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  • $\begingroup$ See this paper: "Interactive Rendering of Non-Constant, Refractive Media Using the Ray Equations of Gradient-Index Optics", and potentially "Ray Tracing in Non-Constant Media" by Stam. Essentially you need to do some kind of ray-marching. You need to find a potentially curved path up to some precision such that it minimises time traveled (i.e. geodesic curves). $\endgroup$ Commented Jun 8, 2022 at 15:31