How to keep 3D reconstructions consistent as video streams flow

Video streams break existing 3D object generators—applying them frame-by-frame produces flickering, inconsistent results. Stream3D fixes this by maintaining a compact memory of the most informative historical frames, pruning outdated ones to keep memory constant as the stream lengthens. The system works with any frozen generator (SAM 3D, TRELLIS, Hunyuan3D) and outperforms simpler baselines on both real and synthetic video benchmarks without modifying the underlying model.