Modding Whiplash/Fatal Racing

TRK file structure

The tracks.

Definition

Header

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Empty line

Geometry

Signs

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Stunts

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Textures

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Race info

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• // denotes a single line comment
• integer values are 32-bit signed integers
• floating point values are double precision

Header

Geometry length int

0

0

Distance between track and floor int

Geometry

Track geometry.

Left shoulder width int

Left lane width int

Right lane width int

Right shoulder width int

Left shoulder height int

Right shoulder height int

Length int

Yaw rotation, counter-clockwise (°) float

Pitch rotation, upwards (°) float

Roll rotation, counter-clockwise (°) float

AI line int

AI line int

AI line int

AI line int

Track grip int

Left shoulder grip int

Right shoulder grip int

int

int

int

int

int

Left surface type int

Center surface type int

Right surface type int

Left wall type int

Right wall type int

Roof type int

Left upper outer wall type int

Left lower outer wall type int

Outer wall floor type? int

Right lower outer wall type int

Right upper outer wall type int

Environment floor type int

Building/Sign type int

Building/Sign horizontal offset int

Building/Sign vertical offset int

Building/Sign yaw, counter-clockwise (°) float

Building/Sign pitch, upwards (°) float

Building/Sign roll, counter-clockwise (°) float

Left upper outer wall angle? int

Left lower outer wall angle? int

int

int

Right lower outer wall angle? int

Right upper outer wall angle? int

Left upper outer wall height int

Left lower outer wall height int

int

int

Right lower outer wall height int

Right upper outer wall height int

Wall/roof height int

Draw order? int

Draw order? int

Draw order int

int

int

int

int

int

int

int

int

int

int

int

int

int

int

Empty line

...

Surface type bit flags

Least significant bit	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
Surface type	Wall (cannot be driven on)	Bounce off walls	Echo				Pit	Yellow on track map		Wall (cannot be driven on)	Transparent Requires no texture	Bounce off walls	Non-magnetic	Flip vertically	Non-solid	Texture pair				Flip horizontally		Partial transparency		Apply texture	Texture

• Partial transparency
  • Toggles transparency on textures that contain transparent sections, e.g. guardrail
  • Turns palette texture index 0 transparent (#000000) (not to be confused with the same color at another index)
• Texture
  • Transparent
    • Setting bit 0 makes it darker?
  • Single
    • Bits are just texture index
  • Pair
    • Bits are texture index of left, index+1 on right
  • When apply texture not set
    • Bits indicate a solid color corresponding to the index within PALETTE.PAL

These apply for road surface, wall/roof, and outer wall/floor.

Building/Sign type

Value	Name	Description	Requires apply bit?	Texturing
0	TOWER	tall box	Yes	Index
1	TOWER 2	tall box, different texture	No	Fixed (22)
2	SIGN 1	small, back upside down, on one leg	Yes, but not for legs	Index, legs fixed (20)
3	SIGN 2	small, back upside down, on two legs	Yes, but not for legs	Index, legs fixed (21)
4	BUILD	complex building, drawn differently, different texture	No	Fixed (20, 21)
5	BUILD 1	giant tall folded boxes, different texture	No	Fixed (0)
6	BUILD 2	more giant tall folded box, different texture	No	Fixed (20)
7	BUILD 3	WIDE short box	Yes	Index
8	HEELBAR	cube, different texture	No	Fixed (8)
9	BALLOON	flat square, always face camera	Yes	Index
10	TREE	flat skinny rectangle, always face camera	No	Fixed (1)
11	ADVERT	flat small square, fixed, same back	Yes	Index
12	ADVERT 2	fixed flat square, back upside down	Yes	Index
13	QUAD BLD	4 tall skinny boxes	No	Fixed (23, 24, 25, 26)
14	BLD 0	tall box with pyramid top, different texture	No	Fixed (20, 21)
15	BIG BALL	flat square, always face camera, larger than BALLOON	Yes	Index
16	BIG AD	fixed flat square, back upside down, smaller than ADVERT 2	Yes	Index
>=256	no idea

Textures are determined by BLD file.

• Index: first 9 bits work just like road textures
• Fixed: Same texture is always applied (index in parentheses)

Shoulder height

• >0: up
• 0: flat
• <0: down

AI line

• >0: left
• 0: center
• <0: right

Grip

• 0: full grip
• 12: ice

Wall type

• Left and right must exist to draw roof

Outer wall floor type?

• -2: outer walls even with shoulder, normal solid wall
• -1: no outer walls, can fall off
• >=0: texture indexing with 9 bits as usual, moves walls below track and applies to floor, can drive partially off shoulder and bounce off

Building/Sign offset

• >0: left/up
• 0: center
• <0: right/down

Outer lower/upper wall angle?

• Not the actual walls
• >0: outward
• 0: vertical

Draw order?

These three values seem to combine to determine whether track is visible through other track. For example, given Bonus 4 with a bunch of buildings/signs over transparent track with transparent track on the other side, when the third value is 0, no buildings/signs are visible. When said value is greater than 0, some buildings/signs are visible. Changing the value or the values of the other two may change which buildings/signs are visible.

Third row

These properties only ever have these values over all 11018 geometry segments of the retail tracks.

Property index	Values
16	20,40,60
17	20,40,60,80
18	20,40
19	20
20	20
21	20,40,60,80
22	1
23	20
24	1,20,40
25	20
26	1

Signs

Empty on some tracks.

Signable geometry index int	Texture int
...
-1	-1

• Signable geometry index
  • 0: first geometry section with 0 <= sign type < 256
  • 1: second, etc
• Texture
  • Bits 0-7: index in BLD texture file
  • Bit 8: apply texture
  • Bit 15: invisible
  • No other bits seem to have an effect

Stunts

Controls geometry that moves and potrudes. Empty on some tracks.

Geometry index int	Scale factor? int	Angle? int	? int	Timing group int	Height int	Time bulging int	Time flat int	Smaller expands/larger contracts? int	Bulge? int
...
-1

• Scale factor?
  • Increases the length and height of the "ramp"
  • 1 is a bump, 4 starts breaking textures, 6 is huge vertical wall
• Angle?
  • Lower is flatter, higher becomes trapezoid with longer top
•  ?
  • No clue
• Timing group
  • With otherwise identical config, two bumps with same number move together, with 1 and 2 move oppositely

Textures

Texture file TEX:<DRH file>
Building/Sign texture file BLD:<DRH file>
BACKS:
Geometry index int	Texture int
...
	-1

Backs

The outside texture of walls when there is a wall between the track and the shoulder. There must be some kind of flag as it is not always displayed.

Race info

Not present on some tracks.

Track number int
Impossible laps int	Hard laps int	Tricky laps int	Medium laps int	Easy laps int	Girlie laps int
Track map size, smaller is larger float	Track map fidelity, smaller is more accurate int	float

Effects

Bonus 7

• Swapping yaw and pitch: loop
• Swapping yaw and roll: twisting line
• Swapping yaw and pitch, roll 90.00000: vertical ring to the left
• Negative yaw: turnright

Length

Given Pulse at its maximum 193 mph on a modified Bonus 4 where all 494 sectors are 1200 long can complete at lap in 28.36 seconds and on the same track but with 50 flat sectors on each side shortened to 100 can complete a lap in 27.41 seconds, 1000 length units is equivalent to 13.45 ft or 4.10 m. Additionally, the rotated portions of the track contribute approximately 0.20 seconds extra compared to flat.