Direct3D-S2: Gigascale 3D Generation Made Easy with Spatial Sparse
  Attention
Generating high resolution 3D shapes using volumetric representations such as
Signed Distance Functions presents substantial computational and memory
challenges. We introduce Direct3D S2, a scalable 3D generation framework based
on sparse volumes that achieves superior output quality with dramatically
reduced training costs. Our key innovation is the Spatial Sparse Attention
mechanism, which greatly enhances the efficiency of Diffusion Transformer
computations on sparse volumetric data. SSA allows the model to effectively
process large token sets within sparse volumes, significantly reducing
computational overhead and achieving a 3.9x speedup in the forward pass and a
9.6x speedup in the backward pass. Our framework also includes a variational
autoencoder that maintains a consistent sparse volumetric format across input,
latent, and output stages. Compared to previous methods with heterogeneous
representations in 3D VAE, this unified design significantly improves training
efficiency and stability. Our model is trained on public available datasets,
and experiments demonstrate that Direct3D S2 not only surpasses
state-of-the-art methods in generation quality and efficiency, but also enables
training at 1024 resolution using only 8 GPUs, a task typically requiring at
least 32 GPUs for volumetric representations at 256 resolution, thus making
gigascale 3D generation both practical and accessible. Project page:
https://nju3dv.github.io/projects/Direct3D-S2/.
6833e93697966d18e7c1e4d7
Shuang Wu
6833e93697966d18e7c1e4d8
Youtian Lin
claimed_verified
2025-09-13T15:05:11.747Z
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/avatars/dd0a635674025dcc9a94ee0f4c952083.svg
Youtian Lin
user
LoYoT
6833e93697966d18e7c1e4d9
Feihu Zhang
6833e93697966d18e7c1e4da
Yifei Zeng
6833e93697966d18e7c1e4db
Yikang Yang
6833e93697966d18e7c1e4dc
Yajie Bao
6833e93697966d18e7c1e4dd
Jiachen Qian
6833e93697966d18e7c1e4de
Siyu Zhu
6833e93697966d18e7c1e4df
Philip Torr
6833e93697966d18e7c1e4e0
Xun Cao
6833e93697966d18e7c1e4e1
Yao Yao
Direct3D-S2: Gigascale 3D Generation Made Easy with Spatial Sparse
  Attention
Generating high resolution 3D shapes using volumetric representations such as
Signed Distance Functions presents substantial computational and memory
challenges. We introduce Direct3D S2, a scalable 3D generation framework based
on sparse volumes that achieves superior output quality with dramatically
reduced training costs. Our key innovation is the Spatial Sparse Attention
mechanism, which greatly enhances the efficiency of Diffusion Transformer
computations on sparse volumetric data. SSA allows the model to effectively
process large token sets within sparse volumes, significantly reducing
computational overhead and achieving a 3.9x speedup in the forward pass and a
9.6x speedup in the backward pass. Our framework also includes a variational
autoencoder that maintains a consistent sparse volumetric format across input,
latent, and output stages. Compared to previous methods with heterogeneous
representations in 3D VAE, this unified design significantly improves training
efficiency and stability. Our model is trained on public available datasets,
and experiments demonstrate that Direct3D S2 not only surpasses
state-of-the-art methods in generation quality and efficiency, but also enables
training at 1024 resolution using only 8 GPUs, a task typically requiring at
least 32 GPUs for volumetric representations at 256 resolution, thus making
gigascale 3D generation both practical and accessible. Project page:
https://nju3dv.github.io/projects/Direct3D-S2/.
A scalable 3D shape generation framework using sparse volumes and spatial sparse attention, enabling high-resolution generation with reduced computational requirements.
Signed Distance Functions sparse volumes Spatial Sparse Attention Diffusion Transformer variational autoencoder gigascale 3D generation