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

All WDT Files in 1.12.X have Version 18.

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MPHD - Map Header

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

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_HasADT = 0x1,
Flag_Loaded = 0x2,

We just need to know the 0x1 flag. The corresponding ADT File is found in World\Maps\<MAPNAME>\<MAPNAME>_XX_YY.adt

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MWMO - Map World Map Object

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

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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