New CRAZY fluid simulations in Blender!

Making your own fluid simulation is so cool!
➡️ Sign up and get the bonus content for free: www.badnormals.com/
➡️ Get the nodes: bit.ly/fluidnodes
Challenges and help:
Discord: / discord
Exclusive content, project files and channel support:
Patreon: / badnormals
Smart people who helped me:
graphics.cs.cmu.edu/nsp/course...
jamie-wong.com/2016/08/05/web...
/ @seanterelle
00:00 Intro
02:29 The grid
03:03 Creating the velocity
04:23 Making it move
08:31 Using the timestep
10:15 Divergence
16:50 Finding the pressure
21:43 Making a cool scene
22:00 Adding points
26:03 Filling the holes
29:14 Performance issues
32:22 Solving the flicker
33:52 The colors!
38:38 Free bonus stuff!

[@metashrew]

i love the extra visualisations! those must've taken a lot of work

[@BadNormals]

yeah, about two weeks or so, I'm glad they are useful

[@henkkok9437]

Was thinking the same thing, the presentation here is really really good, thank you for creating such a superb explanation

[@VerrueckterStoff]

@@BadNormals definitly! i really appreciate your work!

[@nahoj.2569]

i like the node groups thingy, it allows you to make tutorials about more complex stuff without needing to waste time explaining all these little things, so you can instead focus on the more important bits.

[@BadNormals]

If this gets generally positive feedback, I'll continue with that in future as well

[@apoc519]

Geometry nodes is REALLY not artist friendly. This stuff makes a lot more sense in Houdini. I've been disappointed with it's implementation and progress. Maybe in 5 years. Why are we wasting hours building something that takes 2 clicks in other software?

[@nahoj.2569]

@@apoc519 i highly disagree, i started as a literal pencil and paper artist and ive done ridiculous stuff with geometry nodes. my profile pic is also a 3d model i made years ago. geometry nodes is complex because its powerful. once i wrapped my head around the workflow i RAN with it, it should be mentioned that i had experience with shader nodes beforehand though.

[@timnolte2093]

If you got to moving the points and discovered they’re moving vertically, instead of staying on the surface, here’s your solution! It’s because the noise texture we used way back at 7:40 to set the initial velocity (v) attribute is three dimensional-it has a Z component. That means when we use these velocities to move the points at 23:53 they move vertically. When @BadNormals previews the velocity attribute at that timecode (23:53), you can tell he’s removed the Z component because there are no blue colors in the preview. Blink and you’ll miss it, but at 22:18 you can see a Vector Math Multiply node has been added, multiplying Z by zero to remove that component just before storing the velocity (v) attribute in the fluid grid.

[@BadNormals]

Thanks for the helpful comment, forgot to mention it in the video

[@RHKO]

Thank you, thought I was going a bit crazy there 🤣

[@visualdojo2469]

Thank you! I was searching for mistake about 30 min 😄

[@Si-annMusic]

Thanks, you are a lifesaver! (This should really be pinned)

[@dudagfx]

What a legend! Thank you :D

[@vinay0arts]

The two issues most will get are Moving points vertically:- can be solved by 22:18 you can see a Vector Math Multiply node has been added, multiplying Z by 0 Flickering:- Animate Radius node group and remove multiply math node above Float curve Happy Blending Artists Thank you Bad Normals for the wonderful tutorial 🤩

[@DomeStiefel]

You saved my day

[@vinay0arts]

@@DomeStiefel Glad, it helped. I sometimes share some tips on my channel too 😁✌

[@_JonathanTait]

digital hugs!!

[@ordinaryalien69]

man i love u so much well not really but yea

[@maxleveladventures]

Absolutely insane. I'll definitely be coming back to this. So impressed. The instructional visuals were top notch and made the whole thing so much easier to understand. There are sooooo many free beginner tutorials on KZbin, but so very few intermediate+ tutorials (I have several assumptions for why that this). This was great and helped me feel a lot more comfortable and informed about Stored Named Attributes.

[@MysteryPancake]

This is insane! Really cool to see a lot of Houdini microsolvers remade in Blender

[@bentheremedia3011]

This is awesome! I followed a similar tutorial to create a 2D fluid dynamics simulation in Touch Designer a little while ago. I followed the tutorial to a T and was very pleased with the result but I didn't fully understand each component until watching this video. Your visuals are really awesome! I appreciate you taking the time to put this together.

[@Mounir_ALSAYED]

I really don't know what we could do without you, look at that style of explanation, i wish we were taught like this in school and university. Relly thank you. 01:35

[@realvjy]

This is so good and really CRAZY. Thanks for explaining the math behind it so easily.

[@KRLYProductions]

As always, amazing tutorial!

[@fLuk333]

anytime you upload I know for a fact im gonna get humbled with my knowledge

[@BadNormals]

I try my best!

[@stiliankasimov]

You're such a brilliant mind. Never cease to amaze. Thanks for sharing your great work and insights with us.

[@williamlacrosse9389]

This is mindblowing bro. Pure gold. Such a gift.

[@A_Train]

This is a great tutorial on geo nodes in general. So much learning!

[@KabeeshS]

Wow the tutorial and editing itself had gone next level.

[@HamzaARTi]

the quality of this tutorial is just amazing !

[@alexandermoyle9034]

Beautiful! Clever and interesting watch, thank you!

[@UHStudio]

Super well done! Video, and explanation and so much packed into 40 mins!!

[@MH55555555]

The quality of this video is absolutely insane

[@N00BleSouP24]

You’ve blown my mind a few times in the first minute, I’m ready for the rest lol 😂

[@Iretemi3d]

Beautiful video @BadNormals, thanks to you im confident to start a journey into simulation nodes.

[@BadNormals]

I'm happy I made your life easier!

[@opti12]

Quality! Thank you

[@cgdoctor8241]

This is really dope stuff

[@aura__3D]

Man i was about to sleep, accidentally i find out your channel and i’ve been watching your videos for 2hours.. someone help me i can’t stop watching 😫 you are a genius frfr can’t wait for the course

[@BadNormals]

Thanks! Hopefully you could catch some sleep 😀

[@saulreyes8964]

amazing!

[@kangsan2014]

I wonder when Blender foundation will start updating their physics simulation engines. Donors nowadays only focus on UI and render engines. I hope we see more real world physics simulations in Blender.

[@Hadrhune0]

the whole geometry node and simulation nodes are the building blocks for the physics simulation engine, I guess.

[@ottomoir4564]

Just finished a 3d implementation, thanks for laying the groudwork out for me!

[@BadNormals]

Awesome! Can you share it? Send to my email, I would love to see it.

[@PunmasterSTP]

Man, I really need to play around with Blender; these simulations and tutorials are awesome!

[@pan0ptic0n]

beautiful animated infographics

[@armenkeshishian5974]

Thank you so much.💕💕💕💕💕💕 Would you please consider making a longer video about this topic? The swirly effect looks awesome.

[@lucasvisionvjbitar]

great video, nice dreadlocks, big up!

[@UstedTubo187]

The gold fluid coming out of the eyes at 38:38 looks awesome!

[@Froothy]

this will be great for making flow maps for rivers in games

[@SANAYSAHANI]

Awesome geo node stuff

[@mastermax4658]

You are absolutely genius

[@MMMM-sv1lk]

amazing work bravooo 🙌👐👏👏👏

[@Serhii_Sirko]

Awesome!

[@cgndev]

Helpful!!!!

[@dialac1]

A ground up geometry nodes course will be really appreciated and is needed. That’s where most blender users still lack knowledge and understanding. I just signed up.

[@BadNormals]

I'll try to make it the best of the best!

[@Aaws424]

Damn what an amazing tutorial thank you ❤

[@BadNormals]

I'm glad you liked!

[@algpmmm]

you make awesome content! I was testing and the advect node is different from the one I downloaded, I just changed it to how it is in your video and now it works

[@BadNormals]

Great you let me know, I'm gonna fix it

[@algpmmm]

Sorry, the node was ok, trying with the timestep node everything works fine. keep making good content :)

[@Anushka-kx8mv]

HEY, I CAN'T FIND ADVECT NODE IN BLENDER 3.6. PLS HELP @@algpmmm

[@mcwetube]

Funny thing: when you were making the pressure calculation using iterations and you said that we started to see a pattern, it seemed to me like the pressure was more than just a pattern: it was the perfect negative of the divergence. So on a whim, I tried replacing the entire pressure calculation with just the divergence multipiled by -1, and it actually worked perfectly! :)) Another note: instead of adding/deleting points continuously, just fix the velocity in the border cells at 0. I did this by making a boolean attribute for edges with more than one face neighbor (so now border vertices are zero, others are one) and multiplying this by the advected velocity in the sim zone. This causes the borders to become walls, and the particles stay inside them. With these improvements the sim is even more performant.

[@naeemulhoque1777]

Amazing!!!!!!!!!!

[@amootoon4032]

놀랍습니다. 강좌의 수준이 다른 채널과는 차원이 틀리네요. 👍👍👍

[@BadNormals]

매우 감사합니다!

[@berrlinerr]

nice hair dude, i love it!

[@anassulaiman888]

it's just like magic

[@NTMTR_OFFICIAL]

Ok I rarely leave comments glorifying tutorials, but not even half-way through this one is on another level.. the humorous touches here and there are definitely the cherry on top !

[@yash493_]

you are the GOAT🐐🐐

[@12ben41]

Fantastic!! It could be another way to make Apple Events logo.

[@rumur]

i did not expect my boy to have dreads, thanks for the dank video.

[@ruslandad365]

Amazing Tutorial!!! Thanks!!!

[@cloesense7038]

Hi, I’m very new to blender. I made it up to 6:22 where you try the animation. Mine didn’t do anything but I noticed that the advect on your video has a 4 on the right side and mine has a 2. I don’t know what this means but, could this be the reason why mine doesn’t work?

[@indoorjetpacks]

if you're following it exactly like i was and also doing things he doesnt say (common thing i've seen with blender tutorials so i've learned to keep an eye out), and you deleted the group output at 5:37, re-add the group output and connect it's geometry input to the simulation zone output.

[@mixikpixi6123]

Crazy big brain

[@sanjaux]

14:00 Usually this is where I give up because I don't know why something like that is happening LOL

[@iguesslikethat]

There are TWO move points noe groups, you need the one with the object instanced

[@jpval3484]

look at all those cool stuff my old gpu can't handle lol

[@sirwani_k320]

that is next level shit bro, I doubt few universities in the world have this level of teaching method I seriously doubt it thanks for the great tutorial the blender comminuty is unbelievable I can't believe this is free!

[@BadNormals]

This must be the best compliment when you teach better than a university, thanks!

[@starbuck8192]

tried to follow didnt go well ( probably my skill level ), but great content and love to see more

[@rajendrameena150]

I think it is the time now blender people should use and make Premade node that are optimized becuase at the end everything in computer is code and libraries that we use knowingly or unknowingly. thats why my long-term goal is to shift to linux as well.

[@indoorjetpacks]

6:13 if you dont see it moving and you've been pausing and backing up to follow exactly because some actions don't get said, and you deleted your group output like he did before making the simulation zone - add it back and this should fix it

[@catcat-yb3lv]

so cool! I wonder if it is possible to create a 3D fluid simulation? I'm very much looking forward to it!

[@collinijou]

你的视频教学内容总是充满了惊喜和惊艳，非常硬核而有趣味，讲解清晰明了，期待你的课程。但是，我最终还是学习不到，用这样的方式使用几何节点，对于数学基础较弱的人，这太难了。

[@sarmonkathar8461]

Like, how genius of a mind does one need in order to, let alone create something like this, but to just understand what is being taught here?... Asking for a friend!

[@movee_tv]

That's what I'm talking about!!!

[@komojo]

Very cool. I've already used this to make some cool fluid animations. One thing I'm curious about: When it's updating the velocity properties, does it overwrite the same properties that it's reading from? It seems like that could add some inaccuracy depending on what order it's evaluated, which you could avoid by using some kind of double-buffering. I'm not sure if it does that automatically in the geometry nodes, though.

[@udge]

I'd like to create a similar swirling texture, but with a solid material instead of points. Is there a way I could store the velocities of each point as a named attribute, and then use the result as a vector map in shader nodes?

[@SuperIceteapeach]

Bruh are you a Wizard?! 🤯

[@BadNormals]

I just practice a lot 😄

[@SteveHaiman]

Tremendous video. Easy to follow along, and I learned a ton. Made the first simulation and it is awesome (IMO)! I now want to try to make the simulation you show on the face with the gold coming from the eye. You mention that you show on the full length video how to do that but I don't see it in the 2 hour video. Can you give me the link to the video that shows how to do that? THANKS!!!

[@deniszarubin2920]

This is a triple-A level of tutorials

[@AR_3608]

is simulation wery cool and crazy

[@ZeroDean]

🤯🤯🤯🤯🤯

[@james_r_frost]

Hey all, quick question: How would I transfer this across files? As in how would I attach this to another model. I've followed the tutorial in my Goe Nodes Asset library file and am wondering how I would have them marked as an asset. Do I need both the Fluid object marked and the secondary sim tree marked as well? And do both need to come along when I use it on another model, like the face example our esteemed teacher showed off? Thanks sir, stunning tutorial, awesome work as always!

[@Phil-12345]

When i want to bring in the Named Attribute dt nothing happens and the projekt stops working. Can someone explain me how it get the Attribute dt in my Projekt?

[@LeraKimchi]

same issue!

[@ReinOwader]

Pagan, mul on ikka hea kõrv. Kuulasin ja mõtlesin, et natuke nagu eestlase aktsent. Aga polnud päris kindel. Mõtlesin, et äkki on lätlastel sarnane aktsent või oled hoopis skandinaavlane. Siiski vana video reetis rahvuse ära. Olen juba kunagi varem ühte sinu tutoriali järgi teinud ja siis polnud mul aimugi uurida kust autor pärit. Tänud ja Thumbs up.

[@BadNormals]

No täpne kõrv jah 😀. Tänud.

[@cristinabalta]

I really love how amazing your tutorials always are! I was just wondering how could I adjust the speed of the overall animation? I can't seem to be able to adjust it without messing up either the pattern or something else? Thank you!

[@riccardofasoli5726]

amazing tutorial! quick question: i was trying to find a way to slowly change the flow patter during time, but seems hard to achieve. changing the seed of the flow sim noise texture obviously doesn't work. any idea?

[@jay_isley]

Would love to know how you created the animation with the fluid flowing out of the eyes of the head model?

[@dudagfx]

This is looking fantastic!!!! Is it possible to make a fire sim with simulation nodes? Something that would be faster than regular sim in blender?

[@BadNormals]

I'm pretty sure, I might try it out.

[@dudagfx]

@@BadNormals fingers crossed! :P

[@NickHillAnimation]

Brilliant tutorial. I'm using this technique with multiple cameras, though, and every time I change the start frame to render a new shot, the simulation resets itself - it basically starts from having 0 particles, rather than having the particle count it would have if I'd started rendering from frame 0. Is there a way to add a "run-up" variable somehow that will run N steps of the simulation before it evaluates the first frame? I tried using a repeat zone with the mesh part of the geonodes setup (distribute points on faces, store og_pos etc) but couldn't get that to work.

[@SiggyF]

You mention that Delta Time was not working. This might be due to that Delta Time (in blender 4.0) is 0 at the first timestep. So if you scale using Delta Time from the simulation node, you clear your velocity field. If I replace the initial dt for frame 1 by 1/fps it works for me.

[@BadNormals]

Thanks!

[@user-zw3fx7nw5e]

How did you do it?I don't understand

[@user-zw3fx7nw5e]

I have no DT node

[@user-oo2xw4qy6f]

I can't get a red face like it in the video. I checked more than 3 times, but I couldn't figure out the problem, I added the viewer but it can't show the color of the vector, it is just black(I opened the face orientation)😭😭

[@iguesslikethat]

is the named atrebute node set to vector?

[@Nicogs]

same, altho I do see the noise texture only it's black and white for me

[@user-oo2xw4qy6f]

yes, I set it to vector, and the version of the blender is 4.0.1, it's totally black and weird@@iguesslikethat

[@iguesslikethat]

@@Nicogs change from fac, to color

[@anobaka5731]

I had the same problem and found the issue. Select the "Viewer" node, in the sidebar select "Node" and under "Properties" set it to Vector.

[@flarrossa]

hey mr. bad normals, how can i integrate that ripple animation you taught on the bonus content to this point cloud animation?

[@BadNormals]

You have to ad the ripple animation on a plane and then use a raycast node to project the points onto the surface of the ripple plane. Do this after the simulation of the points.

[@JustinPerea]

Hey my graduate mathematical physics course is going to be handy now (jk I will still use Chat GPT)

[@TiagoTiagoT]

Would it be possible to make the new particles inherit the mapping coordinates of the average of nearby particles at the time of birth, so that it don't get reset past a certain range?

[@BadNormals]

It would be possible actually. After moving the points you could use the index of nearest node and evaluate the og_pos attribute at that index and store it as the og_pos of that new point.

[@blockthechainer]

is there a reason to disappear the gird when try to undo?

[@micemincer]

would be possible to construct this but in 3d - a 3d vector grid ?

[@BadNormals]

Yes, it's possible, but needs a little bit more work since the "sample nearest surface" doesn't work any more and a "sample nearest voxel" would need to be built manually.

[@nilesman7905]

Я плохо говорю по англиски, но я все понял. Чувак ты гений, так держать)

[@BadNormals]

Спасибо! Ну я постараюсь!

[@zskull162]

I got to the part where you scale the velocity by delta time for the Points geometry nodes, and all the sudden the points started moving vertically. I don’t know why, because all my nodes are the same as yours. Only weird thing is that when i searched for “dt” it didn’t show up as a pre-existing variable

[@timnolte2093]

I ran into the same issue. It’s because the noise texture we used way back at 7:40 to set the initial velocity attribute (v) is three dimensional-it has a Z component. That means when we use these velocities to move the points at 23:53 they move vertically. When @BadNormals previews the velocity attribute at that timecode (23:53), you can tell he’s removed the Z component because there are no blue colors in the preview. Blink and you’ll miss it, but at 22:18 you can see a Vector Math Multiply node has been added, multiplying Z by zero to remove that component just before storing the velocity attribute in the fluid grid.

[@zskull162]

@@timnolte2093 Thanks

[@nurieko]

I finished the tutorial and the fluid works but no colors are showing in the viewport or render. Not sure if there was a step I missed or it was cut out. Blink and you can easily miss something. Overall, really cool tutorial, kinda hard to follow with couple steps cut out and the side demonstrations but thankfully the comments section figured most of it out.

[@shamant1999]

what if I want to add an object that goes through the field, and the particles interact with it? How would I do that? Should I add a geo info into the simulation zone?

[@AudioPervert1]

WOW ! really ...trying to copy this!

[@LittleGorille]

Thank you for this great tutorial. Im working on art project with artists and im would like to know if it s possible to do this with a picture. Start with picture and liquify blending color, image ? My final objectif creat a fade on fx and fade off fx, and maybe between image A and B. blend oil painting fx

[@BadNormals]

Yes, it is, as I did in the end of the video, but a bit more complicated. You need to advect the UVs of the object and then use them to map a texture.

[@user-pp5tx6oo7r]

How might I go about adding physics into this, so a 3d object can interact with the scene?

[@Nicolaskaw]

Amazing Tutorial! one Question: How come my points are moving great at first, but after some seconds they start moving in one direction only, as if the vector math subtract node stopped working?

[@user-px6zm2zm1h]

Nice, work and tutorial! What computer hardware are you using? I want to learn blender, but my computer is too bad

[@BadNormals]

Thanks! I use a PC with i9-12900K, RTX3090, 64GB RAM and a 2TB Samsung SSD. That's the last year though. I started out with a low performance laptop.

[@user-px6zm2zm1h]

@@BadNormalsthank you so much for the answer! I am thinking of buying a used computer with these hardwares. CPU: AMD Ryzen 5 5600x GPU: AMD Radeon RX6700XT RAM: 32GB Corsair vengeance 3600Mh MODERKORT: ASUS ROG Strix B550 F PSU: Corsair RMe Series RM850e CHASSI: Corsair iCUE 4000x Midi tower SSD: 2TB Kingston SSD Do you think you can render 3d particle simulation with this set up?

[@BadNormals]

@@user-px6zm2zm1h The setup goes good in my opinion, but I'd take an Nvidia RTX GPU. AMD seems to have some compatibility and performance issues. But certainly check Blender forums about that.

[@M_Lopez_3D_Artist]

ive done exactly the same thing and still having issues with the material it wont show up for those particles just for the floor mesh

[@E4F1]

Might be the only one, but im having issues with the Pressure attribute storing for some reason even with the node

[@YvesBonheur]

Excellent tutorials,but it could be better if you don't use those preset node groups because personally I think it‘s not beginner-friendly😂

[@xiaolan566]

This is awesome! I try to do the same effect in Touch Designer and failed. Now I made it! Still have a question: I try to change the size of it. So I change the grid. But the effect didn't follow. Are there any other node need to be changed? Hope to be answered! Thanks！

[@BadNormals]

Hey, this is a bit tricky to do, since in this tutorial I don't account for the distance between grid points. So when the distance is 1m or 1cm the result would be actually different. That's because the velocity would be multiplied with a certain coefficient depending on the grid measure. I recommend playing with the resolution, but I couldn't personally get very different results with this one either.

[@jakejake6029]

I think there's an add on that does similar thing like you did here

[@BadNormals]

Do you mean molecular? It can do similar things yep, but it calculates every point individually and gets very slow if as many points are added

[@jakejake6029]

@@BadNormals Oh, now I understand what the difference is, so your technique is more fps-friendly, thanks, I thought you used the same approach as the other one

[@jakejake6029]

@@BadNormals thanks for the information and knowledge