VPFormer: Leveraging Transformer with Voxel Integration for Viewport Prediction in Volumetric Video. - Jie Li 015; Zhixia Zhao; Qiyue Li; Zhixin Li; Pengyuan Zhou; Zhi Liu 002; Hao Zhou 001; Zhu Li 001 (ACM Trans. Multim. Comput. Commun. Appl., 2025)