Grapple Effect | Created with beams,

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#1

Quick and short,

local Players = game:GetService("Players")
local RunService = game:GetService("RunService")
local UserInputService = game:GetService("UserInputService")

local Player = Players.LocalPlayer
local Character = Player.Character or Player.CharacterAdded:Wait()
local RootPart = Character:WaitForChild("HumanoidRootPart")
local Camera = workspace.CurrentCamera

local GrappleSpeed = 800
local NodeCount = 20
local BeamThickness = 0.8
local WaveCount = 3
local WaveHeight = 1
local SpringDamper = 5
local SpringVelocity = 10
local StraightenSpeed = 10

local Nodes = table.create(NodeCount)
local Beams = table.create(NodeCount - 1)
local GrapplePoint = nil
local IsGrappling = false
local SpringValue = 0
local GrappleProgress = 0
local IsStraightening = false

local function CreateNode(position)
	local Node = Instance.new("Part")
	Node.Anchored = true
	Node.CanCollide = false
	Node.Size = Vector3.new(0.1, 0.1, 0.1)
	Node.Transparency = 0.5
	Node.Color = Color3.new(0, 0, 0)
	Node.Position = position
	Node.Parent = workspace
	return Node
end

local function CreateBeam(StartNode, EndNode)
	local Beam = Instance.new("Beam")
	Beam.Attachment0 = Instance.new("Attachment", StartNode)
	Beam.Attachment1 = Instance.new("Attachment", EndNode)
	Beam.Width0 = BeamThickness
	Beam.Width1 = BeamThickness
	Beam.Color = ColorSequence.new(Color3.new(0, 0, 0))
	Beam.Parent = workspace
	Beam.FaceCamera = true
	return Beam
end

local function CleanupGrapple()
	for _, Node in ipairs(Nodes) do
		Node:Destroy()
	end
	for _, Beam in ipairs(Beams) do
		Beam:Destroy()
	end
	table.clear(Nodes)
	table.clear(Beams)
end

local function CreateGrapple()
	CleanupGrapple()
	for i = 1, NodeCount do
		Nodes[i] = CreateNode(RootPart.Position)
		if i > 1 then
			Beams[i - 1] = CreateBeam(Nodes[i - 1], Nodes[i])
		end
	end
end

local function UpdateSpring(DeltaTime)
	if IsStraightening then
		SpringValue = 0
	else
		local Delta = SpringVelocity * DeltaTime
		SpringValue = SpringValue + Delta
		SpringValue = SpringValue * (1 - SpringDamper * DeltaTime)
	end
end

local function UpdateGrapple(DeltaTime)
	if not GrapplePoint or not RootPart then return end

	local Direction = (GrapplePoint - RootPart.Position).Unit
	local Distance = (GrapplePoint - RootPart.Position).Magnitude

	GrappleProgress = math.min(GrappleProgress + GrappleSpeed * DeltaTime, Distance)
	local T = GrappleProgress / Distance

	if IsStraightening then
		for i = 1, NodeCount do
			local NodeT = i / NodeCount
			local TargetPosition = RootPart.Position + Direction * (NodeT * Distance)
			Nodes[i].Position = Nodes[i].Position:Lerp(TargetPosition, DeltaTime * StraightenSpeed)
		end
	else
		for i = 1, NodeCount do
			local NodeT = i / NodeCount
			local CurveOffset = CFrame.lookAt(RootPart.Position, GrapplePoint).UpVector * WaveHeight * math.sin(NodeT * WaveCount * math.pi) * SpringValue
			local NodePosition = RootPart.Position + Direction * (NodeT * GrappleProgress) + CurveOffset
			Nodes[i].Position = Nodes[i].Position:Lerp(NodePosition, DeltaTime * 10)
		end

		if GrappleProgress >= Distance then
			IsStraightening = true
			SpringValue = 0
		end
	end
end

UserInputService.InputBegan:Connect(function(Input, GameProcessed)
	if GameProcessed then return end
	if Input.UserInputType == Enum.UserInputType.MouseButton1 then
		local MouseRay = Camera:ScreenPointToRay(Input.Position.X, Input.Position.Y)
		local RaycastParams = RaycastParams.new()
		RaycastParams.FilterType = Enum.RaycastFilterType.Blacklist
		RaycastParams.FilterDescendantsInstances = {Character}

		local Result = workspace:Raycast(MouseRay.Origin, MouseRay.Direction * 1000, RaycastParams)
		if Result then
			GrapplePoint = Result.Position
			IsGrappling = true
			IsStraightening = false
			GrappleProgress = 0
			SpringValue = 1 
			CreateGrapple()
		end
	end
end)

UserInputService.InputEnded:Connect(function(Input, GameProcessed)
	if Input.UserInputType == Enum.UserInputType.MouseButton1 then
		IsGrappling = false
		IsStraightening = false
		CleanupGrapple()
	end
end)

RunService.RenderStepped:Connect(function(DeltaTime)
	if IsGrappling then
		UpdateSpring(DeltaTime)
		UpdateGrapple(DeltaTime)
	end
end)
12 Likes
#2

quite promising here, it was one of the features that I’ve been trying to make since Path2D releases but it fails to rotate to face on camera, i always blamed how Beams only limit to just 4 points only.

it’s sort of similar to my second attempt except mine is way awfully pain,.,…,.,.,.,. gonna give this a try

3 Likes
#3

I have made this effect with a roblox rope before, im trying to figure it out. Its a way better way of this

#4

nice work. you may also calculate the CurveSize0 and CurveSize1 to make it even more wiggly and smooth between two nodes.

1 Like
#5

I wonder if this can be used to make a repel system where you can climb walls.