WDT files

Introduction

WDT files specify exactly which map tiles are present in a world, if any, and can also reference a "global" WMO. They have a Chunked File Structure.

Chunks

MVER - Map Version

Identifier	MVER
Length	4 bytes

This chunk specifies the format version. All WDT Files in 1.12.X have Version 18.

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MPHD - Map Header

Identifier	MPHD
Length	32 bytes

This chunk is the Map header. It contains 8 int32 Values.

00h      uint32          flags;
04h      uint32          something;
08h      uint32          unused[6];

Flags values are not well understood. From Wowdev:

Flag     Description
--------------------------------------------------------------------------------------------------------
0x01     Use global map object definition.
0x02     CMapRenderChunk::SetVertexFormat( 2 ); (else: 1) -- Use vertex shading (ADT.MCNK.MCCV)
0x04     Decides whether to use _env terrain shaders or not: funky and if MCAL has 4096 instead of 2048(?)
0x08     Disables something. No idea what. Another rendering thing. Someone may check all them in wild life..
0x10     if( flags & 0x02 && CMap::enableTerrainShaderVertex ) CMapRenderChunk::SetVertexFormat( 16 ); // cataclysm?

The second integer is not ignored but stores something too. This is even less well understood.

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MAIN Chunk

Identifier	MAIN
Length	32768 bytes

This is the map table data. It contains 64x64 8 byte entries.

00h      uint32          m_flags;
04h      void*           m_area;       // only set during runtime.

Flags:

Flag     Description
-----------------------------------------------------------------
0x01     There is an ADT File for this position
0x02     Set by the client during runtime if the chunk was loaded

We just need to know the 0x01 flag. The corresponding ADT File is found in World\Maps\<MAPNAME>\<MAPNAME>_XX_YY.adt

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MWMO - Map World Map Object

Identifier	MWMO
Length	varies

If there is no terrain in a map (e.g. Deeprun Tram), all entries in the MAIN Chunk are 0. In this, and ONLY in this case, the MWMO Chunk contains exactly one WMO File Name (Zero Terminated).

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MODF Chunk

Identifier	MODF
Length	64 bytes

If the MWMO Chunk is not empty, MODF contains placement information for the WMO.

00h      uint32          ID (index in the MWID list)
04h      uint32          unique identifier for this instance
08h      float[3]        Position (X,Y,Z)
14h      float[3]        Orientation (A,B,C)
20h      float[6]        Bounding Box
38h      uint16          Flags
3Ah      uint16          Doodad set index
3Ch      uint16          Name set?
3Eh      uint16          Padding

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