Return Surface Enum

function GetSurface(part, pos)
    local rel = part.CFrame:pointToObjectSpace(pos)
    --if math.abs(rel.X) < part.Size.X  and math.abs(rel.Y) < part.Size.Y and math.abs(rel.Z) < part.Size.Z then
    if math.abs(rel.Z) > math.abs(rel.Y) and math.abs(rel.Z) > math.abs(rel.X) then
        if rel.Z > 0 then
            return Enum.NormalId.Back
        else
            return Enum.NormalId.Front
        end
    elseif math.abs(rel.Y) > math.abs(rel.Z) and math.abs(rel.Y) > math.abs(rel.X) then
        if rel.Y > 0 then
            return Enum.NormalId.Top
        else
            return Enum.NormalId.Bottom
        end
    elseif math.abs(rel.X) > math.abs(rel.Z) and math.abs(rel.X) > math.abs(rel.Y) then
        if rel.X > 0 then
            return Enum.NormalId.Right
        else
            return Enum.NormalId.Left
        end
    end
end