SurfaceHit_Function

getLeast = function(tab)
    startnum = math.huge
    ind = 0
    if type(tab) == "table" then
        for i, v in pairs(tab) do
            if type(v) == "number" and v < startnum then
                startnum = v
                ind = i
            end
        end
    end
    return startnum ~= math.huge and startnum, ind or startnum == math.huge and "error"
end
--
getSurfaceHit = function(obj, hitter)
    SurfaceTable = {"FrontSurface", "BackSurface", "RightSurface", "LeftSurface", "TopSurface", "BottomSurface"}
    local lengthx = obj.Size.X/2
    local lengthy = obj.Size.Y/2
    local lengthz = obj.Size.Z/2
    local front = (obj.CFrame*(obj.CFrame:toObjectSpace(obj.CFrame).lookVector*lengthz))
    local back = (obj.CFrame*(obj.CFrame:toObjectSpace(obj.CFrame).lookVector*-lengthz))
    local right = (obj.CFrame*CFrame.Angles(0, math.rad(-90), 0))*(obj.CFrame:toObjectSpace(obj.CFrame).lookVector*lengthx)
    local left = (obj.CFrame*CFrame.Angles(0, math.rad(90), 0))*(obj.CFrame:toObjectSpace(obj.CFrame).lookVector*lengthx)
    local top = (obj.CFrame*CFrame.Angles(math.rad(90), 0, 0))*(obj.CFrame:toObjectSpace(obj.CFrame).lookVector*lengthy)
    local bottom = (obj.CFrame*CFrame.Angles(math.rad(-90), 0, 0))*(obj.CFrame:toObjectSpace(obj.CFrame).lookVector*lengthy)
    --
    local num, index = getLeast({(hitter.Position-front).magnitude, (hitter.Position-back).magnitude, (hitter.Position-right).magnitude, (hitter.Position-left).magnitude, (hitter.Position-top).magnitude, (hitter.Position-bottom).magnitude})
    print(num, index, SurfaceTable[index])
    return SurfaceTable[index]
end
--
for i, v in pairs(script.Parent:GetChildren()) do
    if v:IsA("BasePart") then
        v.Touched:connect(function(hit)
            surface = getSurfaceHit(v, hit)
            print(surface)
            v[surface] = "Studs"
        end)
    end
end