arXiv:2602.14965cs.CVcs.RO2026-02被引 4

单图生成可动3D物体,自动分解部件并保持运动合理。

PAct: Part-Decomposed Single-View Articulated Object Generation

  • 以部件为中心建模,用潜变量显式编码部件身份与运动信息。
  • 生成结果在结构和运动上更符合输入图像,推理速度提升数十倍。
  • 适合需要快速生成可交互3D资产的机器人、VR/AR应用。

可动物体是交互式3D应用(如具身AI、机器人、VR/AR)的核心,其功能性的部件分解与运动机制至关重要。然而,高质量可动资产的生成难以规模化,因需可靠部件分解与运动绑定。现有方法主要分为两类:基于优化的重建或蒸馏,虽准确但每实例需数十分钟至数小时;以及推理时依赖模板或部件检索的方法,生成结果虽合理但可能不匹配输入观察的特定结构与外观。本文提出一种以部件为中心的生成框架——PAct,通过显式部件感知条件,联合生成部件几何、组合关系与可动性。该表示将物体建模为一组可移动部件,每个部件由带部件身份与运动线索的潜变量编码。给定单张图像,模型生成保留实例级对应关系、具备有效结构与运动的可动3D资产。该方法避免了实例级优化,实现快速前向推理,并支持可控组装与运动。在常见可动类别(如抽屉、门)上的实验表明,相比优化基与检索基基线,本方法在输入一致性、部件准确性与运动合理性方面均有提升,同时显著降低推理时间。

原文摘要 · Abstract (English)

Articulated objects are central to interactive 3D applications, including embodied AI, robotics, and VR/AR, where functional part decomposition and kinematic motion are essential. Yet producing high-fidelity articulated assets remains difficult to scale because it requires reliable part decomposition and kinematic rigging. Existing approaches largely fall into two paradigms: optimization-based reconstruction or distillation, which can be accurate but often takes tens of minutes to hours per instance, and inference-time methods that rely on template or part retrieval, producing plausible results that may not match the specific structure and appearance in the input observation. We introduce a part-centric generative framework for articulated object creation that synthesizes part geometry, composition, and articulation under explicit part-aware conditioning. Our representation models an object as a set of movable parts, each encoded by latent tokens augmented with part identity and articulation cues. Conditioned on a single image, the model generates articulated 3D assets that preserve instance-level correspondence while maintaining valid part structure and motion. The resulting approach avoids per-instance optimization, enables fast feed-forward inference, and supports controllable assembly and articulation, which are important for embodied interaction. Experiments on common articulated categories (e.g., drawers and doors) show improved input consistency, part accuracy, and articulation plausibility over optimization-based and retrieval-driven baselines, while substantially reducing inference time.

3D生成可动物体部件分解单图生成

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