So I'm considering releasing my VRChat fluid simulation on Booth. I've ported it into Udon so it is faster and is easier to use. I used the Radix Sort from my 3DGS plugin, allowing me to do a true SPH sim without approximations. I'd love to head what you'd... want to do with it 😄show more

I've optimized the radix sort a bit too, now it can do 5 billion key/value pairs sorted per second while using 0 (!) compute shaders. This makes sorting a tiny part of the simulation. I could even make an infinite unbounded SPH sim now, but only with the particles like below:

The 0 gravity mode is especially cool looking, might be cool to make some kind of guns shooting that stuff around. It could potentially be used for gameplay, but only if you are fine with only the simulation master user having the "actual" fluid state.

Because without deterministic simulation, timestepping and input synchorization with validation the fluid sim is guaranteed to diverge. It might be still similar enough to be usable, but not if left sitting for a long time, only if you "force" the fluid into a similar state

Thats why particle pools in VRChat still "work". Particles tend to settle in the same-ish configuration with time due to gravity pulling the fluid down and not interacting with the game scene.

I want pool worlds to use this!!!!! (also i have other ideas that are more lewd of course but POOL IS EPIC)

what rendering do you prefer? balls, mentos, opaque liquid or actual ray traced fluid?

Id like to bathe in the coom pls. (also realistic water too of course)

You could for starters release demo world for people to play with it. Theres also event coming up that might be good place to show it off too

please, PLEASE, PUHLEAAAASE

A world where you could go surfing in this water would go sooooo hard!

*sigh..* alright, gimme the buy link

I would mostly lay in it and ponder

Will this be world use only, or could someone bash this into an avatar?

World.

people are gonna use this for simulating water and no other types of fluids right?

Finally we will be able to recreate the beer app

すごいクール!メッシュの当たり判定に対応してますか?

粘度を上げてスライムみたいにして身体に浴びたい

vrc内でもこのオモチャで遊びたいです！

WAVE POOL WAVE POOL WAVE POOL!!!!!!!!!!

Looks amazing!

I would buy a course or video just explaining the techniques in depth tbh

Goodbye frame rate

It would be really good for a pool or ocean world if you make one! I know theres a lot of pool worlds on VRChat but they call feel the same and dont really feel pool or ocean enough

weird big brain theory: Is it possible to bake simulations? Like, into a Seed of sorts? I'd LOVE to see this used for the rippling/crashing of waves on a shore. Sure there's LOD and culling tech, but Saving even about 20 fps would be insanely performant within VRChat.

I'd say its not easy enough to be worth it: either too much required memory, determinism issues or too much memory required

WE NEED THIS

YEEAAAAAHHHHH!!!!! This looks so cool!!!!!!

questies on their way to ps4 max:

貴方は天才だ！

@tokiwailm Oooh I would love to check it out.

How much is this gonna kill people's PCs lol

え！すごい！！！！！！！ プールもそうですがアスレチックの失敗で泥んこに落ちちゃう！みたいな使い方もしたいです✨

Mmmmm the good ol pc crasher world 9000

@VixForge

I’m building a browser strategy game about giant bee colonies, so this immediately made me think of floodwater breaching lower hive chambers or honey spilling from ruptured comb after an attack. How well can the simulation handle very different viscosities? It looks incredibly smooth for Udon. 🐝

The issue is collider leaking to be honest, without good collision handling that will never work

I just look over and my computer starts literally cooking. But truly can this run well because its really really good.

depends on what, should be fine down to something like 3060 with a smallish grid. This was 256k particles, 64k should be enough for most things

Wow that's really great. Can't wait to follow this project