The flash script to add trails and remove them depending on the players speed

Help and Feedback Scripting Support
#1

this script should add trails from serverstorage when the player reaches 30 speed and remove them when he goes below, like most “the flash” games to create the iconic lightning effect. this is a localscript located in workspace, no errors, it doesnt work.

local serverStorage = game:GetService("ServerStorage")
local runService = game:GetService("RunService")
local player = game:GetService("Players").LocalPlayer
local character = player.Character or script.Parent
local humanoid = character.Humanoid

runService.Heartbeat:Connect(function()
	if humanoid.WalkSpeed > 30 then
		-- Add trails
		local trail = serverStorage.Trail:Clone()
		trail.Parent = character
		trail.Visible = true

		local attachment0 = Instance.new("Attachment", character.Head)
		attachment0.Name = "TrailAttachment0"
		local attachment1 = Instance.new("Attachment", character.UpperTorso)
		attachment1.Name = "TrailAttachment1"

		trail.Attachment0 = attachment0
		trail.Attachment1 = attachment1
	else
		-- Remove trails
		for _, child in pairs(character:GetChildren()) do
			if child:IsA("Trail") then
				child:Destroy()
			end
		end
	end
end)
#2

instead of doing a heartbeat, you could just do a loop that checks the speed every time it changes. this probably wont fix your issue but it might

local serverStorage = game:GetService("ServerStorage")
local player = game:GetService("Players").LocalPlayer
local character = player.Character or script.Parent
local humanoid = character.Humanoid

character.Humanoid.WalkSpeed.Changed:Connect(function(newSpeed)
if newSpeed >= 30 then
local trail = serverStorage.Trail:Clone()
		trail.Parent = character
		trail.Visible = true

		local attachment0 = Instance.new("Attachment", character.Head)
		attachment0.Name = "TrailAttachment0"
		local attachment1 = Instance.new("Attachment", character.UpperTorso)
		attachment1.Name = "TrailAttachment1"

		trail.Attachment0 = attachment0
		trail.Attachment1 = attachment1
else
		-- Remove trails
		for _, child in pairs(character:GetChildren()) do
			if child:IsA("Trail") then
				child:Destroy()
			end
		end
end
end)
#3

it doesnt fix it indeed, but thanks for the suggestion! :slight_smile:

#4

this could be happening because you’re doing all of this in a local script. try firing a remote event when their speed is over 30 and then add the trail on the server

#5

i added a script inside workspace to add the remoteevent

local replicatedStorage = game:GetService("ReplicatedStorage")

local remoteEvent = Instance.new("RemoteEvent")
remoteEvent.Name = "AddTrail"
remoteEvent.Parent = replicatedStorage

then i added this script into starterplayerscripts

local player = game:GetService("Players").LocalPlayer
local character = player.Character or script.Parent
local humanoid = character.Humanoid

local remoteEvent = game:GetService("ReplicatedStorage").RemoteEvent

game:GetService("RunService").Heartbeat:Connect(function()
    if humanoid.WalkSpeed > 30 then
        remoteEvent:FireServer()
    end
end)

and at last this one in serverscriptservice

local serverStorage = game:GetService("ServerStorage")
local remoteEvent = game:GetService("ReplicatedStorage").RemoteEvent

remoteEvent.OnServerEvent:Connect(function(player)
    local character = player.Character
    local trail = serverStorage.Trail:Clone()
    trail.Parent = character

    local attachment0 = Instance.new("Attachment", character.Head)
    attachment0.Name = "TrailAttachment0"
    local attachment1 = Instance.new("Attachment", character.UpperTorso)
    attachment1.Name = "TrailAttachment1"

    trail.Attachment0 = attachment0
    trail.Attachment1 = attachment1
end)

all server side and it still doesnt work