GenXD: Generating Any 3D and 4D Scenes
Authors: name: Yuyang Zhao, name: Chung-Ching Lin, name: Kevin Lin, name: Zhiwen Yan, name: Linjie Li, name: Zhengyuan Yang, name: Jianfeng Wang, name: Gim Hee Lee, name: Lijuan Wang

Recent developments in 2D visual generation have been remarkably successful.
However, 3D and 4D generation remain challenging in real-world applications due
to the lack of large-scale 4D data and effective model design. In this paper,
we propose to jointly investigate general 3D and 4D generation by leveraging
camera and object movements commonly observed in daily life. Due to the lack of
real-world 4D data in the community, we first propose a data curation pipeline
to obtain camera poses and object motion strength from videos. Based on this
pipeline, we introduce a large-scale real-world 4D scene dataset: CamVid-30K.
By leveraging all the 3D and 4D data, we develop our framework, GenXD, which
allows us to produce any 3D or 4D scene. We propose multiview-temporal modules,
which disentangle camera and object movements, to seamlessly learn from both 3D
and 4D data. Additionally, GenXD employs masked latent conditions to support a
variety of conditioning views. GenXD can generate videos that follow the camera
trajectory as well as consistent 3D views that can be lifted into 3D
representations. We perform extensive evaluations across various real-world and
synthetic datasets, demonstrating GenXD's effectiveness and versatility
compared to previous methods in 3D and 4D generation.