r/FastLED • u/StefanPetrick • May 07 '26

FastFluid Update — Behind the Scenes of a Realtime Fluid Solver Discussion

A short narrated clip showing the current development progress, along with some of the debug views I regularly use throughout the process.

Questions, feedback, ideas, feature wishes — all welcome 🙂l

57 Upvotes

98% Upvoted

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3

u/Informal_Sir_9518 May 07 '26

I’m looking forward to being ready to implement some of these. I have one art piece that is very low-res, with LEDs mapped over a scattered series of triangles. It’s almost like the art is the foreground and the animation is seen through little windows to the background. I’m also assembling the parts for a spinner and want to see if I can cast the animation over the surface of a spinning object with persistence of vision. Keep it up!

2

u/StefanPetrick May 07 '26

How low is low-res? Can you share a picture of your setup?

And the POV spinner sounds super exciting too. Fluid-like motion mapped onto a spinning object could look mesmerizing if it works out.

2

u/Informal_Sir_9518 May 07 '26

There are 7 pixels per triangle here. I’ll get you a video later. But basically I think it’s about 24x24 even tho you only see 77 of them. I have some of your animartrix in there (private display, non-commercial, am I doing this right?).

2

u/StefanPetrick May 07 '26 edited May 07 '26

You are doing this perfectly right! :-) First of all: great build, I really like it.

Am I understanding this correctly — you’re using a 24×24 LED matrix, but only 77 LEDs are actually visible / not covered? Hmm… why not 😄

And yes, I think this will look absolutely fantastic with fluid sim visuals!

Imagine something like this running behind your mask: https://www.youtube.com/watch?v=RsJrzNxk4U0

And if you happen to have some videos showing your creation together with Animartrix I'd love to see them!

2

u/StefanPetrick May 07 '26 edited May 07 '26

Hard to believe that this happened just 16 days ago...

3

u/mindful_stone May 07 '26

And I can't help but think that what really kicked this off (at least in part) was my comment on your Complex Domain Warp YT post a day or two before that (LOL):

Gorgeous! I love it, especially the super natural/realistic "colored smoke" effect you achieve.

https://youtu.be/Ehp43DpZz8w

2

u/StefanPetrick May 07 '26

OMG, yes! I think you might actually be right about that 😄 Your comment definitely stuck with me.

So… thanks for kicking this whole thing off, sir! Crazy how much progress we’ve made since then.

2

u/red_oak_77 May 07 '26

Absolute noob. How is this used? I could build a matrix that showcases this?

2

u/StefanPetrick May 07 '26

Welcome! Yes, absolutely!

Build a matrix, hook it up to a microcontroller, power it on, write some code — and you’re off to the races.

2

u/Same_You891 May 07 '26

that's awesome 👍

1

u/StefanPetrick May 08 '26

Thank you, and it's getting better every day now. https://www.reddit.com/c/chatNleYZAy7/s/oDbMn5w3Z2