Real-Time Screen-Space Liquid Rendering with Two-Sided Refractions

In interactive applications such as games, particle-based liquids are often used for simulation. Such liquids are rendered with only a single refraction at the front-facing surface, which damages photorealism because it cannot express the thickness of liquid. In this paper, we propose an approach to render particle-based liquid with twice refraction at frontand back-facing surfaces in real time. We use two existing approaches, i.e., one is to generate the liquid surface from particles in real time, and the other is to render a polygon mesh with handling two-sided refraction in real time. We further accelerate the intersection calculation of the back-facing surface and viewing rays by the secant method.