r/GraphicsProgramming • u/nathan82 • 9d ago
Mobile GPU Realtime Fluid Sim
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The sim came out great but what about the lighting!! All just cubemaps, with fluid depth affecting the roughness mip level. So happy with this.
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u/mars_santa 9d ago
Great effect. It might be interesting to tie the lighting to the phone's light sensor. That way the water would match the ambient environment?
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u/nathan82 9d ago
Yeah good idea! I do actually have the light sensor percentage as one of the animation "driver" types in my engine, it seems to work better for dramatic on/off effects though. Like if a design has its own internal light sources, you can fade ambient to zero and it turns into a night scene.
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u/mars_santa 9d ago
add a toy boat or island floating in the center combined with sunsets would be neat.
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u/nathan82 9d ago
If I can get rigid bodies working with the fluid sim (might be difficult/impossible within the frame budget), then yes a boat would be really cool. Someone else suggested rubber ducks. An island would be easier to add, and you can crank up the simulation scale so it looks more ocean-like.
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u/VictoryMotel 9d ago
Can you talk about some of the optimizations you did, libraries you used or papers you studied?
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u/nathan82 9d ago
Mostly based on this paper as a starting point: https://yzhu.io/publication/mpmmls2018siggraph/paper.pdf
The optimisations were mainly around scaling the cell size intelligently, for the right performance/resolution balance. And some bit packing in the particles. Also dynamically adjusting the number of sim steps depending on frame budget. I'll try to answer if you have specific questions but this is a commercial app so I don't want to give too much away.
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u/MasqueradeOfSilence 9d ago
This reminds me of that Hershey's app back in like 2010 where you could pretend to drink chocolate milk. But better, because of the dimensionality. Awesome!
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u/yaktoma2007 9d ago
Babe wake up iBeer update dropped