You can write your topic however you want, but you need to answer these questions:
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What do you want to achieve? I am trying to use a GUI that applies a color on a trail that is attached to the character through Remote Events, BUT instead of applying to the player who fires the event, it fires to all characters.
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What is the issue? The event is changing trail colors for all players instead of just the one who fired the event.
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What solutions have you tried so far? I’ve tried changing the color after the trail is applied, trying different parts of the color change event in the trail adding event.
The SERVER Script that applies the trail
local UserInputService = game:GetService("UserInputService")
local ReplicatedStorage = game:GetService("ReplicatedStorage")
-- Items
local trailParts = {'Head', 'HumanoidRootPart','LeftLowerArm','LeftLowerLeg','RightLowerArm','RightLowerLeg','LeftHand','RightHand','LowerTorso','UpperRightArm','UpperLeftArm', 'UpperTorso', 'LeftFoot', 'RightFoot'}
local trail = ReplicatedStorage:WaitForChild("Trail")
local aura = ReplicatedStorage:WaitForChild("Aura")
local trailevent = ReplicatedStorage:WaitForChild("FireTrail")
local change = ReplicatedStorage:WaitForChild("Change")
--idk
game.StarterPlayer.EnableMouseLockOption = false
local red, green, blue = nil, nil, nil
trailevent.OnServerEvent:connect(function(player, action)
local char = player.Character
local humanoid = char:WaitForChild("Humanoid")
-- PART WHERE IT CHANGES ALL COLORS OF TRAILS WHEN ITS ONLY SUPPOSED TO APPLY TO ONE PLR
change.OnServerEvent:Connect(function(plr, color)
local character = plr.Character or plr.CharacterAdded:Wait()
red, green, blue = math.round(color.R * 255), math.round(color.G * 255), math.round(color.B * 255)
end)
-- PART WHERE IT CHANGES ALL COLORS OF TRAILS WHEN ITS ONLY SUPPOSED TO APPLY TO ONE PLR
-- checks if false or true
if action == true then
for index, part in pairs(char:GetChildren()) do
if part:IsA('BasePart') then
if table.find(trailParts, part.Name) then
if not part:FindFirstChildWhichIsA('Trail') or part:FindFirstChildWhichIsA('ParticleEmitter') then
local attachment0 = Instance.new('Attachment', part)
local attachment1 = Instance.new('Attachment', part)
attachment0.Position = Vector3.new(0, 0, 3)
attachment1.Position = attachment0.Position + Vector3.new(0, 0.25, -6)
local Aura = aura:Clone()
Aura.Parent = part
local newTrail = trail:Clone()
newTrail.Parent = part
newTrail.Enabled = true
newTrail.Attachment0 = attachment0
newTrail.Attachment1 = attachment1
newTrail.Color = ColorSequence.new{
ColorSequenceKeypoint.new(0, Color3.fromRGB(red, green, blue)),
ColorSequenceKeypoint.new(1, Color3.fromRGB(red, green, blue))
}
end
end
end
end
elseif action == false then
for index, part in pairs(char:GetChildren()) do
if part:FindFirstChildWhichIsA('Trail') or part:FindFirstChildWhichIsA('ParticleEmitter')then
local oldTrail = part:FindFirstChildWhichIsA('Trail')
local oldAura = part:FindFirstChildWhichIsA('ParticleEmitter')
oldAura:Destroy()
oldTrail.Enabled = false
oldTrail:Destroy()
if humanoid.WalkSpeed < 50 then
oldTrail:Destroy()
oldAura:Destroy()
end
repeat
if part:FindFirstChild('Attachment') then
part:FindFirstChild('Attachment'):Destroy()
end
until not part:FindFirstChild('Attachment')
end
end
end
end)
--[[local function addTrail(v, r, g, b)
local char = v.Parent
local attachment0 = Instance.new('Attachment', v)
local attachment1 = Instance.new('Attachment', v)
attachment0.Position = Vector3.new(0, 0, 3)
attachment1.Position = attachment0.Position + Vector3.new(0, 0.25, -6)
local Aura = aura:Clone()
Aura.Parent = v
local newTrail = trail:Clone()
newTrail.Color = ColorSequence.new{
ColorSequenceKeypoint.new(0, Color3.fromRGB(r, g, b)),
ColorSequenceKeypoint.new(1, Color3.fromRGB(r, g, b))
}
newTrail.Parent = v
newTrail.Enabled = true
newTrail.Attachment0 = attachment0
newTrail.Attachment1 = attachment1
return newTrail, attachment0, attachment1
end]]
--[[change.OnServerEvent:Connect(function(plr, color)
local char = plr.Character
r, g, b = math.round(color.R * 255), math.round(color.G * 255), math.round(color.B * 255)
print(char, r, g, b)
for i, v in char:GetDescendants() do
if v:IsA("Trail") then
v.Color = ColorSequence.new{
ColorSequenceKeypoint.new(0, Color3.fromRGB(r, g, b)),
ColorSequenceKeypoint.new(1, Color3.fromRGB(r, g, b))
}
end
end
end)
change.OnServerEvent:Connect(function(plr, color)
r, g, b = math.round(color.R * 255), math.round(color.G * 255), math.round(color.B * 255)
end)
Aura.Color = ColorSequence.new{
ColorSequenceKeypoint.new(0, Color3.fromRGB(r, g, b)),
ColorSequenceKeypoint.new(1, Color3.fromRGB(r, g, b))
}
newTrail.Color = ColorSequence.new{
ColorSequenceKeypoint.new(0, Color3.fromRGB(r, g, b)),
ColorSequenceKeypoint.new(1, Color3.fromRGB(r, g, b))
}]]
The LOCAL Script that fires the event to change the color of the trail. (Color changes due to 3 values of 3 Textboxes where u can input numbers 1-255 for a rgb value 
)
local spp = script.Parent.Parent.Parent
local players = game:GetService("Players")
local player = players.LocalPlayer
local char = player.Character or player.CharacterAdded:Wait()
script.Parent.MouseButton1Click:Connect(function()
game.ReplicatedStorage.Change:FireServer(Color3.fromRGB(spp.ARED.RED.Text,spp.BGREEN.GREEN.Text,spp.CBLUE.BLUE.Text))
end)
while task.wait() do
script.Parent.BackgroundColor3 = Color3.fromRGB(spp.ARED.RED.Text,spp.BGREEN.GREEN.Text,spp.CBLUE.BLUE.Text)
end
Another LOCAL Script that fires the event to apply the trail when LeftShift is held
-- Services
local UserInputService = game:GetService("UserInputService")
local TweenService = game:GetService("TweenService")
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local RunService = game:GetService("RunService")
--Player
local player = game.Players.LocalPlayer
local char = player.Character
local cam = game.Workspace.CurrentCamera
--Items
local isrunning = false
local cooldown = false
local cdtimer = 3
local trailevent = ReplicatedStorage:WaitForChild("FireTrail")
local humpart = char:WaitForChild("HumanoidRootPart")
local startlightning = script.sound
local sounds = script.sounds
humpart:WaitForChild("Running").Volume = 0
-- starting behaviour
UserInputService.MouseBehavior = Enum.MouseBehavior.LockCenter
UserInputService.MouseDeltaSensitivity = 0.1
char.Humanoid.WalkSpeed = 5
char:WaitForChild("HumanoidRootPart").CustomPhysicalProperties = PhysicalProperties.new(1000, 0, 0)
-- tweens
local goalforrun = {}
goalforrun.FieldOfView = 90
local tweeninfoforrun = TweenInfo.new(1)
local tweenforrun = TweenService:Create(cam, tweeninfoforrun, goalforrun)
local goalforwalk = {}
goalforwalk.FieldOfView = 70
local tweeninfoforwalk = TweenInfo.new(1)
local tweenforwalk = TweenService:Create(cam, tweeninfoforwalk, goalforwalk)
UserInputService.InputBegan:Connect(function(player)
if player.KeyCode == Enum.KeyCode.LeftShift then
if cooldown == true then return end
local Humanoid = char:WaitForChild("Humanoid")
if Humanoid.MoveDirection.Magnitude > 0 then
isrunning = true
if isrunning == true then
cooldown = false
game.Workspace.Gravity = 90
trailevent:FireServer(true)
Humanoid.WalkSpeed = 200
tweenforrun:Play()
end
end
end
task.wait(cdtimer)
cooldown = false
end)
UserInputService.InputEnded:Connect(function(player)
if player.KeyCode == Enum.KeyCode.LeftShift then
local Humanoid = char:WaitForChild("Humanoid")
isrunning = false
if isrunning == false then
game.Workspace.Gravity = 196.2
trailevent:FireServer(false)
Humanoid.WalkSpeed = 5
tweenforwalk:Play()
for i, v in pairs(sounds:GetChildren()) do
v:Stop()
end
end
end
end)
