Modding Whiplash/Fatal Racing

TRK file structure

Definition

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

Geometry

Track geometry.

Left shoulder width int

Left lane width int

Right lane width int

Right shoulder width int

int

int

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

int

Right shoulder? grip int

int

int

int

int

int

Left surface type int

Center surface type int

Right surface type int

int

int

int

int

int

int

int

int

int

Sign type? int

int

int

float

float

float

int

int

int

int

int

int

int

int

int

int

int

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	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
Surface type							Pit				Transparent Requires no texture								Flip horizontally				Apply texture	Texture

• Texture
  • Bit 0: some sort of offset?
    • For normal 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

Values

• 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
• Sign type?
  • There are other values that apply signs or do other things
  • -1: none
  • 9: sign in center?

Signs

Empty on some tracks.

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

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