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Supporting Thousands of NPCs in 'Kingdom Come: Deliverance' & 'Kingdom Come: Deliverance II'
One of Kingdom Come: Deliverance's most prominent features is the deeply simulated open world. All the NPCs are doing their daily routines and reacting to player actions even when the player is long gone. Kingdom Come: Deliverance 2 not only quadruples the number of NPCs on the map to nearly 2400 but also concentrates around half of that into a single city. To keep the frame times and memory reasonably low, new techniques for the level of detail of the AI simulation had to be introduced, while making the scripting interface as oblivious to the LODs as possible. This talk describes the evolution of AI LOD solutions and optimizations through KCD and KCD2 from a technical point of view.
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