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Groups

Groups are collections of records, and are used to improve scanning of files to make it easier to skip over records that the reading program is not interested in. In addition to this, subgroups for WRLD and CELL provide some useful structural information (e.g., the division of cell data into persistent and non-persistent references).

Group Format

Name Type Description
type char[4] Always "GRUP".
groupSize uint32 Size of the group, including the 24 bytes before the data.
label byte[4] Format depends on the group type.
groupType int32 The group type. See the section below for details.
stamp uint16 A date stamp. The first byte is the day of the month, and the second byte is the number of months since some unknown point in time (perhaps April 2009, when Obsidian is said to have began development of Fallout: New Vegas).
Unknown byte[6]
data byte[groupSize - 24] The records and subgroups contained within the group.

Group Types

Group Type Label Type Group Type Name Label Info Group Info
0 char[4] Top Level A record type. Contains records of the given type.
1 formid World Children A WRLD record FormID. Contains ROAD and/or CELL records that are children of the given WRLD record.
2 int32 Interior Cell Block A cell block number.
3 int32 Interior Cell Sub-Block A cell sub-block number.
4 int16 Exterior Cell Block Cell block grid (Y, X) coordinates, stored as int8 values.
5 int16 Exterior Cell Sub-Block Cell sub-block grid (Y, X) coordinates, stored as int8 values.
6 formid Cell Children A CELL record FormID. Contains only REFR, ACRE, PGRE, PMIS or ACHR records that are children of the given CELL record.
7 formid Topic Children A DIAL record FormID. Contains INFO records that are children of the given DIAL record.
8 formid Cell Persistent Children A CELL record FormID. The group must contain only REFR, ACRE, PGRE, PMIS or ACHR records that are children of the given CELL record.
9 formid Cell Temporary Children A CELL record FormID. The group must contain only REFR, ACRE, PGRE, PMIS or ACHR records that are children of the given CELL record.
10 formid Cell Visible Distant Children A CELL record FormID. The group must contain only REFR records that are children of the given CELL record.

Top-Level Groups

The top level groups are stored in the following order in FalloutNV.esm. It is unknown if this order is required, but it would be best to follow it just in case.

GMST, TXST, MICN, GLOB, CLAS, FACT, HDPT, HAIR, EYES, RACE, SOUN, ASPC, MGEF, SCPT, LTEX, ENCH, SPEL, ACTI, TACT, TERM, ARMO, BOOK, CONT, DOOR, INGR, LIGH, MISC, STAT, SCOL, MSTT, PWAT, GRAS, TREE, FURN, WEAP, AMMO, NPC_, CREA, LVLC, LVLN, KEYM, ALCH, IDLM, NOTE, COBJ, PROJ, LVLI, WTHR, CLMT, REGN, NAVI, DIAL, QUST, IDLE, PACK, CSTY, LSCR, ANIO, WATR, EFSH, EXPL, DEBR, IMGS, IMAD, FLST, PERK, BPTD, ADDN, AVIF, RADS, CAMS, CPTH, VTYP, IPCT, IPDS, ARMA, ECZN, MESG, RGDL, DOBJ, LGTM, MUSC, IMOD, REPU, RCPE, RCCT, CHIP, CSNO, LSCT, MSET, ALOC, CHAL, AMEF, CCRD, CMNY, CDCK, DEHY, HUNG, SLPD, CELL, WRLD

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