Reasoning3D - Grounding and Reasoning in 3D: Fine-Grained Zero-Shot Open-Vocabulary 3D Reasoning Part Segmentation via Large Vision-Language Models

In this paper, we introduce a new task: Zero-Shot 3D Reasoning Segmentation, a new paradigm in 3D segmentation that goes beyond traditional category-specific methods. We propose a baseline method, Reasoning3D, that leverages pre-trained 2D segmentation networks powered by Large Language Models (LLMs) to interpret user queries and segment 3D meshes with contextual awareness. This approach enables fine-grained part segmentation and generates natural language explanations without requiring extensive 3D datasets. Experiments demonstrate that Reasoning3D can effectively localize and highlight parts of 3D objects. Our training-free method allows rapid deployment and serves as a universal baseline for future research in various fields such as robotics, object manipulation, autonomous driving, AR/VR, and medical applications. The code and the user interface have been released publicly.