 The engine uses Autodesk's HumanIK middleware to correctly position the character's hands and feet in climbing and pushing animations at run-time.Anvil has been improved for "Assassin's Creed II".Features added include a full night and day cycle, enhanced draw distance, the same vegetation technology used in "Far Cry 2", improved lighting, reflection and special effects, new cloth system, and a new AI and NPC navigation system. ""