YETI is a game engine developed and used by Ubisoft. The engine was originally developed by Ubisoft Tiwak and Paris studios for their critically acclaimed Xbox 360 version of Tom Clancy's Ghost Recon Advanced Warfighter. A heavily modified version of the engine is used in Tom Clancy's Ghost Recon: Future Soldier.
The engine features real-time dynamic shadows & dynamic lighting, normal mapping, a dynamic physics system, and a range of post-processing effects such as ambient occlusion, heat wave simulation, depth sprites and an enhanced particle system.