by lazybitgames

F-Gear Vehicle Physics

FGear is an advanced vehicle physics solution for Unity and Unreal. It's built for racing, drifting and offroading alike: cast-based or rigidbody wheels, three tire models and a drivetrain you can retune at runtime. From four-wheel cars to bikes, trucks and multi-axle vehicles, it covers the full range.

Get it on Unity Asset Store Get it on Unreal Marketplace

See it in action

Visit the youtube channel for tutorials and more.

Screenshots

Select an image to view it larger.

Core features

Everything you need for a driveable vehicle, in one component.

General

  • Desktop or mobile, full source code
  • Single vehicle component drives a complete vehicle
  • Adjustable substep rate
  • Mass, inertia scale, center-of-mass offset overrides; optional custom gravity vector
  • FWD/RWD/AWD driveline presets and arbitrary custom differential trees
  • Sleep system for optimization
  • Save/restore full vehicle state at runtime (rewind/replay)
  • JSON save/load of a whole vehicle setup for fast prototyping
  • Simplified Pacejka, Pacejka 96 and Magic Formula 6.1 tire models
  • Sticky tire mode (eliminates low speed issues of Pacejka models)
  • Tire pressure and tire wear
  • Shipped tire preset libraries across different families like street/track/drift etc.
  • Runtime per-wheel modification of all stats

Wheels & suspension

  • 3D wheel contact: multiple raycasts, longitudinal and lateral ray grids, sphere cast, convex mesh cast (configurable side count)
  • Raycast prediction, early-hit skipping, layer mask, trigger ignoring
  • Rigidbody wheel mode: the wheel becomes a real collider on a joint-driven hub, picking up tread, sidewall and rim contacts that casts cannot see
  • Tire deformation based on tire pressure and sidewall height
  • Spring/damper suspension with preload, up/down travel, compression limit; advanced mode with authored spring-rate and compression/relaxation damper curves
  • Geometry offsets: cast, spacer, forward, vertical, rim, suspension offset
  • Wheels can be deactivated at runtime

Drivetrain & axles

  • Torque curve based engine model
  • Engine stalling
  • Engine rev matching
  • Turbo simulation, with 5 preset configurations or custom setup
  • Turbo antilag
  • Clutch simulation with automatic mode
  • Clutch anti-stall assist
  • Auto / sequential / manual h-pattern transmissions
  • Open, locked, LSD, torsen, fixed-share and split-ratio differential types; chainable into center/axle trees
  • Differential-steer (tank/skid steer) mode
  • Ackerman steering with adjustable coefficient and reference wheel
  • Toe, camber (min/max), caster, kingpin
  • Solid-axle mode with articulation limit
  • Per-axle handbrake, brake and torque distribution, multi-wheel axles

Aero

  • Aerodynamic effects including drag and downforce from coefficients and air density, with front/rear downforce split

Input

  • StandardInput with keyboard, joystick, and wheel+shifter (h-pattern) support
  • Dual input backend: legacy Input Manager and the new Input System, with AUTO resolution and fallback
  • InputProfile system — all shared input settings live in one reusable asset with a runtime copy

Driving aids

  • ABS and ASR
  • Understeer and oversteer (ESP) assists
  • Steering assist for counter steering
  • Per-axle anti-roll bars
  • Reverse braking and hill holder
  • Idle drive assist

Collisions

  • Vehicle body physical material overrides
  • Vehicle body contact smoothing
  • Vehicle body deformation with allowed depth, deformation curve and elasticity
  • Generated wheel colliders with their own material (procedural cylinders)

Telemetry

  • In-game telemetry windows per subsystem
  • Geometry, hit-normal and tire-force gizmos
  • Custom inspectors with tooltip help for vehicle, tire models and input profile asset

Extras

Features used to build the demo scenes, included for you to reuse.

  • OrbitCamera3rd person camera with many options
  • AIControllerSpline-following AI driver with speed curve and look-ahead steering
  • CarManagerMulti-vehicle manager that features vehicle switching, rankings, countdown, reset/respawn with collision-off and flicker, muting others etc.
  • Effects
    • Surface types from physic materials or terrain
    • Procedural bumps
    • Procedural engine and turbo sound
    • Tire smoke and skidmarks (mesh generation and sound)
    • And many more
  • ForceFeedbackDirectInput forcefeedback sample (self-align, road vibration, constant friction, speed-scaled steering damper & collision force)
  • JoystickVibration needs XInputDotNetXInput sample (commented out)
  • GaugeUISpeedometer, traction, suspension, steering and g-sensor gauges
  • MinimapToolMinimap helper for spline-based minimap with vehicle markers
  • MobileInputControls the vehicle via UI buttons
  • ArcadeAssists
    • Understeer/oversteer recovery
    • Anti-roll bars
    • Yaw control assists
    • PID based cruise control
    • Pitch/roll air stabilizers
  • BikeHelperLean/roll control and wheelie/stoppie helpers
  • TireSwitcherRuntime tire-model picker, one dropdown per axle
  • StatisticsTracks and displays some stats (0-100, 0-200, 100-0 braking, drift angle/score/distance, lap times)
  • RewindReplayRing-buffer rewind and replay from VehicleState
  • RuntimeSampleVehicle built and modified entirely from script at runtime
  • NetworkSample / NetworkSync needs PUN2Multiplayer sample using projected velocity blending
  • PitchDecouplerKeeps chosen transforms (brake calipers etc.) from inheriting body pitch
  • SplineToolBezier path tool used by AI, minimap and lap timing
  • SkidmarkPooled skidmark mesh renderer
  • DebugChartsReal-time multi-channel plotting of some vehicle/wheel data

Questions, problems or suggestions?

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