Unreal Engine 5 Tutorial - Niagara Fluids & Characters/Skeletal Mesh Collisions

In this video we will take a look at how to add the ability for our Niagara Fluids to interact (interactive water) with the Player/Character or Animated Skeletal Meshes.
Learn how to add more complex interactions with FLIP Fluids in Unreal Engine 5 with a Niagara FX System.
* Changes in Unreal 5.1+ *
If you don't see the User Parameters (5:24), just look at the tabs you'll see a Tab for it when selecting the Niagara System. If you don't, check under Window, User Parameters and make sure its enabled in the Niagara FX Editor.
In the collisions list at (12:57) in Unreal 5.1+ you will see the Static Mesh, and Physics Asset Collision checkboxes will be missing. Ignore the step to check them on, because in 5.1+ they are automatically enabled and no longer in that list.
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[@sebay4654]

I has no clue about mesh bool great piece of information and along with that this gives me basic information on how to fluid simulate in UE

[@onlyrussian2140]

A good lesson. I am working on the UE version 5.3.2 and in my case, the water does not react to the character in any way, I did everything as in the video, perhaps this is due to the fact that when creating an object that we call "SkeletalMeshCollision", a slot appeared for the parameter that needs to be filled, it does not accept anything except SkeletalMeshComponent, and I do not such objects, how to fix it?

[@vid828]

Will this work for cinematics using sequencer? And basic mixamo charcter animations?

[@sh0tiphone]

how to do a realistic water splashes with collisions ?

[@anakinkenway4769]

it was really helpful thanks !!!

[@user-vp7kq6bh8q]

I'm using Unreal 5.1 version, but I can't find a StaticMeshCollition

[@renderbucket]

In the collisions list at (12:57) in Unreal 5.1+ you will see the Static Mesh, and Physics Asset Collision checkboxes will be missing. Ignore the step to check them on, because in 5.1+ they are automatically enabled and no longer in that list.

[@user-vp7kq6bh8q]

@@renderbucket Thank you for the detailed explanation. It helped me a lot.:)

[@abhinavsinha293]

Thanks, that was quite helpful

[@thesinglegoblin]

crazy enough this even works in movie render queue, I was wondering if it would since you needed to run the level BP but it does.

[@Kno_696]

I need help with the water simulation, it works good but when I try to simulate it in game mode, it doesnt work.

[@lilpillstudios677]

great tutorial. is there a way to get this working with animation like in the level sequencer?

[@renderbucket]

If you want to scrub the timebar and have predictable collisions for like cutscenes or short films. You can do that by caching out the Niagara FX so its baked down then you can offset and place it in the sequencer and treat it like a baked down animation. That is covered in this tutorial here,
th-cam.com/video/RQuyRTRQg7s/w-d-xo.html
Cheers!

[@Gaientv]

Thank you !! its crazy so we can use this method for every fluid made on Niagara actually ??!

[@GILNAK_09]

thanks a lot maaan

[@hangye9258]

This doesn't seem to work in 5.3.1.Would be appreciated if someone could provide an update or make a note here.

[@hangye9258]

I ended up adding a "collider" tag to the character, but I'm still curious about what changes were made in version 5.3.1 that caused it to stop working.

[@dohrah]

@@hangye9258 hi can you please explain where exactly did you add the tag? Struggling to make it work on a metahuman. Thanks!

[@mkheisenberg]

thank you so much!

[@Enderking394]

I’m going to make a vr game demo where you can play with realistic simulated water using this

[@yunaseo7805]

Do you know How to make the code in BP_Pawn not in the level blueprint?

[@ntjson]

Great work! Do you have any recommendations on buoyancy or floating a collider mesh?

[@tazwinsdevchannel]

This ^^^

[@elenadmpl]

great tutorial is there any case to make a metahumn inside that?

[@ClydiieTwo]

Thanks so much! Player interactions works like a dream. But I couldnt get objects with the actor tag to interact with the fluid.

[@JohnRiversOfficial]

maybe, select he actor and add a bouyancy component or go through the actor and ensure all collision / physics is enabled?

[@PatrickTheDM]

Very cool, I'll give it a go. Update: It worked great, but too much of a performance hit to actually use. I'm sure it's due to the size of the pool I needed. Still, it could be great in a room where the engine doesn't need to render too much.

[@fuglong]

A little late but you could minimize calculations to just very close to the player and use a shader to fake the main water ripples

[@PatrickTheDM]

@@fuglong Thanks, I may give it a go.

[@ozanozenir2503]

its really not worth it unless it is a AAA game ( even they dont do it)

[@thegreatSalu]

Hi..is there to make the object wet and with static mesh?

[@zalansari6454]

Dude nice work, but a NOOB question: It looks like there's a performance hit... will this tax the system/engine?

[@MonsterJuiced]

Ofcourse it will. That fluid system is very expensive

[@julienteral9140]

Didnt work for me :( couldnt find the " use physics assets collision" box in the fluid control emitter.

[@renderbucket]

Check user parameters tab in Unreal 5.1, It moved to that tab in 5.1

[@julienteral9140]

@@renderbucket Thanks ! Ended up just redoing the project 5.0 and it worked ;)

[@Jacoby_lel]

@@renderbucket There is no "use physics assets collision" box in the user paramers in unreal 5.1.
There is 'User' PhysicsCollision but thats something else :(

[@Jacoby_lel]

Well i just used actor tag: collider for my character for now.

[@julienteral9140]

@@renderbucket Still wasnt able to find it... I just have the "User Physics Collisions with "Defautl source" / "source actor / "mesh user parameter"

[@rojakstudios]

Great tutorial! Do you know if Niagara Fluids supersedes the Water System? I tried using the Water System with Fluid Sim on UE 5.0.3, but I couldn't get the character with interact with it. Also, do you know a way to add caustics to Niagara Fluids? Thanks in advance!

[@renderbucket]

Niagara fluids is not going to replace Unreals water system any time soon. Or the traditional way of cheating water with water surface plane and shaders.
The Niagara fluids system is actual FLIP Fluid simulations being performed in realtime, which is the reason why they are very demanding and heavy performance wise.
It may be used for certain FX but I think we are a least a handful of years away before our system hardware will be powerful enough to do those kinds of calculations/simulations in realtime on a larger scale.

[@rojakstudios]

@@renderbucket Ah, good to know. Thanks! I have to dig a little deeper to see why the Water System isn't working correctly.

[@ElmoPlayss]

It didn't work for me and I checked if I did everything right, which I did

[@erasernox2611]

Same here bro, it didn't work :(

[@navneet2649]

❤❤🪔🪔🙏🙏

[@phsin767]

damn man can you talking faster

[@ferlaur113]

it's not about talking faster, it's about not circonvoluting around! Please go straight to the points!

[@JohnRiversOfficial]

thanks love!