Game.dtz

GAME.DTZ (DaTa Zlib) is a file in PS2 and PSP versions of GTA LCS and GTA VCS. It contains data files, as well as main textures and models analogue to existing 3D era games compiled in binary form. It is compressed using the zlib/deflate algorithm [1] (max compression). Its contents can be viewed using any zlib compression/decompression utility, such as offzip [2] and zdrop, though some can be viewed with DTZ Editor [3], a tool made by Dageron. All info provided is about decompressed version

Header

The Header for both GTA LCS and GTA VCS versions is defined like so:

0x0   [4b] "GTAG" signature
0x4   [4b] 1, unknown
0x8   [4b] size of decompressed file
0xC   [4b] ?
0x10  [4b] offset to global table of offsets 
0x14  [4b] number of offsets in global table
0x18  [4b] same as 0xC
0x1C  [2b] ?
0x1E  [2b] ?

Table of Analogy

Needs some serious editing

Description	Analogy	Offset	Notes
Textures
textures of menu	frontend.txd	LCS PS2: 0x4E4A30 LCS PSP: 0x4DA830 VCS PS2: 0x581330 VCS PSP: 0x51D95C	contain texture of menu, packed deflate/zlib algorithm (*)
texture of fonts	fonts.txd	LCS PS2: 0x4EF4D8 LCS PSP: 0x4E2B1C VCS PS2: 0x57BE4C VCS PSP: 0x530AFC	also packed deflate/zlib algorithm (*)
particle effects	particle.txd	LCS PS2: 0x4A1C28 LCS PSP: 0x38AB90 VCS PS2: 0x761F0 VCS PSP: 0x3F7FB0	contain all textures of particle effect (*)
generic-textures	generic.txd, wheels.txd, vehicle.txd	LCS PS2: 0x4A1BFC LCS PSP: 0x392B04 VCS PS2: 0x539E0 VCS PSP: 0x3D60B4	contains general textures for cars and all the textures of wheels (*)
radar icons	hud.txd	LCS PS2: 0x4A1BE4 LCS PSP: 0x38AD30 VCS PS2: 0x287B0 VCS PSP: 0x3B4678	contain icons for hud (*)
texture of radar	radarNN.txd		Contain textures for radar
Animation
?	ped.ifp
?	swim.ifp		only in GTA VCS
?	fight.ifp		only in GTA VCS
?	driveby.ifp		only in GTA VCS
DIR-files
for cuts.img	cuts.dir		not working
for GTA3PS2.IMG	GTA3PS2.dir		specific for stories, doesn't contain the names.
Collision
?	peds.col		peds.col2
?	vehicles.col		vehicles.col2
?	weapons.col		weapons.col2
Models
model of plane	air_vlo.dff		air_vlo.mdl
model of arrow	arrow.dff		arrow.mdl
model of wheels	wheels.dff
model of marker (zone)	zonecylb.dff
IDE / IPL / DAT
IDE	*.ide		contain all name of models and textures.
IPL	*.ipl		contains all the coordinates for the placement of collisions in the game.
colors of cars	carcols.dat
cullzone data	cullzone.dat
fistfite data	fistfite.dat
handling data	handling.dat	LCS PS2: 0x1647A0 LCS PSP: 0x50190 VCS PS2: 0x4C2A10 VCS PSP: 0x3AF30F	LCS and VCS have different structure of handling
	info.zon
	map.zon
object data	object.dat
particle data	particle.cfg	LCS PS2: 0x3917D0	characteristics of special effects
pedstats data	pedstats.dat	LCS PS2: part 1 - 0x49E820 part 2 - 0x49EB78 part 3 - 0x4A1A10 LCS PSP: 0x391DA0 VCS PS2: part 1 - 0x4C8080 part 2 - 0x4C8428 VCS PSP: 0x3B1F10	characteristics of pedestrians, in the PS2-version split into parts LCS PS2: part 1 - 15 items part 2 - 18 items part 3 - 9 items LCS PSP: 42 items VCS PS2: part 1 - 6 items part 2 - 36 items VCS PSP: 42 items
timecyc data	timecyc.dat
data about waters surfaces	waterpro.dat
weapon data	weapon.dat	VCS PS2: 0x3D7530 VCS PSP: 0x2E8B60
Other
SDT-files.			only in PSP versions

Notes:

• Offset is specified for the unpacked game.dtz
• * - Data marked with (*) are opened by GTA Stories Texture Explorer.

Data Formats

IPL

IPL Info

The header of GAME.DTZ points to 5 IPL info tables: Buildings, Treadables, Dummys, EntryInfoNode and PtrNode. The first 3 are 16 bytes in size and are defined like so:

4b int Offset to IPL data
4b int  ?
4b int  Number of IPL lines
4b int  ?
16 char Name of IPL info (Buildings, Treadables, etc...)

Need more info on EntryInfoNode and PtrNode

IPL Structure

The IPL data is structured like so:

4b float m00
4b float m10
4b float m20
4b float Unk1
4b float m01
4b float m11
4b float m21
4b float Unk2
4b float m02
4b float m12
4b float m22
4b float Unk3
4b float Position-X
4b float Position-Y
4b float Position-Z
4b float Unk4
24b ?
2b int   Corresponding Model ID
6b ?

The IPL is basically a matrix:

[m00,  m01,  m02,  Position-X]
[m10,  m11,  m12,  Position-Y]
[m20,  m21,  m22,  Position-Z]
[unk1, unk2, unk3, unk4      ]

The bottom row is Leeds Engine stuff, not useful for generating IPL. They only matter in memory. Someone may provide more info

Generating IPL in text format

In order to calculate the original rotation values, this algorythm comes in handy:

float tr = m00 + m11 + m22

if (tr > 0) { 
  float S = sqrt(tr+1.0) * 2; // S=4*qw 
  qw = 0.25 * S;
  qx = (m21 - m12) / S;
  qy = (m02 - m20) / S; 
  qz = (m10 - m01) / S; 
} else if ((m00 > m11)&(m00 > m22)) { 
  float S = sqrt(1.0 + m00 - m11 - m22) * 2; // S=4*qx 
  qw = (m21 - m12) / S;
  qx = 0.25 * S;
  qy = (m01 + m10) / S; 
  qz = (m02 + m20) / S; 
} else if (m11 > m22) { 
  float S = sqrt(1.0 + m11 - m00 - m22) * 2; // S=4*qy
  qw = (m02 - m20) / S;
  qx = (m01 + m10) / S; 
  qy = 0.25 * S;
  qz = (m12 + m21) / S; 
} else { 
  float S = sqrt(1.0 + m22 - m00 - m11) * 2; // S=4*qz
  qw = (m10 - m01) / S;
  qx = (m02 + m20) / S;
  qy = (m12 + m21) / S;
  qz = 0.25 * S;
}

And finally, since 3DS Max that originally created IPL negates X,Y,Z:

Rotation X = -qx
Rotation Y = -qy
Rotation Z = -qz
Rotation W = qw

IDE

On both LCS and VCS, 0x3C points to a table containing offsets to IDE lines and 0x38 specifies the number of values in the table. Each value-offset is assigned an ID, starting from 0. If it so happens and the value-offset is 0x00000000, then the ID isn't assigned to any object. The structure is like so:

LCS

8b -
4b int Name of the object (CRC32 Hash encryption)
4b -
1b int Type (1: objs, 3:tobj, 4:weap, 5:hier, 6:cars, 7:ped)
1b int Count 2dfx (ex. if 2dfxID=8 and Count2dfx=4, then the assigned IDs are 8, 9, 10, 11)
1b int Collision in .DTZ (boolean, 0:not in DTZ, 1:in DTZ)
1b -   Padding
4b int offset to collision (.col2)
2b int 2dfx ID
2b int Object.DAT ID
2b -
2b int Texture ID
4b int Type (CRC32 Hash encryprion)
4b int offset to model (if no .mdl exists in .DTZ, then it's 0)

Type 1 OBJS:

4b float Draw Distance 1
4b float Draw Distance 2
4b float Draw Distance 3 (if object is LOD, then disappearing distance)
1b int   Mesh Count
1b int   ?
2b int   Flags
4b int   if object is LOD, offset to IDE ID of original object, otherwise =0

Type 3 TOBJ:

4b float Draw Distance 1
4b float Draw Distance 2
4b float Draw Distance 3 (if object is LOD, then disappearing distance)
1b int   Mesh Count
1b int   ?
2b int   Flags
4b int   if object is LOD, offset to IDE ID of original object, otherwise =0
4b int   Time On
4b int   Time Off

Type 4 WEAP:

4b float Draw Distance 1
4b float Draw Distance 2
4b float Draw Distance 3 (if object is LOD, then disappearing distance)
1b int   Mesh Count
1b int   ?
2b int   Flags
4b int   Weapon.DAT ID
4b int   Animation ID

VCS

8b -
4b int Name of the object (CRC32 Hash encryption)
4b -
1b int Type (1: objs, 3:tobj, 4:weap, 5:hier, 6:cars, 7:ped)
1b int Count 2dfx (ex. if 2dfxID=8 and Count2dfx=4, then the assigned IDs are 8, 9, 10, 11)
1b int Collision in .DTZ (boolean, 0:not in DTZ, 1:in DTZ)
1b -   Padding
4b int offset to collision (.col2)
2b int 2dfx ID
2b int Object.DAT ID
2b -
2b int Texture ID
2b ?
2b -
4b int Type (CRC32 Hash encryprion)
4b int offset to model (if no .mdl exists in .DTZ, then it's 0)

Type 1 OBJS:

4b float Draw Distance 1
4b float Draw Distance 2
4b float Draw Distance 3 (if object is LOD, then disappearing distance)
1b int   Mesh Count
1b int   ?
2b int   Flags
4b int   if object is LOD, offset to IDE ID of original object, otherwise =0

Type 3 TOBJ:

4b float Draw Distance 1
4b float Draw Distance 2
4b float Draw Distance 3 (if object is LOD, then disappearing distance)
1b int   Mesh Count
1b int   ?
2b int   Flags
4b int   if object is LOD, offset to IDE ID of original object, otherwise =0
4b int   Time On
4b int   Time Off

More info soon

2DFX

2DFX data is read directly from DTZ header. Each line is 64 bytes (depending on the 2DFX type, padding is used at the end). 24 bytes are common for all types (only 0, 1 and 3 are used). Each line is assigned an ID, counting from 0.

4b float Position X (relative to centre of the object) (CVuVector)
4b float Position Y (relative to centre of the object) (CVuVector)
4b float Position Z (relative to centre of the object) (CVuVector)
4b float 0.0                                           (CVuVector)
1b int   Colour R
1b int   Colour G
1b int   Colour B
1b int   Unknown (usually 200.0, like in Vice City)
4b int   Type

Type 0 Lights:

4b float View Distance
4b float Outer Range
4b float Size
4b float Inner Range
1b int   Flash
1b int   Wet
1b int   Flare
1b int   Shadow Intensity
4b int   Flags
4b int   Offset to corona texture
4b int   Offset to shadow texture
8b -     Padding

Type 1 Particles:

4b int   Particle Type
4b float Strength X
4b float Strength Y
4b float Strength Z
4b float Scale
20b -    Padding

Type 2 Peds investigate:

4b float ?
4b float ?
4b float ?
1b int   ?
1b int   ?
26b -    Padding

Type 3 Peds:

4b float Rotation X
4b float Rotation Y
4b float Rotation Z
4b float Rotation X (again)
4b float Rotation Y (again)
4b float Rotation Z (again)
4b int   Behaviour
12b -    Padding

The format is the same as the plain text version of III and VC. More info can be found on: 2DFX

OBJECT.DAT

It's read directly from DTZ header. Each line is given an ID counting from 0.

LCS

116 entries

4b float B Mass
4b float C TurnMass
4b float D Air Resistance
4b float E Elasticity
4b float F Bouyance
4b float G Uproot Limit
4b float H Collision Damage Multiplier
1b int   I Collision Damage Effect
1b int   J Special Collision Response Cases
1b int   K Camera to avoid this object
1b -     Padding

VCS

140 entries

4b float B Mass
4b float C TurnMass
4b float D Air Resistance
4b float E Elasticity
4b float F Bouyance
4b float G Uproot Limit
4b float H Collision Damage Multiplier
1b int   ?
1b int   ? (J Special Collision Response Cases?)
1b int   ? (K Camera to avoid this object?)
1b int   ?
1b int   ?
3b -     Padding

PEDSTATS.DAT

The GAME.DTZ header redirects to a table which contains 4byte values, each one being an offset to each PEDSTATS.DAT line. Each line is defined as so:

VCS

4b int     ID
4b float B Flee Distance
4b float C Heading Change Rate
4b float H Attack Strength
4b float I Attack Weakness
2b int   J Flags
1b int   D Fear
1b int   E Temper
1b int   F Lawfulness
1b int   G Sexiness
26b char A Name

PARTICLE.CFG

VCS

4b int      ID
20b int  A  Name
4b float CR Create Range
4b float E  Default Initial Radius
4b float F  Expansion Rate
2b int   H  Fade Time
2b int   G  Initial Intensity
2b int   I  Fade Amount
2b int   GA Initial Intensity
2b int   HA Fade Time
2b int   IA Fade Amount	
1b int   K  Start Animation Frame
1b int   L  Final Anim Frame
1b int   J  Anim Speed
1b -        Padding
4b int   M  Rotation Speed
4b float N  Gravitational Acceleration
4b int   O  Friction Decceleration
4b int   P  Default Life Span
4b float Q  Position Random Error
4b float R  Velocity Random Error	
4b float S  Expansion Rate Error
4b int   T  Rotation Rate Error
4b int   U  Life Soan Error Shape
4b float V  Trail Length Multiplier
4b int   Z  Flags
1b int   B  Render Colouring R
1b int   C  Render Colouring G
1b int   D  Render Colouring B
1b -        Padding
4b int   CV Initial Color Variation
1b int   B2 Fade Destination Colour R
1b int   C2 Fade Destination Colour G
1b int   D2 Fade Destination Colour B
1b -        Padding
4b int   FT Colour Fade Time
4b float WX x-axis Stretch Value
4b float WY y-axis Stretch Value
4b float WI Wind Factor	
4b ?        ?
4b ?        ?

weapons data

Analog of weapons.dat

Structure of LCS version

Total number of records: 38

typedef struct vFireOffset{
    float       x;
    float       y;  
    float       z;        
};

typedef struct vTimeStrc{
    float       a;
    float       b;  
    float       c;        
};

typedef struct weapondata{
    int		FireType;
    float	Range;
    int		FiringRate;
    int		Reload;
    int		AmountOfAmmunition;
    int		Damage;
    float	Speed;
    float	Radius;
    float	LifeSpan;
    float	Spread;
    DWORD	padding1;
    DWORD	padding2;
    vFireOffset	FireOffset;
    DWORD	zero;
    DWORD	anim_id;
    vTimeStrc	time1;
    vTimeStrc	time2;
    float	unk;
    DWORD	ModelID;
    DWORD	ModelID2;
    DWORD	weapon_slot;
    DWORD	Flags <format=hex>;
};

Structure of VCS version

Total number of records: 40

typedef struct vFireOffset{
    float       f1;
    float       f2;  
    float       f3;        
};

typedef struct weapondata{
    DWORD       dwType; 
    int         iFireType;
    float       fRange;
    int         iFiringRate;
    int         iReload;
    int         iAmountOfAmmunition;
    int         iDamage;
    float       fSpeed;
    float       fRadius;
    float       fLifeSpan;
    float       fSpread;
    DWORD       dwPadding;   //padding (0xAA)
    vFireOffset m_vFireOffset;  //vector
    DWORD       _f3C;   //always zero
    DWORD       _f40;   //integer value
    DWORD       _f44;   //DWORD ? unknown
    vFireOffset m_vFireOffset;  //vector
    vFireOffset m_vFireOffset;  //vector
    DWORD       dwModelID; 
    DWORD       dwModel2ID;
    DWORD       dwWeaponSlot
    DWORD       _f6C;   //padding (0xAA)      
};

handling data

VCS

HANDLING.CFG data is read from the IDE section of each vehicle. There are 6 types of handling (to be found). Type 1 (or the common one) is presented. This is very likely to be wrong :) Need help!

4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float ?
4b float TransmissionData.fEngineInertia [0.0-50.0]
4b float ?
4b float ?
4b float ?
1b char  TransmissionData.nDriveType [F/R/4] - Front/Rear/4-wheel
1b char  TransmissionData.nEngineType [P/D/E] - Petrol/Diesel/Electric
1b int   TransmissionData.nNumberOfGears [1-5]
1b int   Padding
4b float ?
4b float fBrakeBias
4b float fSteeringLock [10.0-40.0]
4b float fTractionLoss [0.0>x>1.0])
4b float fTractionBias
4b float fSuspensionForceLevel
4b float fSuspensionDampingLevel
4b float suspension upper limit
4b float suspension lower limit
4b float suspension bias between front and rear
4b float suspension anti-dive multiplier
4b float fSeatOffsetDistance
4b int   nMonetaryValue
1b int   front lights (0:long, 1:small, 2:big, 3:tall)
1b int   rear lights (0:long, 1:small, 2:big, 3:tall)
2b int   Padding
4b float fDragMult
4b float ? (=0)
4b float CentreOfMass.x (CVuVector X)
4b float CentreOfMass.y (CVuVector Y)
4b float CentreOfMass.z (CVuVector Z)
4b float -              (CVuVector W)
4b int   nPercentSubmerged [10-120]
4b float ?
4b float TransmissionData.fMaxVelocity
4b float fMass
4b float fTurnMass
4b float fTractionMultiplier
4b float ?
4b int   ? (modelFlags)
4b int   ?
12b -

Sources

http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToQuaternion/index.htm