Tsinghua University & SparcAI · 4D Reconstruction

OVOW

One Video, One World turns a single monocular video into a simulation-ready 4D mesh scene with no task-specific training. Four training-free stages chain a vision-language model for instance discovery, category-aware mesh reconstruction for watertight per-instance geometry, iterative render-match-optimise for metric scale and 6-DoF pose recovery, and physics-grounded assembly that enforces contact constraints so the output loads straight into a simulator. Reports 82.7% physical stability under gravity simulation at 3.35 seconds per frame, one to two orders of magnitude faster than the baselines. Code released.