Recent simulations include a soldier wearing a shock belt during a combat simulation. A "virtual" simulation used flight simulators. Geometry optimization is fundamentally different from a molecular dynamics simulation. These simulators range in purpose from pure simulation to sheer entertainment. Calibration plays a pivotal role in both CA and ABM simulation and modelling approaches. It is now known as The Society for Modeling and Simulation International. The engine uses Bullet for 3D physics simulation. Real-time control during physics simulation and rendering. It was the first popular application of machine learning in an interactive simulation. Anaesthesia personnel train for equipment failures using medical simulation techniques. Some research integrates computer simulation and organizational studies. It can be done with the help of computer simulation software. Weishampel developed his model with the aid of a computer simulation. There are lots of software commonly used for discrete event simulation. PhysX is a multi-threaded physics simulation SDK.