Rigs of Rods, or RoR, is based on a specific soft-body physics engine called Beam. Beam simulates a network of interconnected nodes (forming the chassis and the wheels) and gives the ability to simulate deformable objects. With this engine, trucks flex and deform as you ride the terrain, which is based on real terrain elevation data. Crashing into walls or terrain can permanently deform a vehicle in a very realistic manner. The current version of the game, 0.35, contains trucks, cars, boats, loads, and a plane, all of which are simulated to amazing accuracy, including air dynamics for the plane and water resistance for the boat. The flight model is actually more complex and realistic than Microsoft Flight Simulator because of the calculation of lift based on the model's shape, and the wing flex caused by the soft-body physics engine. The game is constantly being updated by its developer, and new content is continually produced by the growing community.