Proxyboros: Motion-Faithful Dynamic Self-Intersection Repair for Rigged Mesh Animations

Physically plausible animation of rigged shapes is essential for realistic and high-quality 3D content creation. However, motion sequences produced by existing generation models often exhibit surface collisions and self-intersections, resulting in physically implausible geometry and noticeable visual artifacts. Resolving these invalid surface geometries while faithfully preserving the spatiotemporal characteristics of the original motion remains a challenging yet under-explored problem. To address this, we propose Proxyboros, an optimization framework for dynamic self-intersection repair that alternates mesh-space repair with rig-space pose adaptation to progressively guide the evolving rig toward temporally coherent skeletal motion. Within each step, Mesh-Space Proxy Exploration first extracts intermediate geometric proxies that capture local repair tendencies before independent repairs crystallize into temporally inconsistent static solutions. Proxy-Guided Pose Adaptation then incorporates this guidance into a temporally coupled skeletal trajectory using surface-aware proxy guidance, absorbing stable surface-separation cues while relaxing ambiguous local displacements. Experiments on SMPL-H sequences and diverse non-SMPL rigged models demonstrate favorable overall performance over state-of-the-art methods in repair quality, pose preservation, and motion fidelity, with demonstrated applicability across heterogeneous mesh and skeleton topologies. See our anonymous project page for more video demos: https://anonymousiclr2724.github.io/Proxyboros.