Paths (GTA SA)
Description
The "nodes*.dat" files in "gta3.img" contain the paths and some other path-related information. There's a file for every 750×750 unit square, starting at the south-west corner (-3000,-3000).
Header
Contains information for locating the various sections in the file.
Total 20 bytes:
[DWord, 4b] Number of entries in section 1 [DWord, 4b] Number of entries in section 1a [DWord, 4b] Number of entries in section 1b [DWord, 4b] Number of entries in section 2 [DWord, 4b] Number of entries in section 3/5/6
Section 1
Contains node data for pedestrians and vehicles. Section 1a contains the nodes for vehicles and section 1b contains the nodes for pedestrians.
Total 28 bytes per entry:
[Signed Word, 2b] Unknown [Word, 2b] Unknown [DWord, 4b] Unknown (always zero) [Signed Word, 2b] X-position (must be divided by 8) [Signed Word, 2b] Y-position (must be divided by 8) [Signed Word, 2b] Z-position (must be divided by 8) [Signed Word, 2b] Unknown [Word, 2b] Link ID [Word, 2b] Area ID [Word, 2b] Node ID [Byte, 1b] Path Width [Byte, 1b] Node Type [DWord, 4b] Flags
Explanations for some of these values:-
- Link ID is an index to entries in section 3,5 and 6.
- Area ID is the area of the node, the same as in the filename.
- Node ID is used to refer to nodes in the other sections.
Node Type is some kind of group for the nodes. In section 1a, a Note Type value of 1 is for cars, 2 is for boats and higher values are for race tracks and other mission applications. For peds, there is a node type per village/city.
