function bettertrees.assign_uuid(pos1, pos2, nodes)
    local found_nodes = true
    local y = 0
	local uuid = objectuuids.utils.generate_uuid4()
    while found_nodes do
        local objects = minetest.find_nodes_in_area(
            { x = pos.x - 1, y = pos.y + y, z = pos.z - 1 },
            { x = pos.x + 1, y = pos.y + y, z = pos.z + 1 },
            nodes)[0]
        if #objects > 0 do
            for pos in objects do
                local meta = minetest.get_meta(pos)
                meta:set_string('bettertrees_uuid', uuid)
            end
            y = y + 1;
        else
            found_nodes = false
        end
    end
end