum.Material.Neon
		Beam.Anchored = true
		Beam.CanCollide = false
		Beam.CFrame = CFrame.new(rayOrigin,Intersection) * CFrame.new(0,0,-RaycastResult.Distance/2) --Offset our beam by half of the raycast distance
		Beam.Size = Vector3.new(1,1,RaycastResult.Distance) -- Set beams size as length of our Raycast
		DebrisService:AddItem(Beam,0.05)
		Beam.Parent = workspace
	end			
end)

function simpleRaycast(rayOrigin,rayDirection)
	local rayParams = RaycastParams.new()
	rayParams.FilterType = Enum.RaycastFilterType.Exclude
	rayParams.RespectCanCollide = true
	rayParams.FilterDescendantsInstances = {} -- Put here things you want to be ignored by our raycast
	local RaycastResult = workspace:Raycast(rayOrigin,rayDirection,rayParams)

	return RaycastResult
end

I used a newly added UnreliableRemoteEvent instead of a normal remote event as we need to keep sending players mouse position to server.

#4

ExapmleBeam.rbxl (55.3 KB)
Also here is the example so you can see how it works and play around with it. if you got any questions feel free to ask. :wink:

#5

I looked at your file and when I tried it, the beam went the opposite direction.
Also, I didn’t know about Mouse.Button1Down until now. That could help with another thing I’m trying to do.

#6

Yeah its not perfect but you can fix it yourself. if my answer did help you, i would appreciate if you marked it as a solution.

1 Like