Asian Simulation Conference AsiaSim 2022: Methods and Applications for Modeling and Simulation of Complex Systems pp 227–238Cite as Opacity-Gradation-Based Visualization of Vortices for Large-Scale Ocean Simulation Soya Kamisaka, Satoshi Nakada, Shintaro Kawahara, Hideo Miyachi, Kyoko Hasegawa, Liang Li, Satoshi Tanaka