Spray paint system

local mouse = game.Players.LocalPlayer:GetMouse()
local isMouseOnHold = false
local isEquipped = false


function getAngleBetween(u, v, axis)
    local dot, uxv = u:Dot(v), u:Cross(v)
    if dot < -0.99999 then return CFrame.fromAxisAngle(axis, math.pi) end
    return CFrame.new(0,0,0, uxv.x, uxv.y, uxv.z, 1+dot)
end

script.Parent.Unequipped:Connect(function()
    isEquipped = false
end)

script.Parent.Equipped:Connect(function()
    isEquipped = true
    mouse.Button1Down:Connect(function()
        isMouseOnHold = true
    end)
    mouse.Button1Up:Connect(function()
        isMouseOnHold = false
    end)
end)

local paints = {}

mouse.Move:Connect(function()
    if isMouseOnHold and isEquipped then
        local ro = workspace.CurrentCamera.CFrame.Position
        local raycastParams = RaycastParams.new()
        raycastParams.FilterDescendantsInstances = paints
        local raycastResults = workspace:Raycast(ro, mouse.UnitRay.Direction*1000, raycastParams)
        if raycastResults then
            local p = Instance.new("Part", workspace.Debris)
            p.Size = Vector3.new(1,0.25,1)
            p.Anchored = true
            p.CFrame = getAngleBetween(p.CFrame.UpVector, raycastResults.Normal, ro)
            p.Position = mouse.Hit.Position
            p.CanCollide = false
            table.insert(paints, p)
        end
    end
end)