Making a rotated brick grow only one one side?

Free model is here

Here's some code that should work.

Note - use the Front Surface as the edge of the door that closes, and increment must be greater than one. I used 1.01

Put this in a server script...

New Answer:

function difference(n1,n2)
    return math.abs(n2-n1)
end

function invertFace(face)
    if face == Enum.NormalId.Front then
        return Enum.NormalId.Back
    elseif face == Enum.NormalId.Back then
        return Enum.NormalId.Front
    elseif face == Enum.NormalId.Top then
        return Enum.NormalId.Bottom
    elseif face == Enum.NormalId.Bottom then
        return Enum.NormalId.Top
    elseif face == Enum.NormalId.Left then
        return Enum.NormalId.Right
    elseif face == Enum.NormalId.Right then
        return Enum.NormalId.Left
    end
end
function getPositiveFace(face)
    if face == Enum.NormalId.Top or face == Enum.NormalId.Right or face == Enum.NormalId.Back then
        return face
    else
        return invertFace(face)
    end
end
function getFacePosition(object,face)
    return ((object.CFrame * CFrame.new(object.Size/2 * Vector3.FromNormalId(face))).p * Vector3.FromNormalId(getPositiveFace(face))).magnitude
end
lastDistR = 0
lastDistL = 0
lastDistF = 0
lastDistB = 0
lastDistT = 0
lastDistB2 = 0
function closeDoor(part,side, distance)
    --local part = handles.Adornee
    if part == nil then return end



    if tostring(side) == "Enum.NormalId.Front" then
        if distance - lastDistF > 1 then
            local newDist = math.floor(distance - lastDistF)
            local cf = part.CFrame
            local lv = cf.lookVector
            local cf2 = part.CFrame
            local size = part.Size
            part.Size = Vector3.new(part.Size.x, part.Size.y, part.Size.z + newDist)
            if part.Size == size then
                part.CFrame = cf2 + lv * (0.5*newDist)
                cf2 = part.CFrame
            end
            part.CFrame = cf2 + lv * (0.5*newDist)
            lastDistF = lastDistF + newDist
        else
            if distance - lastDistF < -1 and part.Size.z + math.ceil(distance - lastDistF) < 1 then
                local newDist = -(part.Size.z - 1)
                local cf = part.CFrame
                local lv = cf.lookVector
                local cf2 = part.CFrame
                local size = part.Size
                part.Size = Vector3.new(part.Size.x, part.Size.y, part.Size.z + newDist)
                if part.Size == size then
                    part.CFrame = cf2 + lv * (0.5*newDist)
                    cf2 = part.CFrame
                end
                part.CFrame = cf2 + lv * (0.5*newDist)
                lastDistF = lastDistF + newDist
            else
                if distance - lastDistF < -1 and part.Size.z + math.ceil(distance - lastDistF) > 0  then
                    local newDist = math.ceil(distance - lastDistF)
                    local cf = part.CFrame
                    local lv = cf.lookVector
                    local cf2 = part.CFrame
                    local size = part.Size
                    part.Size = Vector3.new(part.Size.x, part.Size.y, part.Size.z + newDist)
                    if part.Size == size then
                        part.CFrame = cf2 + lv * (0.5*newDist)
                        cf2 = part.CFrame
                    end
                    part.CFrame = cf2 + lv * (0.5*newDist)
                    lastDistF = lastDistF + newDist
                end
            end
        end
    end






end
local increment = 1.01
local max_size = 10
local obj1 = script.Parent
local eye = script.Parent.Parent.eye
local face1 = Enum.NormalId.Front


        local Direction = obj1.CFrame.lookVector --+ Vector3.new(0,0,0)

        local Look = (Direction).unit --for whatever reason -90 had to be changed to 90
        local ray = Ray.new(obj1.CFrame.p, Look*500) -- -5 to clear the entrance ramp elevator with the ray and * 300 is the distance of the ray - you must be this close to the ground
        local ignorelist = {}
        table.insert(ignorelist,obj1)       
    --  table.insert(ignorelist,eye)            

        local part3, position = game.Workspace:FindPartOnRayWithIgnoreList(ray,ignorelist)
        print("part found: "..part3.Name)

        max_size = (part3.Position- obj1.CFrame.p).magnitude + 2
        --max_size = max_size + (obj1.Size/2 * Vector3.FromNormalId(Enum.NormalId.Back)).magnitude 
        print("max_size: "..max_size)
local function ontouched(hit)

    if hit.Parent:FindFirstChild("Humanoid") then
        local total = 0
        while total < max_size do

            closeDoor(obj1,face1,(increment*-1.0))
            lastDistF    = 0
            wait(.001)  
            total = total + increment
        end
        wait(5)
        local total = 0
        while total < max_size do

            closeDoor(obj1,face1,increment)
            lastDistF    = 0
            wait(.001)  
            total = total + increment
        end
        wait(5)
    end

end

script.Parent.Touched:connect(ontouched)