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This paper addresses the concurrency issues affecting Behavior Trees (BTs), a popular tool to model the behaviors of autonomous agents in the video game and the robotics industry. BT designers can easily build complex behaviors composing…

Robotics · Computer Science 2022-03-22 Michele Colledanchise , Lorenzo Natale

Procedural Content Generation via Reinforcement Learning (PCGRL) offers a method for training controllable level designer agents without the need for human datasets, using metrics that serve as proxies for level quality as rewards. Existing…

Artificial Intelligence · Computer Science 2025-10-07 Sam Earle , Zehua Jiang , Eugene Vinitsky , Julian Togelius

We introduce the concept of Procedural Content Generation via Knowledge Transformation (PCG-KT), a new lens and framework for characterizing PCG methods and approaches in which content generation is enabled by the process of knowledge…

Artificial Intelligence · Computer Science 2023-05-02 Anurag Sarkar , Matthew Guzdial , Sam Snodgrass , Adam Summerville , Tiago Machado , Gillian Smith

Procedural content generation via Machine Learning (PCGML) is the umbrella term for approaches that generate content for games via machine learning. One of the benefits of PCGML is that, unlike search or grammar-based PCG, it does not…

Artificial Intelligence · Computer Science 2018-09-26 Matthew Guzdial , Joshua Reno , Jonathan Chen , Gillian Smith , Mark Riedl

Procedural content generation via machine learning (PCGML) is the process of procedurally generating game content using models trained on existing game content. PCGML methods can struggle to capture the true variance present in underlying…

Machine Learning · Computer Science 2021-07-28 Bowei Li , Ruohan Chen , Yuqing Xue , Ricky Wang , Wenwen Li , Matthew Guzdial

We propose a design for a functional programming language for autonomous agents, built off the ideas and motivations of Behavior Trees (BTs). BTs are a popular model for designing agents behavior in robotics and AI. However, as their growth…

Programming Languages · Computer Science 2024-12-13 Oliver Biggar , Iman Shames

In this work, we propose an LLM-based BT generation framework to leverage the strengths of both for sequential manipulation planning. To enable human-robot collaborative task planning and enhance intuitive robot programming by nonexperts,…

Robotics · Computer Science 2024-09-17 Jicong Ao , Yansong Wu , Fan Wu , Sami Haddadin

Behavior Trees (BTs) are becoming a popular tool to model the behaviors of autonomous agents in the computer game and the robotics industry. One of the key advantages of BTs lies in their composability, where complex behaviors can be built…

Robotics · Computer Science 2020-07-16 Michele Colledanchise , Lorenzo Natale

As complex autonomous robotic systems become more widespread, the need for transparent and reusable Artificial Intelligence (AI) designs becomes more apparent. In this paper we analyse how the principles behind Behavior Trees (BTs), an…

Artificial Intelligence · Computer Science 2021-05-26 Oliver Biggar , Mohammad Zamani , Iman Shames

Behavior Trees (BTs) provide a lean set of control flow elements that are easily composable in a modular tree structure. They are well established for modeling the high-level behavior of non-player characters in computer games and recently…

Behavior Trees (BTs) have found a widespread adoption in robotics due to appealing features, their ease of use as a conceptual model of control policies and the availability of software tooling for BT-based design of control software.…

Robotics · Computer Science 2025-04-11 Enrico Ghiorzi , Christian Henkel , Matteo Palmas , Michaela Klauck , Armando Tacchella

Procedural content generation in video games has a long history. Existing procedural content generation methods, such as search-based, solver-based, rule-based and grammar-based methods have been applied to various content types such as…

Artificial Intelligence · Computer Science 2020-10-12 Jialin Liu , Sam Snodgrass , Ahmed Khalifa , Sebastian Risi , Georgios N. Yannakakis , Julian Togelius

There is a growing interest in Behavior Trees (BTs) as a tool to describe and implement robot behaviors. BTs were devised in the video game industry and their adoption in robotics resulted in the development of ad-hoc libraries to design…

Robotics · Computer Science 2022-06-29 Michele Colledanchise , Lorenzo Natale

Behavior Trees are a task switching policy representation that can grant reactiveness and fault tolerance. Moreover, because of their structure and modularity, a variety of methods can be used to generate them automatically. In this short…

Robotics · Computer Science 2023-01-18 Matteo Iovino , Christian Smith

Autonomous robots combine a variety of skills to form increasingly complex behaviors called missions. While the skills are often programmed at a relatively low level of abstraction, their coordination is architecturally separated and often…

Robotics · Computer Science 2020-11-17 Razan Ghzouli , Thorsten Berger , Einar Broch Johnsen , Swaib Dragule , Andrzej Wąsowski

Procedural content generation (PCG) is a growing field, with numerous applications in the video game industry and great potential to help create better games at a fraction of the cost of manual creation. However, much of the work in PCG is…

Artificial Intelligence · Computer Science 2023-07-20 Michael Beukman , Manuel Fokam , Marcel Kruger , Guy Axelrod , Muhammad Nasir , Branden Ingram , Benjamin Rosman , Steven James

Procedural Content Generation via Reinforcement Learning (PCGRL) foregoes the need for large human-authored data-sets and allows agents to train explicitly on functional constraints, using computable, user-defined measures of quality…

Artificial Intelligence · Computer Science 2022-08-16 Zehua Jiang , Sam Earle , Michael Cerny Green , Julian Togelius

In recent years, robots are used in an increasing variety of tasks, especially by small- and medium- sized enterprises. These tasks are usually fast-changing, they have a collaborative scenario and happen in unpredictable environments with…

Robotics · Computer Science 2022-03-11 Matteo Iovino , Fethiye Irmak Doğan , Iolanda Leite , Christian Smith

Robotic assembly tasks remain an open challenge due to their long horizon nature and complex part relations. Behavior trees (BTs) are increasingly used in robot task planning for their modularity and flexibility, but creating them manually…

Robotics · Computer Science 2025-06-19 Jicong Ao , Fan Wu , Yansong Wu , Abdalla Swikir , Sami Haddadin

Recent years, there has been growing interests in experience-driven procedural level generation. Various metrics have been formulated to model player experience and help generate personalised levels. In this work, we question whether…

Artificial Intelligence · Computer Science 2022-07-06 Keyuan Zhang , Jiayu Bai , Jialin Liu