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   Nikita Lisitsa (lisyarus@mastodon.gamedev.place)'s status on Monday, 27-Jan-2025 05:28:07 JST Nikita Lisitsa

   I'm in the middle of huge refactoring, so I decided to take a break and do some water sim again. This time using the virtual pipes model, it turned out to be amazingly simple.

   Don't have time for a fancy 3D viz, but still this might be the best shallow water sim I've made :)

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     The Seven Voyages Of Steve (sinbad@mastodon.gamedev.place)'s status on Monday, 27-Jan-2025 05:28:03 JST The Seven Voyages Of Steve

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     @lisyarus assigning to flowx / flowy functions weirded me out at first but they both return references I guess? I haven’t really seen that pattern before but I guess it’s better than raw array access (assuming inlined)

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     Nikita Lisitsa (lisyarus@mastodon.gamedev.place)'s status on Monday, 27-Jan-2025 05:28:04 JST Nikita Lisitsa

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     • Philip Trettner

     @artificialmind Here's the whole update code. bed is NxN array of terrain elevation, water is NxN water column height (so bed + water is the height of water surface), flowx is (N+1)xN of horizontal pipes, and similarly flowy is Nx(N+1) for vertical pipes.

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     Nikita Lisitsa (lisyarus@mastodon.gamedev.place)'s status on Monday, 27-Jan-2025 05:28:05 JST Nikita Lisitsa

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     • Philip Trettner

     @artificialmind I'm using this paper: https://diglib.eg.org/bitstream/handle/10.2312/vriphys20181067/045-054.pdf (section 3.1 is the main stuff), without viscosity & without any multi-layer stuff, together with outflow scaling that they mention from this paper https://inria.hal.science/inria-00402079/document

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     Philip Trettner (artificialmind@fosstodon.org)'s status on Monday, 27-Jan-2025 05:28:06 JST Philip Trettner

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     @lisyarus nice! Do you have a good reference for the virtual pipes model? I did shallow water equations using the discrete exterior calculus in my masters thesis but was disappointed by the "flow feeling"

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     Nikita Lisitsa (lisyarus@mastodon.gamedev.place)'s status on Monday, 27-Jan-2025 05:42:36 JST Nikita Lisitsa

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     • The Seven Voyages Of Steve

     @sinbad Oh, that's my N-d array class with overloaded operator() (because multi-argument operator[] is only in C++23), and yep, it returns a reference!

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     The Seven Voyages Of Steve (sinbad@mastodon.gamedev.place)'s status on Monday, 27-Jan-2025 07:20:14 JST The Seven Voyages Of Steve

     in reply to

     @lisyarus ahh yeah - I quite like it