Sims 3:0x046A7235

Header

DWORD version 5
DWORD 2
DWORD 7
DWORD section 1 size
-- Section 1 data
-- Section 2 data
DWORD section 3 size
DWORD section 4 size
-- Section 3 data
-- Section 4 data
-- Section 5 data

Section 1

DWORD section 2 size
QWORD lot ID
WORD
WORD
DWORD
DWORD
4 DWORDs
3 BYTEs
MATRIX4x4 lot to world transformation
MATRIX4x4 world to lot transformation
DWORD
QWORD lot ID (Again)
QWORD lot ID (Again)
FLOAT (Usually -0.5 or 1.0)
FLOAT 0.0
FLOAT 0.123
DWORD (Typically 0x4000000 or 0x84000000)
4 FLOATS lot coordinate bounds (-0.5 to lot size + 0.5)
DWORD count1
REP count1
    DWORD
DWORD count2
REP count2
    DWORD subcount2a
    REP subcount2a
        DWORD
    DWORD subcount2b
    REP subcount2b
        DWORD
    DWORD subcount2c
    REP subcount2c
        WORD
    DWORD subcount2d
    REP subcount2d
        DWORD subcount2d1
        REP subcount2d1
            WORD
            SINGLE (1.0)
    BYTE 1
DWORD count3
REP count3
    WORD
    BYTE
    BYTE
    BYTE
DWORD count4
REP count4
    WORD
    WORD
    WORD
    WORD

Section 2

DWORD
DWORD s2entries
REP s3entries
    DWORD
    QWORD id (Object ID or special id)
    DWORD
    2 FLOATS
    DWORD
    2 FLOATS
    DWORD
    2 FLOATS
    5 DWORDS
    WORD
    WORD
    DWORD
    WORD
    DWORD
    FLOAT
    FLOAT

Section 3

DWORD s3entries
REP s3entries
    4 DWORDS
    DWORD s3subentry1
    REP s3subentry1
        DWORD
        2 BYTES
        WORD
    DWORD s3subentry2
    REP s3subentry2
        BYTE unk1
        BYTE unk2
        BYTE unk3
        BYTE unk4
        IF unk1 = 0 OR unk2 != 0 OR unk3 != 0 (There has to be a simpler test than this)
            REP unk4
                DWORD
                8 BYTES
DWORD 3

Section 4

DWORD s4entries
DWORD (Some value less than s4entries)
REP s4entries
    DWORD datatype
    -- type dependent data
    DWORD

Type 1

DWORD

Type 2

QWORD lot id
QWORD special id
FLOAT
DWORD
FLOAT
4 BYTES
DWORD count
REP count
    DWORD subcount
    REP subcount
        DWORD pointcount
        REP pointcount
            FLOAT x coordinate
            FLOAT y coordinate
    BYTE 1

Type 3

(Same as type 2 format)

Type 4

Object footprint?

QWORD lot id
QWORD object id
FLOAT
DWORD
FLOAT
4 BYTES
DWORD count
REP count
    DWORD subcount
    REP subcount
        DWORD pointcount
        REP pointcount
            FLOAT x coordinate
            FLOAT y coordinate
    BYTE 1

Type 6

(Same as type 2 format)

Type 7

Lot footprint?

QWORD lot id
QWORD lot id (Again)
FLOAT
DWORD
FLOAT
4 BYTES

Type 8

(Same as type 2 data)

Section 5

DWORD s5entries
REP s5entries
    WORD
    BYTE
    BYTE
    DWORD

Special IDs

In some cases rather than a LOT ID (Which always ends with the last 4 bits 0) the data contains what I've termed a special ID. This appears to use the 8 bytes slightly differently.

BYTE 5
BYTE ID type
WORD
WORD
BYTE (Signed)
BYTE (Always 0)

However this could all be coincidental, as the typical lot or object ID looks, to the casual observer, like a DWORD followed by two WORDs.

The following ID types have been observed...

ID type	Context
3	Section 4 type 6 data
12	Section 4 type 2 data
13	Section 4 type 8 data
15	Section 4 type 6 data
16	Section 4 type 6 data
18	Section 4 type 2 data Section 2 data
19	Section 4 type 3 data
21	Section 4 type 6 data