#TTT3R: 3D Reconstruction as Test-Time Training
TTT3R offers a simple state update rule to enhance length generalization for #CUT3R — No fine-tuning required!
🔗Page: rover-xingyu.github.io/TTT3R
We rebuilt @taylorswift13’s "22" live at the 2013 Billboard Music Awards - in 3D!

TTT3R: 3D Reconstruction as Test-Time Training

@xingyu-chen.bsky.social, @fanegg.bsky.social, @xiuyuliang.bsky.social, @andreasgeiger.bsky.social, @apchen.bsky.social

arxiv.org/abs/2509.26645

TTT3R: 3D Reconstruction as Test-Time Training

Xingyu Chen, Yue Chen, Yuliang Xiu, Andreas Geiger, Anpei Chen

tl:dr: predict delta and scale for new tokens via kind of hypernetwork?
arxiv.org/abs/2509.26645

Chen et al., "TTT3R: 3D Reconstruction as Test-Time Training"

Cut3R + gated updates for states (test-time training layers) = fast/efficient performance of cut3r, but with high-quality estimates.

🔗Page: rover-xingyu.github.io/TTT3R
📄Paper: arxiv.org/abs/2509.26645
💻Code: github.com/Inception3D/...

Big thanks to the amazing team!
@xingyu-chen.bsky.social @fanegg.bsky.social @xiuyuliang.bsky.social @andreasgeiger.bsky.social @apchen.bsky.social

#VGGT: accurate within short clips, but slow and prone to Out-of-Memory (OOM)

#CUT3R: fast with constant memory usage, but forgets.

We revisit them from a Test-Time Training (TTT) perspective and propose #TTT3R to get all three: fast, accurate, and OOM-free.

Test-time training 3D reconstruction

https://github.com/Inception3D/TTT3R

Test-time training 3D reconstruction | Discussion

https://github.com/Inception3D/TTT3R

Xingyu Chen, Yue Chen, Yuliang Xiu, Andreas Geiger, Anpei Chen: TTT3R: 3D Reconstruction as Test-Time Training https://arxiv.org/abs/2509.26645 https://arxiv.org/pdf/2509.26645 https://arxiv.org/html/2509.26645

rover-xingyu.github.io/TTT3R/

Xingyu Chen, Yue Chen, Yuliang Xiu, Andreas Geiger, Anpei Chen
TTT3R: 3D Reconstruction as Test-Time Training
https://arxiv.org/abs/2509.26645

Tried github.com/Inception3D/... which is based on Cut3r on my new R9700 with rocm6.4:

:0:rocdevice.cpp :2994: 3132065952 us: Callback: Queue 0x7f43ce000000 aborting with error : HSA_STATUS_ERROR_EXCEPTION: An HSAIL operation resulted in a hardware exception. code: 0x1016

Yea...