Long-horizon Video Generation with Slot Memory Addressed By Region Tokens

Eren Cetin; Julius Erbach; Vukasin Bozic; Hyojun Go; Zixiang Zhao; Nikolai Kalischek; Federico Tombari; Konrad Schindler; Dominik Narnhofer

arXiv · 2610.19257

Long-horizon Video Generation with Slot Memory Addressed By Region Tokens

Eren Cetin·Julius Erbach·Vukasin Bozic·Hyojun Go·Zixiang Zhao·Nikolai Kalischek·Federico Tombari·Konrad Schindler·Dominik Narnhofer

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Abstract

Memory for long-horizon video generation must satisfy two competing requirements: it must remain bounded so generation can continue indefinitely, while still recovering what was observed at a place when the camera returns, regardless of how long ago it was seen. Reconstruction-based memories provide spatial recall by caching and reprojecting explicit geometry, but require growing storage and depend on estimated 3D structure. Recurrent memories keep a constant-size state, but retention is governed by temporal recurrence, causing old observations to fade with time. We introduce SMART, a slot memory addressed by region tokens, which combines bounded storage with spatially addressed recall. SMART stores content in a constant-size slot recurrence whose writes are addressed by the observing camera and whose reads are queried by the rendering camera, without constructing an explicit 3D representation or maintaining a growing cache. Consequently, recall is conditioned on inter-view geometry rather than on recency. Each read additionally provides a confidence estimate that conditions a chunk-causal diffusion transformer, allowing it to selectively trust retrieved content while relying on its generative prior elsewhere. On long trajectories in Memory Maze and Minecraft, SMART maintains high-fidelity recall far beyond its training horizon while using constant memory and per-step cost.

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BibTeX RIS

Eren Cetin, Julius Erbach, Vukasin Bozic, Hyojun Go, Zixiang Zhao, Nikolai Kalischek, Federico Tombari, Konrad Schindler, Dominik Narnhofer. 2026-10-13. Long-horizon Video Generation with Slot Memory Addressed By Region Tokens. https://arxiv.org/abs/2610.19257

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