TRiGS: Temporal Rigid-Body Motion for Scalable 4D Gaussian Splatting. - Suwoong Yeom; Joonsik Nam; Seunggyu Choi; Lucas Yunkyu Lee; Sangmin Kim; Jaesik Park; Joonsoo Kim; Kugjin Yun; Kyeongbo Kong; Sukju Kang (CoRR, 2026)