Check2.bin

Introduction[]

check2.bin file stores checkpoints and connections on which AI can move.

Check2.bin can be imported with hdmaster's L3SD plugin for 3ds Max.

On the picture you can see a detail of the Africa1 grid. The yellow points show the human navigation grid and the green ones for vehicles.

Structure[]

File consists of a header and two sections; one for soldier checkpoints (abbreviated below as CP) and one for vehicle CP's.
Each new section begins with 0901 D07E.

Section 1 header

CP 1 ID-0

CP 2 ID-1

CP N ID(N-1)

CP label

objects

Section 2 header

CP 1

CP 2

CP N

CP label

Section header[]

0901 D07E
32-Bit INT	bytecount section
32-Bit INT	number of checkpoints
32-Bit INT	number of connections
32-Bit INT	number of labeled checkpoints
32-Bit INT	unknown	always 0000 0000
32-Bit INT	number of objects	for vehicle section always 0

Checkpoints[]

Each CP has following attributes.

Offset	Value	Meaning	Info
0	32-Bit FLOAT	location X	F000 A4C2 (=-82)
4	32-Bit FLOAT	location Y	2872 593F
8	32-Bit FLOAT	location Z	D810 89C0
12	32-Bit INT (+/-)	x-Axis dependence	F2FF FFFF, 0100 0000, 0200 0000, FFFF FFFF, ... depends on x coordinate. If x=5.6 -> 5, x=-4.3 -> -5, ...
16	16-Bit INT	Unknown 16	0, 1, 2, n - height level
18	8-Bit INT	Unknown 18	mainly 64, for Vehicles often 0
19	8-Bit INT	Unknown 19	e.g 20: 2m radius, means soldiers get in stance 2m before reaching CP
20	8-Bit INT	Amount of connections	04 (=4) only first 4 bytes and last 2 bytes are read. eg: 00100101 = 2⁰+2²+2⁵=5
21	8-Bit INT	Unknown 21	often 0, other values: -128, 1, 8
22	8-Bit INT	AI command	01: Door between CPs, 03: ladder between CPs, 04: climbing, 07:crouch, 08:lie, 11: Mg, 0: normal, 10: shooting from covered area (behind wall/window), 15: underwater/swimming, 5,6: Jumping from higher ground (5 higher position), Unknown: 12 (Burgundy1)
23	8-Bit INT	Unknown 23	-
24	8-Bit INT	Unknown 24	-
25	8-Bit INT	Unknown 25	- RGB Color?
26	8-Bit INT	Unknown 26	always 00
27	8-Bit INT	Unknown 27	- for vehicles always FF(-1)
28	8-Bit INT	Unknown 28	- for vehicles always FF(-1)
29	8-Bit INT	Unknown 29	- for vehicles always FF(-1)
30	8-Bit INT	Unknown 30	- for vehicles always FF(-1)
31	8-Bit INT	Unknown 31	for Soldier 0, for Vehicles -51,0
32	16-Bit INT	checkpoint ID which the checkpoint is connected to	0400 (= Checkpoint no. 4)
34	16-Bit INT	length of distance between the connected checkpoints	Calculation: see below

Addition to the last 16-Bit values: Depends on the number of connections. If e.g 2 connection we have 4 x 16-Bit INT. 2 x 16-Bit INT for each connection.

Calculation of distance between two checkpoints:

dx = cp2.x - cp1.x
dy = cp2.y - cp1.y
dz = cp2.z - cp1.z
distance_factor = 1.0 - ((cp2.Unk18 + cp1.Unk18) * 0.0009765625)
distance = sqrt(dx * dx + dy * dy + dz * dz)

result = short(distance * distance_factor * 256.0)

Labeled Checkpoints[]

After the list of checkpoints you can label any checkpoints needed for usage in script files.

16-Bit INT	Checkpoint ID
STRING	label
remain	Each labeled checkpoint consists of 18 bytes, unused space is filled up with 0.

Linked Objects[]

After the label part, objects (doors, ladders, barriers) are linked to certain checkpoints. These objects must be existent in the .bin files! Mention to link both relevant CPs to the object. In case of a door it's a CP directly before and one behind the door.
First comes again a 16-Bit INT for the checkpoint ID, followed by the object name. At the end there's an 8-Bit INT (0) to mark the end of the name.
If you done it correctly the AI should notice the object now and use it in the appropriated way.