OBD:AKVA/0x24: Difference between revisions

Revision as of 01:37, 25 January 2007

AKVA : BNV Node Array

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Overview @ Oni Stuff

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):

Taken from EXE (pointer array at 0x134878 in the 1527808-byte EXE)

There's another pointer array at 0x1348A0 in the 1527808-byte EXE that goes:

Apparently a separate type, but possibly complementary to the one above.

SFeLi, please help ^^

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)

Here's the grid this corresponds to: (the grid's size is 26x35 as specified in the DAT)

@@ Line 15: / Line 15: @@
 Tile types are (appearance as visible with '''ai2_showgrids=1'''):
-*0 : no cross, clear
+*0 : no cross, '''clear'''
-*1 : light green cross, near wall
+*1 : light green cross, '''nearwall'''
-*2 : lightest blue cross, border 1
+*2 : lightest blue cross, '''border1'''
-*3 : lighter blue cross, border 2
+*3 : lighter blue cross, '''border2'''
-*4 : green cross, semipassable
+*4 : green cross, '''semipassable'''
-*5 : blue cross, border 3
+*5 : blue cross, '''border3'''
-*6 : dark blue cross, border 4
+*6 : dark blue cross, '''border4'''
-*7 : dark green cross, stairs
+*7 : dark green cross, '''stairs'''
-*8 : orange cross, danger
+*8 : orange cross, '''danger'''
-*9 : red cross, impassable
+*9 : red cross, '''impassable'''
-Taken from *.exe
+Taken from EXE (pointer array at 0x134878 in the 1527808-byte EXE)
+There's another pointer array at 0x1348A0 in the 1527808-byte EXE that goes:
+*0 : '''none'''
+*1 : '''floor'''
+*2 : '''wall'''
+*3 : '''sloped'''
+*4 : '''danger'''
+*5 : '''stair'''
+Apparently a separate type, but possibly complementary to the one above.
+*0x134878 is addressed from 0xB6745 (0xB675B links to "unknown-weight %d")
+*0x1348A0 is addressed from 0xB670D (0xB6723 links to "unknown-event %d")
+SFeLi, please help ^^
 Strips can be stored in two ways: