I'm doing an investigation for my AI class. I know of the big names like the Nemesis System in Shadow of Mordor or the Xenomorph in Alien Isolation, but I can't find a single document or post that explicitly lays out how their system (decision tree, neural network, etc) exactly works or is structured. Any ideas on what to read?

From what I'm aware of, any game or mod that advertises AI NPCs are just using ChatGPT and it's not very immersive since ChatGPT or any other LLM are also trained on a large amount of other data that has nothing to do with the games that uses them which unfortunately allows you to break the fourth wall very easily. They also have no reasoning and therefore will hallucinate, i.e: give unintentional false information, convincing you its real.

Most models are overly censored, at least the significantly larger models, furthermore these models, at least GPT, don't actively train on new data and you have a limited context window compared to the human brain meaning the more words (information) you send to the model, the more it will forget some of what you have sent which causes all kinds of problems like not recalling certain information, giving false information, etc.

AI voice generators have come a long way, but it can take several seconds or longer for a response and it still lacks emotion resulting in a boring monotone voice - the more you listen to AI voice generation, the more apparent it becomes.

There is also no relationship between the LLM and the actual NPC character, so they will say things that do not reflect reality due to their character being statically programmed and not implementing machine learning, I think this is the biggest problem and perhaps the most difficult to address.

Based on this, when you do think we will have advanced AI-powered immersive NPCs that essentially live and respond dynamically within the game world? The singularity of AI NPCs if you will.