@adatechnology/game-vehicles-driving

Driving for vehicles, without three.js and without a game. The arcade driver is the car of the game, extracted: a pure step over a state, with every number an option.

import { createArcadeDriver, vehicleCorners } from '@adatechnology/game-vehicles-driving'

const driver = createArcadeDriver({ maxForward: 20 })
driver.place(0, 0, 0)
const world = {
  blocked: (x, z, yaw) => vehicleCorners(driver.spec, x, z, yaw).some(([a, b]) => isSolid(a, b)),
  bodies: () => zombies.map((z) => (z.alive ? z : undefined)),
}
const { state, events } = driver.step({ throttle: 1, brake: 0, steer: 0, handbrake: false }, dt, world)
// events: crash, noise (crash, engine, horn), run_over (kill, knock, push), horn

The driver never touches a game: the host applies damage, shakes the camera, kills the bodies and plays the sounds from the events. Tested against the game's own carUpdate cut from jogo.js (positions and events frame by frame).

Semi-simulation

createSemiSimDriver(spec) is the driving the Frota document asks for: a single rigid body with a low centre of mass, a spring and damper on each wheel measured against the ground under it (world.ground(x, z)), longitudinal and lateral tyre forces apart inside a friction circle, an automatic gearbox with a simulated RPM, a handbrake that locks the rear wheels, surfaces (dry_asphalt 1.0, wet_asphalt 0.75 with aquaplaning above 90 km/h, dirt 0.65, grass 0.55, mud 0.4 that bogs a vehicle without four-wheel drive, blood 0.5) and damage that changes how it drives (driver.condition: a flat tyre pulls to its side, a damaged suspension rolls more, an engine under 30% fails at full throttle and can die uphill). Fuel use follows the RPM, the cargo and the engine (up to +40% when wrecked). semiSpecFromStats builds a spec from the design ratings; impactEnergy, bodyDamage, vehicleDamageFromImpact and speedLoss are the run-over formulas of section 08. There is no team code for it: the document's numbers are the tests, and no golden is claimed.