Nan, je déconne sur Emergence Day, comme tu t´en doutais. Alors ça gère la physique, dont les véhicules, mais il n´y a pas des masses de précisions sur les objets normaux, ça a l´air pas mal du tout, ça dit ça :
Physics
Rigid body physics system supporting player interaction with physical game object, ragdoll character animation, complex vehicles, and dismemberable objects.
All renderable materials have physical properties such as friction.
Physics-driven sound.
Fully integrated support for physics-based vehicles, including player control, AI, and networking.
UnrealPhAT, the Visual physics modeling tool built into UnrealEd that supports creation of optimized collision primitives for models and skeletal animated meshes; constraint editing; and interactive physics simulation and tweaking in-editor.