OMG: Opacity Matters in Material Modeling with Gaussian Splatting - Yong, Silong; Pudureddiyur Manivannan, Venkata Nagarjun; Kerbl, Bernhard; Wan, Zifu; Stepputtis, Simon; Sycara, Katia; Xie, Yaqi (International Conference on Learning Representations, 2025)