roblox mirror script

local function reflectOne(part, mirror, mod)

	local x,y,z,r00,r01,r02,r10,r11,r12,r20,r21,r22 = mirror.CFrame:toObjectSpace(part.CFrame):components()

	local mpart = part:Clone()

	mpart.CFrame = mirror.CFrame:toWorldSpace(CFrame.new(-x,y,z,r00,-r01,-r02,-r10,r11,r12,-r20,r21,r22))

	-- CornerWedgeParts are not symmetric so we rotate 90 degrees about
	-- the y axis and exchange the x and z sizes.  (Currently only works
	-- right with integer sized parts since we cannot script other resolutions.)
	if part.className == "CornerWedgePart" then

		mpart.Size = Vector3.new(mpart.Size.z, mpart.Size.y, mpart.Size.x)
		mpart.CFrame = mpart.CFrame * CFrame.Angles(0,math.rad(90),0)
	end

	mpart.Parent = mod
end

------------------------------------------------------------
-- Clone and reflect all Parts and WedgeParts in everything in this
-- model and recursively all contained models.

local function reflectAll( srcModel, mirror, tgtModel )

	for k,v in pairs(srcModel:GetChildren()) do

		if v.className == "Model" then
			local m2 = Instance.new("Model", tgtModel)
			m2.Name = v.Name

			reflectAll(v, mirror, m2)

		elseif v:IsA("BasePart")  then

			reflectOne(v, mirror, tgtModel)

		else
			local np = v:Clone()
			np.Parent = tgtModel
		end
	end
end


------------------------------------------------------------
function _G.reflect()

	local list = game.Selection:Get()
	if (not list) or (#list ~= 2) then
		error "Select both the model to be reflected and the mirror part"
	end

	local model = list[1]
	local mirror = list[2]

	if model.className ~= "Model" then
		model,mirror = mirror,model
	end

	if (model.className ~= "Model") or (not mirror:IsA("BasePart")) then
		error "Select both the model to be reflected and the mirror part"
	end

	local mmodel = Instance.new("Model", model.Parent)
	mmodel.Name = model.Name.."-M"

	reflectAll(model, mirror, mmodel)
end


-------------------------------------------------------------------

print("Select the model and mirror part and in command bar type: _G.reflect()")