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arXiv · 2603.04385

ZipMap: Linear-Time Stateful 3D Reconstruction via Test-Time Training

Haian Jin·Rundi Wu·Tianyuan Zhang·Ruiqi Gao·Jonathan T. Barron·Noah Snavely·Aleksander Holynski
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Abstract

Feed-forward transformer models have driven rapid progress in 3D vision, but state-of-the-art methods such as VGGT and $π^3$ have a computational cost that scales quadratically with the number of input images, making them inefficient when applied to large image collections. Sequential-reconstruction approaches reduce this cost but sacrifice reconstruction quality. We introduce ZipMap, a stateful feed-forward model that achieves linear-time, bidirectional 3D reconstruction while matching or surpassing the accuracy of quadratic-time methods. ZipMap employs test-time training layers to zip an entire image collection into a compact hidden scene state in a single forward pass, enabling reconstruction of over 700 frames in under 10 seconds on a single H100 GPU, more than $20\times$ faster than state-of-the-art methods such as VGGT. Moreover, we demonstrate the benefits of having a stateful representation in real-time scene-state querying and its extension to sequential streaming reconstruction.

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Haian Jin, Rundi Wu, Tianyuan Zhang, Ruiqi Gao, Jonathan T. Barron, Noah Snavely, Aleksander Holynski. 2026-04-08. ZipMap: Linear-Time Stateful 3D Reconstruction via Test-Time Training. https://arxiv.org/abs/2603.04385

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