local ruin_deg = 10
local light_chance = 100 --The greater the number, less is the chance.

function generate_hallway_segment(pos, size, height, base_material, direction)
    --pos - postion
    --direction - north/south or east/west (2, 1)
    local x,y,z = pos.x,pos.y,pos.z
    local manip = minetest.get_voxel_manip()
    local pos1 = {x = x + size/2, y = y + height, z = z + size/2}
    local pos2 = {x = x - size/2, y = y, z = z - size/2}
    local e1, e2 = manip:read_from_map(pos1, pos2)
    local area = VoxelArea:new{MinEdge=e1, MaxEdge=e2}
    local data = manip:get_data()

    -- A block made out of the material --

    for posX = pos2.x, pos1.x do
        for posY = pos2.y, pos1.y do
            for posZ = pos2.z, pos1.z do
                data[area:index(posX, posY, posZ)] = base_material
            end
        end
    end
    -- Filled directionally with air --
    if direction == 1 then
        for internalX = pos2.x - 1, pos1.x + 1 do
            for internalY = pos2.y + 1, pos1.y - 1 do
                for internalZ = pos2.z + 1, pos1.z - 1 do
                    light = math.random(light_chance)
                    -- And Lights --
                    if light == 25 then
                        data[area:index(internalX, internalY, internalZ)] = c_light
                    else
                        data[area:index(internalX, internalY, internalZ)] = c_air
                    end
                end
            end
        end
    elseif direction == 2 then
        for internalX = pos2.x + 1, pos1.x - 1 do
            for internalY = pos2.y + 1, pos1.y - 1 do
                for internalZ = pos2.z - 1, pos1.z + 1 do
                    light = math.random(50)
                    if light == 25 then
                        data[area:index(internalX, internalY, internalZ)] = c_light
                    else
                        data[area:index(internalX, internalY, internalZ)] = c_air
                    end
                end
            end
        end
    end