The AVC Project

The “Alien Virtual Car” project is a portable and fast C++ physics engine aimed at the realistic, real-time simulation of vehicle dynamics. Despite its name, the engine was written with versatility in mind and can be used to virtually build and simulate quite every type of wheeled ground vehicle (and not just cars).



Classes representing real-life components (tyres, suspensions, wings, differentials, engines) can be connected toghether in any number or order, allowing for the simulation of different types of vehicles.

Advanced Tyre Model

Custom QFE (Quasi-Finite Element) tyre model: tyre body is split into a finite number of narrow “bristles”, no more “magic formulas” or precomputed curves, tyre can naturally deflect and deform and fully simulate transient states and combined lateral/longitudinal slip conditions.


4-ways dampers, slick tyres, wings, locking differentials: AVC supports racing components (as well as “standard” ones), so that it’s possible to accurately simulate the physics of real-life motorsport.


Wings and aerodynamics appendices are accurately simulated, including secondary effects such as air speed (windy conditions) or loss of downforce and wake turbulence on the following car.


Not just road but also off-road conditions can be simulated, thanks to the terramechanics module; soil deformation, compaction, shear stress and its interaction wiht the QFE tyre model are accurately reproduced by AVC.


Devices equipping modern vehicles (such as ABS, ESP, traction control, engine mappings, energy recovery systems and so on) are fully supported; internal algorithms are parameterized and can be fine-tuned to suit a particular vehicle behaviour.

The VGP3 Engine

VGP3 engine logoBuilt on top of AVC, VGP3 adds all the technologies required to transform the dynamics engine into a full-featured car racing game/simulator that can be installed on modern consumer hardware (PC or Mac). Such technologies include:

A3e 3d engine:  a visualization module, OpenGL-based, offering realistic sun/sky/cloud rendering (Rayleigh and Mie scattering), physically based lighting model, postprocessing effects (such as motion blur or full screen anti aliasing) and support for true 3d stereoscopic vision

Artificial Intelligence module: the VGP3 AI is really advanced; it can drive almost any “reasonable” AVC vehicle; it can find by itself how to drive a particular vehicle fast (track best line, braking points); it’s a real challenge for human drivers, as it’s able to prevent collisions, if possible, in clever ways, maybe transforming a dangerous manouvre of a human driver into an overtaking opportunity

ANL library: a robust networking library with advanced prediction and lag-compensation algorithms, allowing for challenging multiplayer races and fierce tyre-to-tyre fights

Screenshots and Video

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AVC (VGP3 Engine) in action: a simulation of a Porsche 997 GT3 on the “Enzo and Dino Ferrari” track (Imola, Italy, old layout).


(Under construction)