FF8/WorldMap wmx

By MaKiPL. All thanks goes to Halfer, for rich research progress on world map file. This wiki page is also based on Blue's wmx2obj source code.

General

Wmx.obj is world map geometry model only. Contains 835 segments, does not contain textures nor additional info like general header or pointers. Collision is calculated directly from faces. Towns and places on map are part of world map and are created the same way as mountains, ground etc. File size is 0x9000*835. Every 0x9000 a next segments starts.

Segment = contains 16 blocks Block = contains geometry

One segment is 8192 sized (512*16) + header. There is 16 blocks in a segment.

1-768 segments are final world map. 769-835 are story based segments like Balamb garden stationary, no Esthar, No cities in DISC4.

Segment

Segment starts with header (consist offsets for every block). After header a block data appears (a 4 byte header?) and polygon data.

• NOTE: Polygon is two triangles form a plane.

Offset	Length	Description
0	68 bytes	Header data
68	varies	Block data
varies	varies	Padding (00)

Header data

Offset	Length	Description
0	4 bytes	unknown
4	64 (16 * uint32)	Offsets to blocks position. 4 bytes every offset!

Block data

Block data starts with header:

Offset	Length	Description
0	Byte	Polygon count
1	Byte	Vertices count
2	Byte	Shadow(?)
3	Byte	Unknown

Just after header a polygon data appears:

Offset	Length	Description
0	Byte	F1 (Triangle 1)
1	Byte	F2 (Triangle 1)
2	Byte	F3 (Triangle 1)
3	Byte	F1 (Triangle 2)
4	Byte	F2 (Triangle 2)
5	Byte	F3 (Triangle 2)
6	Byte	U1
7	Byte	V1
8	Byte	U2
9	Byte	V2
10	Byte	U3
11	Byte	V3
12	4 BIT/4 BIT	Texture Page/CLUT id
13	Byte	Ground type
14	Byte	Unknown
15	Byte	Unknown

vertices:

Offset	Length	Description
0	short	X vertex
2	short	Z vertex
4	short	Y vertex
6	2 bytes	weight (unused)

Shadow(?) data: 8 bytes long. Currently not really known.