Flight-Tested and Fun-Tuned
0.4.0
22 July 2026
Vehicle Physics Kit
Released
Raycast-wheel vehicle physics for s&box: slip-curve tires, full drivetrain, assists and a chase camera. No art required.
Flight-Tested and Fun-Tuned
A changelist for Vehicle Physics Kit.
🎁 Added
- Opt-in per-car Sport dials on CarDefinition: SportTcSlipTarget and SportStabilityScale, so RWD cars can get their own Sport-mode traction and stability without touching Casual
- Air-attitude assist: AirPitchDampTau on VehicleController damps airborne pitch so cars land flat off jumps, and the handbrake bypasses it for deliberate flips
🧼 Improved
- Faster baseline: default PeakTorque 150 to 180 and RedlineRpm 6500 to 7800, about 20 percent more acceleration and top speed out of the box, hand-tuned per-car values are untouched
- Reverse is no longer a crawl: ReverseSpeedCap default goes 4.5 to 20 m/s, every assist audited at full reverse speed, stability damps reverse fishtails, and the gearbox still refuses to slam into forward until near-stopped
- Chassis colliders ship slick with friction 0.1, so a bottomed or landing chassis keeps its forward momentum instead of losing it to contact friction, tire grip stays the wheel model's job
🪛 Fixed
- Wheel visuals no longer sawtooth against the body on high-refresh displays, the suspension offset now rides the engine's fixed-tick interpolation exactly like the chassis
- A driven wheel that leaves the ground now freewheels instead of flaring to redline, no more engine scream over jumps, mid-air upshifts, or tall-gear landings
- Airborne wheels wind down at bearing-drag rates, they no longer arrive at half road speed after a flight and brake the car on touchdown
- The demo pad no longer mirrors ghostly white copies of the cars, it ships a matte material of its own
⚠️ Known Issues
- Traction control does not act in reverse, reverse wheelspin is bounded by the drive-side rev cap instead, a proper TC pass is on the roadmap