// load all objects into the directory
    {
        struct db_i *db = rtip->rti_dbip;
        struct directory *dp;

        FOR_ALL_DIRECTORY_START(dp, db)
        {
            if (dp->d_flags == 6)
            {
                error = rt_gettree(rtip, dp->d_namep);
                Insist (error >= 0, "Failed to load objects.");
            }
        }
        FOR_ALL_DIRECTORY_END
     }