.ymap

.ymap is compressed file format which is used as map system placement. Since GTA5, this format has XML structure.

YTYP Formats

YMAP has some formats

External Format
Stream Format
Long Format
Interior Format

External Format is parent format which is used to place the LODs.

Stream Format is child format of External. We use it to place normal objects. Objects gets LodIndex from External format.

Long Format is child format of external. It's used for props and grass placement.

Interior Format is child format of external. It has MLO system and used to place the interior and its objects.

CMapData

<name> </name>

This tag is used to put the name of ymap file. e.g:

<name>bt1_01</name>

File must be named as bt1_01.ymap

<parent></parent>

It connects ymap to ytyp file. e.g:

<parent>ss1_lod</parent>

We connect bt1_01.ymap to ss1_lod.ytyp. File parse objects information from YTYP file.

<Flags Value>

It's unknown what flag does. Some external formats uses value "2" and others are "0". YTYP format use this section too.

<entities>

This section enumerate objects and sections in ymap file.

<CEntityDef>

     <archetypeName> - Model name hash
     <flags value/> - Flag object
     <guid value>
     <position x="" y="" z=""> - object coordinates
     <rotation x="" y="" z="" w=""> - object rotation
     <hash_9CA32637> - unknown
     <hash_10FB7C42> - unknown
     <parentIndex value="" /> - Lod Index (?)
     <lodDist value="" /> - Lod Distance
     <hash_CA974BCD> - unknown
     <hash_6C8F1715> - unknown
     <hash_A687AC89> - unknown
     <hash_2691F019> - unknown
     <extensions /> - tag include additional params.
     <hash_18C1D58/> - R color?
     <hash_23C0E543/> - G color?
     <hash_3C852527/> - B color?