GetDirection of wedged face

--returns unit vector n, the normal of the face of Part `part` which contains Vector3 `pos`
local function GetNormal(part, pos)
    local abs = math.abs
    local shape = part:IsA("Part") and part.Shape.Value or part:IsA("WedgePart") and 3 or part:IsA("CornerWedgePart") and 4
    if shape == 0 or shape == 2 then
        return (pos-part.Position).unit
    elseif shape == 1 or shape == 3 then
        local vec = part.CFrame:pointToObjectSpace(pos)/part.Size
        local rot = part.CFrame-part.Position
        local x, y, z = vec.X, vec.Y, vec.Z
        if x > 0.499 then return rot * Vector3.new(1, 0, 0)
        elseif x < -0.499 then return rot * Vector3.new(-1, 0, 0)
        elseif shape == 1 and y > 0.499 then return rot * Vector3.new(0, 1, 0)
        elseif y < -0.499 then return rot * Vector3.new(0, -1, 0)
        elseif z > 0.499 then return rot * Vector3.new(0, 0, 1)
        elseif shape == 1 and z < 0.499 then return rot * Vector3.new(0, 0, -1)
        end
        return rot * Vector3.new(0, part.Size.Z, -part.Size.Y).unit
    elseif shape == 4 then
        local vec = part.CFrame:pointToObjectSpace(pos)/part.Size
        local rot = part.CFrame-part.Position
        local x, y, z = vec.X, vec.Y, vec.Z
        if x > 0.499 then return rot * Vector3.new(1, 0, 0)
        elseif y < -0.499 then return rot * Vector3.new(0, -1, 0)
        elseif z < -0.499 then return rot * Vector3.new(0, 0, -1)
        elseif vec.unit:Dot(Vector3.new(0.707106769, 0, 0.707106769)) > 0 then return rot * Vector3.new(0, part.Size.Z, part.Size.Y).unit
        end
        return rot * Vector3.new(-part.Size.Y, part.Size.X, 0).unit
    end
end