Invisibility Script

-- Shared ModuleScript (in ReplicatedStorage under Folder "shared")

return function(Player, Transparency)

    -- Get Character and Appropriate Transparency value if not already passed TransparencyVal = (1+1)%2 == 0 or (0+1)%2 == 1
    local Character = Player.Character or Player.CharacterAdded:Wait()
    local TransparencyVal = Transparency or (Character:WaitForChild("Head").Transparency+1)%2

    for _, Part in pairs(Character:GetChildren()) do
        -- Srt Transparency of parts according to TransparencyVal
        if (Part:IsA("Part") or Part:IsA("MeshPart")) and Part.Name ~= "HumanoidRootPart" then
            Part.Transparency = TransparencyVal
            if Part.Name == "Head" then
                -- Edge case; if not modified you would be able to see the face
                Part:FindFirstChild("face").Transparency = TransparencyVal
            end
        elseif Part:IsA("Accessory") then
            -- Accessories have part handles that can be manipulated like a part
            Part.Handle.Transparency = TransparencyVal
        end
    end
end

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-- LocalScript (In StarterPlayerScripts)

local ReplicatedStorage, ContextActionService, Players = game:GetService("ReplicatedStorage"), game:GetService("ContextActionService"), game:GetService("Players")

local Remotes, SharedModules = ReplicatedStorage:WaitForChild("Remotes"), ReplicatedStorage:WaitForChild("shared")
local Player = Players.LocalPlayer

local Transparency = -0.7

local function SendReqForInvisibility(ActionName, Input)
    -- The Bind function may be called to make the player visible or invisible
    if ActionName == "Invisibility" and Input == Enum.UserInputState.Begin then
        -- We invoke server to make sure the server makes the player invisible to everybody else
        -- If we did not do this, the server would take longer than the client to make itself invisible, and the client would be invisible even to itself
        Remotes.MakeInvisible:InvokeServer()
        -- Asjust transparency
        Transparency = -Transparency
        -- Same action as server, but we pass a transparency value as an argument
        require(SharedModules.Invisibility)(Player, Transparency)
    end
end

-- Binds Keycode E to function "SendReqForInvisibility"
ContextActionService:BindAction("Invisibility", SendReqForInvisibility, false, Enum.KeyCode.E)

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-- ServerScript (in ServerScriptService)

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local Remotes, SharedModules = ReplicatedStorage:WaitForChild("Remotes"), ReplicatedStorage:WaitForChild("shared")

local function MakeInvisible(Player)
    -- Calls the function inside Shared ModuleScript, no transparency value is passed so the module will determine the appropriate value on its own
    return require(SharedModules.Invisibility)(Player)
end

Remotes.MakeInvisible.OnServerInvoke = MakeInvisible