Minecraft Terrain Generator

function round(x)
  	if x%2 ~= 0.5 then
    	return math.floor(x+0.5)
  	end
  	return x-0.5
end
function putTexture(part, frontF, backF, topF, bottomF, leftF, rightF, className)
	local faces = {"Front", "Back", "Top", "Bottom", "Left", "Right"}
	for i,f in pairs(faces) do
		local decal = Instance.new(className, part)
		decal.StudsPerTileU = 2.6
		decal.StudsPerTileV = 2.6
		if i == 1 then decal.Texture = frontF decal.Name = f end
		if i == 2 then decal.Texture = backF or frontF decal.Name = f  end
		if i == 3 then decal.Texture = topF or frontF decal.Name = f  end
		if i == 4 then decal.Texture = bottomF or frontF decal.Name = f end
		if i == 5 then decal.Texture = leftF or frontF decal.Name = f  end
		if i == 6 then decal.Texture = rightF or frontF decal.Name = f  end
		decal.Face = f
	end
	return part
end
local x1 = 60
local z1 = 5
local y1 = 60
local RS = game:GetService("RunService").RenderStepped
for x = 1, y1 do
	for z = 1, x1 do
		for y = 1, z1 do
			local block = Instance.new("Part", workspace)
			block.Material = "Fabric"
			block.Anchored = true
			block.Size = Vector3.new(2.6, 2.6, 2.6)
			block.CFrame = CFrame.new((x1/2) + x * 2.6, (round((math.noise(x/12, 0.154, z/12)*26) / 2.6) * 2.6) - (y * 2.6), (z1/2) + z * 2.6)
			if y == 1 then
				putTexture(block, "rbxassetid://96430337", "rbxassetid://96430337",
					"rbxassetid://96430265", "rbxassetid://179655033",
				 	"rbxassetid://96430337", "rbxassetid://96430337", "Texture")
			elseif y == 2 then
				putTexture(block, "rbxassetid://179655033", "rbxassetid://179655033",
					"rbxassetid://179655033", "rbxassetid://179655033",
				 	"rbxassetid://179655033", "rbxassetid://179655033", "Texture")
			elseif y >= 3 then
				putTexture(block, "rbxassetid://75880927", "rbxassetid://75880927",
					"rbxassetid://75880927", "rbxassetid://75880927",
				 	"rbxassetid://75880927", "rbxassetid://75880927", "Texture")
			end
		end
	end
	RS:wait()
end