Coding a Realtime Fluid Simulation in Unity [Pt. 2]
The last time I made a video about how to code a fluid simulation using SPH, it was pretty slow so I made this follow-up video that will hopefully help you understand how to optimize it using a dynamic hashed grid, the core technology used is Smoothed Particle Hydrodynamics, and everything is written from scratch in Unity using C# and Compute Shaders.
If this video gains some interest I'll release a third part on how to realistically render this fluid in a performant way.
The editing on this one is a bit rough, was in a rush so please forgive me for that :)
I'll see you all next time ✌
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Project Links
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GitHub: https://github.com/AJTech2002/SPH-Uni...
Base Project: https://github.com/AJTech2002/SPH-Uni...
FluidRayMarching.cs : https://github.com/AJTech2002/SPH-Uni...
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Information Links
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SPH Paper: https://matthias-research.github.io/p...
Sebastian Lague Raymarching: • Coding Adventure: Ray Marching
Thread Groups Medium Article: / compute-shader-indices
Nvidia Dynamic Hashed Grids: https://on-demand.gputechconf.com/gtc...
Bitonic Merge Sort: • Bitonic Sort - Sorting Algorithms Min...
Spatial Hashed Grids: • Spatial Hash Grids & Tales from Game ...
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Timestamps
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Intro: (0:00)
SPH Explanation: (0:34)
Dynamic Hashed Grid Explanation: (3:19)
Setting up for Optimization: (4:00)
Hashing Setup: (6:51)
Bitonic Merge Sort: (7:46)
Compute Cell Offsets: (8:55)
Density & Pressure Calculation: (14:13)
Apply Optimization: (10:38)
Testing & Bonus: (11:26)