Hi, I’m Tian Xia, a master’s student in CSE at Harvard University, working with Prof. Qianqian Wang. Previously, I graduated from the University of Michigan, Ann Arbor, with majors in Honors Math, Honors CS, and DS, where I worked with Prof. Joyce Chai at the SLED Lab. Outside of research, I enjoy gaming, long walks, and exploring new cities.

Research

My research interests focus on 3D understanding, generative AI, and embodied agents, emphasizing scalable systems and cross-modal representations. I aim to develop machine learning systems that integrate diverse data modalities, such as vision, language, and 3D spatial information, to advance perception of 3D environments, generation of 3D worlds, and interaction in human-like ways.

Over time, my interests have expanded to encompass a broader range of topics, including computer vision, 3D modeling, and robotics. My current focus areas include:

Vision-centric 3D understanding: Encompassing 3D reconstruction, recognition, and generation.
Generative AI: Particularly for generating across diverse modalities and high-dimensional(3D, 4D) creation.
Multimodal Representation Learning: Integrating vision, language, and 3D spatial information.

Publications

NeurIPS 2026 (Spotlight)

MoSE3 Figure 1: dense SE(3) predictions for rigid, articulated, and non-rigid motion

MoSE3: Learning World-Space SE(3) at Every Pixel

Jiahuan Cheng*, Zhiyi Li*, Tian Xia*, Ruojin Cai, Yilun Du, Qianqian Wang

[Project][Paper]

arXiv 2026

Ranking-PE overview of multimodal clinical diagnosis and ranking-aware evaluation

Ranking-PE: Ranking-Aware Prompt Optimization for Multimodal Clinical Diagnosis

Tian Xia, Minghao Liu, Yiqing Liang, Laixi Shi, Jiayun Wang

[Project][Arxiv][Paper]

3D-LLM/VLA @ CVPR 2025

SAB3R: Semantic-Augmented Backbone in 3D Reconstruction

Xuweiyi Chen*, Tian Xia*, Sihan XU, Jianing Yang, Joyce Chai, Zezhou Cheng

[Project][Arxiv][Code][Poster]

TMLR 2024

UniCtrl: Improving the Spatiotemporal Consistency of Text-to-Video Diffusion Models via Training-Free Unified Attention Control

Tian Xia*, Xuweiyi Chen*, Sihan Xu

[Project][Arxiv][Code]

Honors and Awards

2025: Outstanding Achievement in Mathematics Awards
2024: Evelyn O. Bychinsky Awards
2024: James B. Angell Scholar
2023, 2024: M.S. Keeler Department of Mathematics Merit Scholarships
2022, 2023: University Honors

Educations

2025.08 - now, S.M. in Computational Science and Engineering, Harvard University
2022.09 - 2025.05, B.S. in Honors Mathematics, Honors Computer Science and Data Science, University of Michigan, Ann Arbor