Paint

Player = game.Players.LocalPlayer
m = Player:GetMouse()
function Cast(p1,p2)
    return CFrame.new(p1.p,p2.p)*CFrame.new(0,0,-(p1.p-p2.p).magnitude/2),(p1.p-p2.p).magnitude
end
Paint = {}
repeat wait() until Player.Backpack
local Tool = Instance.new("HopperBin",Player.Backpack)
Tool.Name = "Paint"
Color = "Black"
Drawing = false
LastPart = nil
Tool.Selected:connect(function(ms)
    ms.Button1Down:connect(function()
        Drawing = true
    end)
    ms.Button1Up:connect(function()
        Drawing = false
    end)
end)
Tool.Deselected:connect(function()
    Drawing = false
end)
cy = function()
    local T = tick()
    coroutine.yield(coroutine.resume(coroutine.create(function() end)))
    return tick()-T
end
sleep = function(time)
    if not time or time == 0 then
        time = cy()
    end
    local t = 0
    repeat
        local T = tick()
        coroutine.yield(coroutine.resume(coroutine.create(function() end)))
        t = t + (tick()-T)
    until t >= time
    return t
end
while sleep(0.005) do
    if Drawing then
        if LastPart then
            local P = Instance.new("Part",Player.Character)
            P.Anchored = true
            P.Transparency = 0.5
            P.FormFactor = "Custom"
            P.Size = Vector3.new(0,0,0)
            P.CFrame = m.Hit
            local Ray,Length = Cast(LastPart.CFrame,P.CFrame)
            local P2 = Instance.new("Part",Player.Character)
            P2.Anchored = true
            P2.Name = "Paint"
            P2.FormFactor = "Custom"
            P2.TopSurface = "Smooth"
            P2.BottomSurface = "Smooth"
            P2.BrickColor = BrickColor.new(Color)
            P2.Size = Vector3.new(0.4,0.4,Length)
            P2.CFrame = Ray
            LastPart = P
        else
            local P = Instance.new("Part",Player.Character)
            P.Anchored = true
            P.Transparency = 0.5
            P.FormFactor = "Custom"
            P.Size = Vector3.new(0,0,0)
            P.CFrame = m.Hit
            LastPart = P
        end
    else
        LastPart = nil
    end
end