OBD:AKVA/0x24
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This is the pathfinding grid data, linked to from the BNV chunk of an AKVA.
The example below is the grid of BNV number 32 from level1_Final.
- (chr_teleport 0 0 gets you there, and then you can use chr_show_bnv=1 and ai2_showgrids=1)
The example was chosen because it's a relatively small grid (45 bytes of data) and illustrates the format completely.
The pathfinding grid is aligned with the x and z axis. The size of the grid along x and z is specified in the DAT.
The grid data is stored in strips, each strip consisting of tiles of a certain type.
- A strip can have any length between 1 and 255, and a width of 1.
- A strip runs along z for fixed x, and can wrap around to the next x if it's longer than the grid.
Tile types are (appearance as visible with ai2_showgrids=1):
- 0 : normal ground (no cross)
- 1 : close vicinity of a wall (gray cross)
- 4 : even closer vicinity of a wall (green cross)
- 9 : wall (red cross)
- 8 : forbidden zone, e.g., inside a column (orange cross)
I didn't document the other tile types (yet): the storage format is the same anyway.
Strips can be stored in two ways:
- Short strips (1 to 15 tiles)
- are stored as one byte
- XY (hexadecimal, with X > 0 )
- stands for a strip of X tiles of type Y
- Long strips (1 to 255 tiles)
- are stored as two bytes
- 0YXX (hexadecimal, with XX > 0 )
- stands for a strip of XX tiles of type Y
The leading zero tells you if you're looking at a long or short strip.
I'm not sure if short strips can wrap around grid borders or not.
- Example (BNV 32 from level1_Final)
- (offsets relative) (make them absolute if you like)
| 0x00: | 00 | FF | 00 | FF | 00 | E1 | E1 | 70 | E1 | E4 | 11 | 50 | 11 | E4 | E9 | 14 | °NONSENSE°ASCII° |
| 0x10: | 11 | 30 | 11 | 14 | 09 | 11 | 48 | 79 | 14 | 11 | 30 | 11 | 14 | 79 | 48 | 39 | °°°°°°°°°°°°°°°° |
| 0x20: | 24 | 19 | 48 | 19 | 64 | 11 | 50 | 11 | 64 | 19 | 48 | 19 | 24 | °° | °° | °° | °°°°°°°°°°°°°°°° |
- Here's the grid this corresponds to
- (the grid's size is 24x35 as specified in the DAT)
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 01 | |||||||||||||||||||||||||||||||||||
| 02 | |||||||||||||||||||||||||||||||||||
| 03 | |||||||||||||||||||||||||||||||||||
| 04 | 255 tiles of type 0 | ||||||||||||||||||||||||||||||||||
| 05 | |||||||||||||||||||||||||||||||||||
| 06 | |||||||||||||||||||||||||||||||||||
| 07 | |||||||||||||||||||||||||||||||||||
| 08 | |||||||||||||||||||||||||||||||||||
| 09 | |||||||||||||||||||||||||||||||||||
| 10 | |||||||||||||||||||||||||||||||||||
| 11 | 255 tiles of type 0 | ||||||||||||||||||||||||||||||||||
| 12 | |||||||||||||||||||||||||||||||||||
| 13 | |||||||||||||||||||||||||||||||||||
| 14 | |||||||||||||||||||||||||||||||||||
| 15 | |||||||||||||||||||||||||||||||||||
| 16 | |||||||||||||||||||||||||||||||||||
| 17 | |||||||||||||||||||||||||||||||||||
| 18 | 225 tiles of type 0 | ||||||||||||||||||||||||||||||||||
| 19 | |||||||||||||||||||||||||||||||||||
| 20 | |||||||||||||||||||||||||||||||||||
| 21 | 14 tiles of type 1 | 7 tiles of type 0 | 14 tiles of type 1 | ||||||||||||||||||||||||||||||||
| 22 | 14 tiles of type 4 | 1 | 5 tiles of type 0 | 1 | 14 tiles of type 4 | ||||||||||||||||||||||||||||||
| 23 | 14 tiles of type 9 | 4 | 1 | 3 t. of type 0 | 1 | 4 | 17 tiles... | ||||||||||||||||||||||||||||
| 24 | ...of type 9 | 4 t. of type 8 | 7 tiles of type 9 | 4 | 1 | 3 t. of type 0 | 1 | 4 | 7 tiles of type 9 | 4 t. of type 8 | 3 t. of type 9 | ||||||||||||||||||||||||
| 25 | 4 | 9 | 4 t. of type 8 | 9 | 6 t. of type 4 | 1 | 5 t. of type 0 | 1 | 6 t. of type 4 | 9 | 4 t. of type 8 | 9 | 4 | ||||||||||||||||||||||