CityX: Controllable Procedural Content Generation for Unbounded 3D Cities

• URL: http://arxiv.org/abs/2407.17572v4
• Date: Mon, 09 Dec 2024 09:30:26 GMT
• Title: CityX: Controllable Procedural Content Generation for Unbounded 3D Cities
• Authors: Shougao Zhang, Mengqi Zhou, Yuxi Wang, Chuanchen Luo, Rongyu Wang, Yiwei Li, Zhaoxiang Zhang, Junran Peng,
• Abstract summary: Current generative methods fall short in either diversity, controllability, or fidelity.<n>In this work, we resort to the procedural content generation (PCG) technique for high-fidelity generation.<n>We develop a multi-agent framework to transform multi-modal instructions, including OSM, semantic maps, and satellite images, into executable programs.<n>Our method, named CityX, demonstrates its superiority in creating diverse, controllable, and realistic 3D urban scenes.
• Score: 50.10101235281943
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Urban areas, as the primary human habitat in modern civilization, accommodate a broad spectrum of social activities. With the surge of embodied intelligence, recent years have witnessed an increasing presence of physical agents in urban areas, such as autonomous vehicles and delivery robots. As a result, practitioners significantly value crafting authentic, simulation-ready 3D cities to facilitate the training and verification of such agents. However, this task is quite challenging. Current generative methods fall short in either diversity, controllability, or fidelity. In this work, we resort to the procedural content generation (PCG) technique for high-fidelity generation. It assembles superior assets according to empirical rules, ultimately leading to industrial-grade outcomes. To ensure diverse and self contained creation, we design a management protocol to accommodate extensive PCG plugins with distinct functions and interfaces. Based on this unified PCG library, we develop a multi-agent framework to transform multi-modal instructions, including OSM, semantic maps, and satellite images, into executable programs. The programs coordinate relevant plugins to construct the 3D city consistent with the control condition. A visual feedback scheme is introduced to further refine the initial outcomes. Our method, named CityX, demonstrates its superiority in creating diverse, controllable, and realistic 3D urban scenes. The synthetic scenes can be seamlessly deployed as a real-time simulator and an infinite data generator for embodied intelligence research. Our project page: https://cityx-lab.github.io.

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