Modding Whiplash/Fatal Racing

TRK file structure

The tracks.

Definition

Geometry length int	0	0	int
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Geometry
Signs
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Stunts
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Textures
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Race info
Empty line

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

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, clockwise (°) float

Pitch rotation, upwards (°) float

Roll rotation, 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

int

Left outer extra wall type? int

int

Right outer extra wall type? int

int

Environment floor type int

Sign type? int

int

int

float

float

float

Left outer upper extra wall angle? int

Left outer lower extra wall angle? int

int

int

Right outer lower extra wall angle? int

Right outer upper extra wall angle? int

Left outer upper extra wall height int

Left outer lower extra wall height int

int

int

Right outer lower extra wall height int

Right outer upper extra wall height int

int

int

int

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							Pit			Wall between track and shoulder	Transparent Requires no texture	Non-magnetic		Flip vertically	Non-solid	Texture pair				Flip horizontally				Apply texture	Texture

• Texture
  • Bit 0: some sort of offset?
    • For normal pair textures, left index+1 right index-3
    • For transparent, makes it darker?
  • Bits 1-7: pair index, first texture on left, second on right
    • 00000010 is first pair, 00000100 is second pair, etc

Sign type

Value	Name	Description
0	TOWER	tall box
1	TOWER 2	tall box, different texture
2	SIGN 1	small, back upside down, on one leg
3	SIGN 2	small, back upside down, on two legs
4	BUILD	complex building, drawn differently, different texture
5	BUILD 1	giant tall folded boxes, different texture
6	BUILD 2	giant tall box, different texture
7	BUILD 3	WIDE short box
8	HEELBAR	cube, different texture
9	BALLOON	flat square, always face camera
10	TREE	flat skinny rectangle, always face camera
11	ADVERT	flat small square, fixed, same back
12	ADVERT 2	fixed flat square, back upside down
13	QUAD BLD	4 tall skinny boxes
14	BLD 0	tall box with pyramid top, different texture
15	BIG BALL	flat square, always face camera, larger than BALLOON
16	BIG AD	fixed flat square, back upside down, smaller than ADVERT 2
>=256	no idea

Shoulder height

• >0: up
• 0: flat
• <0: down

AI line

• >0: left
• 0: center
• <0: right

Grip

• 0: full grip
• 12: ice

Surface type

• 524703 590082 590082 appears to define a moving ramp or at least a surface the car can fly off of vertically

Wall type?

• Left and right combine to determine ceiling

Outer lower/upper extra wall angle?

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

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

• Texture
  • Bit 0: unset is normal
  • Bits 1-7: index in BLD texture file
  • Bit 8: apply texture

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 texture file BLD:<DRH file>
BACKS:
int	int
...
	-1

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.