CULL

CULL (IPL section)

Short description:	Create a culling zone
Supported games:	GTA 3 GTA VC GTA SA GTA IV
IPL Sections: 2DFX • AUZO • BLOK • CARS • CULL • ENEX • GRGE INST • JUMP • LINK • LODM • MLO+ • MULT • OCCL PATH • PICK • RTFX • SLOW • TCYC • VNOD • ZONE

CULL is a section in the IPL file. It is used to create zones with different behaviour like mirrors ^[1] or fixed camera positions. It can also influence the environment like disable rain within the zone and certain police behaviors.

Format

GTA III and Vice City

Cull zones in GTA III and Vice City are built by a box which is controlled by various flags^[2]. By default, most of the cull zones are located in data\maps\cull.ipl for both games.

	Identifier	Type	Description
A,B,C	CenterX, CenterY, CenterZ	float[3]	A point which defines the center of the box in real world coordinates.
D,E,F	LowerLeftX, LowerLeftY, LowerLeftZ	float[3]	A point which corresponds to the lower left corner of the box.
G,H,I	UpperRightX, UpperRightY, UpperRightZ	float[3]	A point which corresponds to the upper right corner of the box.
J	Flags	integer	The behaviour of the cull zone – see below.
K	Unknown	integer	Always 0

Changing the zones center coordinates does not directly affect the zone itself. Anyway this vector should always point to the real center of the zone since those values are used to calculate the distance of several instances (e.g. the player) to the zone itself.

GTA San Andreas / IV

San Andreas has two different major formats in the game:

CenterX, CenterY, CenterZ, Unknown1, Length, Bottom, Width, Unknown2, Top, Flag, Unknown3

CenterX, CenterY, CenterZ, Unknown1, Length, Bottom, Width, Unknown2, Top, Flag, Vx, Vy, Vz, Cm

Coordinates are always rounded to the nearest world unit so that they are no longer floating point values, they are non-decimal integers.

Value	Description
CenterX, CenterY, CenterZ	Vector to the center of the cull zone.
Unknown1, Unknown2, Unknown3	Allways 0.
Length	Dimensions of the zone along y-axis.
Width	Dimensions of the zone along x-axis.
Top, Bottom	Absolute Z coordinate of the top and bottom of the box.
Flag	The behaviour of the cull zone – see below
Vx, Vy, Vz, Cm	Mirror parameters [4].

This section is incomplete. You can help by fixing and expanding it.

Flags

Flags are numbers which are build out of a collection of numbers formed by the power of 2-numbers lower than 2³⁰. Some are defining various behaviours of the zone. They can be combined by simply adding one flag value to another (see binary to decimal conversion).

Flag	Supported games	Binary	Description
-1	–	1111 1111 1111 1111	Enables all flags. [3]
1		0000 0000 0000 0001	Camera close in into player using closest third-person view camera mode, does not close in if in first person or cinematic mode, camera mode cannot be changed while in the zone
2		0000 0000 0000 0010	Camera remotely placed outside the zone, no control of camera, camera mode cannot be changed while in the zone
4		0000 0000 0000 0100	Lowers the camera angle on boats
8		0000 0000 0000 1000	Rain-free, police helicopter-free zone
16		0000 0000 0001 0000	Police will not exit their vehicles voluntarily. They will only exit if you do something to them (like shoot it). Cops both on foot and in vehicles will not chase you but can shoot at you.
256		0000 0001 0000 0000	Police will always exit their vehicles once they are spawned ONLY IF you have a wanted level. If you don't, they'll drive normally.
1024		0000 0010 0000 0000	Some visual ocean water effects are removed like the transparent waves and sparkles on the water
4096		0001 0000 0000 0000	5-Star Military zone.

This section is incomplete. You can help by fixing and expanding it.

References

• ^  GTAForums: 8 Track Screen
• ^  GTAForums: GTA VC cullzones deciphered
• ^ Two's complement
• ^  GTAForums: SA Mirrors

External links

•  GTAForums: Karma contest with cullzones as topic
•  GTAForums: IPL documentation topic