local Subitem = vci.assets.GetTransform("Subitem")
local Subitem2 = vci.assets.GetTransform("Subitem2")

function updateAll()
    -- time [0,1]
    local time = 0.5 * math.sin(os.time()) + 0.5
    local rotate = Quaternion.identity
    Subitem.SetRotation(Quaternion.Slerp(rotate, Subitem2.GetRotation(), time));
end