En tout cas dans stalker c´est pas ça :
Physics:
* Based on ODE engine
* Simulation speed outperforms commercial engines such as MathEngine, Havok, etc.
* Real-time IK, vehicle physics, etc.
* Collision database with low memory usage
* Collision detection optimized for a large number of queries in a high concentration polygonal environment
* Realistic simulation of ballistics, movement, and fluids
Ils disent que c´est un genre de Havok