Agent based design and implementation of realistic social interaction environment between non-player characters in open world games

In recent years, digital Role-Playing Games (RPGs) have reached to a graphical realism level very close to the real world. As the Non-Player Characters (NPCs) in the game world are started to look realistic, players expect their behaviour to be realistic too. This expectation is high especially in the Open-World games that give the player an aspect to freely explore everything and don't limit the players' interactions. In this study, in order to create a more realistic game environment, a system design expressed by mathematical models was proposed; that provides knowledge transmission between NPCs, which forms the communities in Open-World RPGs. A small Open-World model was created using the Unity3d game engine, similar to the Open-World RPGs. The behaviors of NPCs are modeled with Agent Based Modeling (ABM) and an event generating player has been added to the system. With the different autonomy and socialness parameters that have been determined, the events produced by the player have been spread realistically on the society using information transmission system between the NPCs. This contributes to the formation of norms in the society in a natural way. By that way, it was observed that social learning emerged among NPCs and as a result of the information transfer, the agents were given the ability to learn with a mechanism such as Multi-Agent Systems (MAS) to update their views on concepts. In addition, with the proposed mathematical model, reputation of the player regarding to NPCs was examined. In order to check the accuracy of this Unity3d simulation model created, a console simulation consisting of the same number of NPCs with the same parameters was also run and the results were compared. The results show that the diffusion of knowledge and the formation of the norms largely depend on the game world design and population density. It is concluded that NPCs are also affected by the concepts of the event, the views of the society and the norms formed.