NVIDIA's PhysX is a scalable multi-platform game physics solution, that has been used in many of today's popular games. In addition to the native physics engine of CRYENGINE (CryPhysics), this feature allow CRYENGINE users to use the Nvidia's third party physics engine (PhysX) as an external physics engine within the CRYENGINE.
The integration of Nvidia's PhysX is minimal-inversive. Basically, the CryPhysics interface IPhysicalWorld has been implemented for PhysX to replace the physics engine. The PhysX interface-code can be found in ../Code/CryEngine/CryPhysicsSystem/CryPhysX/. The interface can be compiled using CMake and WAF build systems.
By using Nvidia's PhysX, there is a possibility of using Nvidia's PhysX Visual Debugger (PVD). This allows recording and exploring of the game world's physics which might be very useful. You can also use basic visual debugging features available directly within CRYENGINE through p_draw_helpers command in the console.
Follow the below mentioned steps to install and enable PhysX in CRYENGINE:
p_physics_library = "CryPhysX"
e_OnDemandPhysics = 0
e_onDemandMaxSize = 999999
p_draw_helpers_num = 0
Comment and examples
|g_MaxSimpleCollisions||Used to cap the amount of rigidbody collision events per frame.|
Works only when g_DisableCollisionDaamage is active (otherwise game-important collisions might be missed).
This CVar is useful for profiling, since otherwise the costs of collision event processing can overwhelm the cost of the simulation, especially since it happens synchronously in the main thread.
|p_draw_helpers||Supports limited subset of CryPhysics helpers.|
Any non-0 enables PhysX helpers
|p_draw_helpers_num||Specifies bitwise, numerical version of p_draw_helpers (see above).|
|p_physics_library||Sets the physics.dll in system.cfg.||"CryPhysX" for PhysX, "CryPhysics" for CryPhysics.|
Nvidia's PhysX does not support dynamic concave objects (in contrast to CryPhysics). The existing concave proxies (for example, vehicles) are not added to the physics world. Therefore, the proxies must be adapted to convex to behave correctly.
The PhysX-interface is a beta feature at the moment. Currently, not all features of the CryPhysics are supported in the moment. There are few limitations which are outlined below:
As this is a Beta Feature, it is still in development and we would love to hear what you think about it. Please provide us with any feedback you have through the CRYENGINE Community forum!