FIX VDB PROBLEMS in UNREAL ENGINE 5

[@postprocessed]

Here are console variables: r.heterogeneousvolumes.Maxtracedistance r.heterogeneousvolumes.depthsort 0 r.heterogeneousvolumes.indirect lighting 1 r.pathtracing.heterogeneous volumes 1 r.SparseVolumeTexture.Streaming.PrefetchMipLevelBias

[@travismcc]

Note: for translucency issues, as of 5.4 if you have a particular item that is clashing with your VBD, simply go into the material of said item and in the details panel of the main node -> translucency -> advanced -> translucency pass -> Before DOF. (by default it is set to after DOF).

[@TheDragoy]

Thanks for the advice! It came in handy

[@cyrferra]

A trick that unlocked the problem for me: activating and increasing the anti-aliasing. In Movie Render Queue, click on Unsaved Config and on the "+ Setting" and on Anti Aliasing and Here are my settings: Spatial Count 5, Temporal Count 5, Override Anti Aliasing checked, Anti Aliasing Method Multisample Anti-Aliasing (MSAA) This method works if the VDB takes a second to be displayed on some frames, because it "forces" the rendering to take a little more time, if there are still images without VDB increase the values beyond 5 and it should work eventually

[@Jackdraws]

You are a fucking GOD! This works! I was struggling with the flickering in sequencer as the renderer was too fast for the VDB to actually fully load. This needs to be pinned!

[@pedromasa]

After struggling with FUKGN Unreal 5.4 and countless console variables, I finally found the FUKGN solution... In the "Outliner," select your "Heterogeneous" object, look for the "Streaming MIP BIAS" option, and set it to negative values. -4 works for me. The folks at Unreal sure have a sense of humor!, after a couple of hours, I wasn’t laughing as much!

[@melsayed.modesign]

Fantastic and helpful tutorial! Could you please make an episode about the difference between Lumen, Path Tracing & Ray Tracing, and how to set unreal to render only in path tracing or only ray tracing or only lumen? Because camera has settings for path tracing, ray tracing and lumen, PostProcessVolume also has and the project setting has as well, so all of them are mixed which makes confusion. Thank you so much for all amazing episodes :)

[@postprocessed]

oh, I kinda should do it, but very busy at the moment. eventually I will get to it)

[@Xpayn3]

omg your a legend I could never make it work with ultra dynamic sky but this fixed it!!!

[@postprocessed]

happy to hear that!

[@mae2309]

cant wait for your car course..!! waiting!! hahahaha

[@th-redattack]

Thank you your tutorials are really unique

[@nomastor2602]

My window is in front of my niagara fluid.Do you have any solution?

[@ShowHall]

nice and very useful

[@aletergut3482]

Hi there, thanks for the video! Is there a way to see the vdb in lumen reflections?

[@postprocessed]

Hm, I think not yet... Maybe with ray-tracing reflections

[@re5128]

Very nice man! Question: Do you have also problems of distroted VDB under pathtracing. Especially when you scale them up or douplicate them? Thank you!

[@postprocessed]

well yes! recently I had that issue when you try to add VDB with flames it's just glowing insanely and for some reason duplicating or reflecting in the frame for some reason. Found out that changing combustion and blackbody amount in embergen helps to avoid it or increasing VDB resolution slightly

[@aryanbarure1479]

Quick question here. My vdb temprature is wayyyy off the mark compared to where my smoke is. Is there a reason for that? for eg. is my smoke is at point a then my temprature/fuel is at point b

[@dmitrromand5870]

There is no clear reflections of heterogeneous volumes in lumen. Only fake fresnel reflections we can see in extreme angles of view to a surfaces. Can this problem be fixed now in version 5.4? I also noticed that heterogeneous volumes can`t receive shadows from static meshes on itself. Wondering if you have a fix for this. Thanks!

[@bassninja8592]

Hey @Post Processed I noticed that VDBs are very choppy and stuck when Time Dilation is applied. Looks like it is not interpolating especially during slowMo in sequencer. Wondering if you have a fix for this. Thanks for all the content you've been making man. Can't thank you enough. Please keep em coming.

[@postprocessed]

hey man! This is problematic as you need your VDB sequence also be higher framerate like 60 or 120. That will lead to huge size of the vdb which can cause issues. I think better would be to create a "slow mo" animation and pass this slowed animation to Embergen\Houdini. This is a downside of simulation approaches. That you really need to bake your final animation slow it down/speed up and when it is final - only after that create a sim that will suit your animation

[@bassninja8592]

@@postprocessed Thanks a lot Bro. Will look into this. Cheers!

[@sonhoang-sq9fw]

Thank alot. It what I finding.

[@MADMOVIESINC]

Hey, Man! I'm back! Question, I have two VDBs that I want to play right on top of each other. How can you sort or blend them, or can't you?

[@pixelrise]

Thank you my friend

[@postprocessed]

Thank you. But we don't mention my name here)

[@albertozavala9017]

5.4 Heterogeneous Volumes not working with Path Tracing, any fixes? This worked with 5.3, tried it before on your videos. Thank you for any help.

[@TorreAltaFilms]

Very useful! Thanks. I’m using a vdb cloud in VR but it only renders in the left eye. Any idea? I’m using ue5.3 with lumen enabled and Meta Quest2.

[@postprocessed]

hey bro, sorry I don't work with VR and don't have Meta Quest or any VR glasses to test it

[@TorreAltaFilms]

Oh, ok no problem! Thanks

[@rongqiao7532]

@@TorreAltaFilms The same problem occurs in pico, have you solved the problem?

[@TorreAltaFilms]

@@rongqiao7532 Hi, no I haven’t. So, I’m using a Niagara particle system to do a similar effect.

[@JoshLange3D]

Can you do a tutorial on how you made the tire smoke in the red bull video?

[@postprocessed]

Oh man, that was done in Houdini, and I am not familiar with it. My colleague made it

[@JoshLange3D]

@@postprocessed ah ok didn't realize it was a team effort. Very cool though

[@MADMOVIESINC]

Thanks again for this video. I come back to it all of the time. Is there a place (in the config file) to put these commands so that I don't have to type them in every time that I open my scene? If so, which file and where should it go?

[@postprocessed]

Its engine.ini file in project folder. It should be in “rendering” part

[@niro2960]

THanks man this is great

[@postprocessed]

Glad you like it!

[@sachak]

Hey, thanks for this tutorial. I bought Cloud forge as I am trying to do a fly over of trees on a mountain, I am rendering using Path Tracing and a still frame looks perfect, soon as I render out a sequence I get flickering volumes, the clouds are made from VDB's. I set the volume very low so they look like white wisps of fog embedded in the trees and just above. They flicker terribly in an actual render. Any help would be seriously appreciated.

[@postprocessed]

Hey! I also experience issues with cloud forge in PT, not sure what is the problem currently, if I manage to find a fix I will post it, but currently have no time for debugging :(

[@chiya_mohammed]

Thanks man .

[@Darloud]

Thanks for tips. Need to ask if i use this in console command in viewport or i use this command in render Que it has a same effect rigth?

[@postprocessed]

Console command in viewport will affect only current session. If you restart UE it will be reset to default. So its better to save it in Movier Render Queue preset

[@Darloud]

@@postprocessed thanks! Don't know that.

[@linnhmaw]

Hi thanks for the tutorial. I cant see my vdb at all..any reason why?

[@postprocessed]

maybe density is too low? Did you enable checkbox "playing"?

[@linnhmaw]

@@postprocessed yeah I got it working. The density was in fact too low to see. Thanks so much for your help.

[@xbad3d]

Thank for your video, but I'll give you another question to investigate. Vdb is rendered for only one eye in VR, how do you think is it possible to get this worked correctly?

[@postprocessed]

oh... sorry I don't work in VR, so unfortunately I can't help you with this one :(

[@TheMandark1000]

can u help me? Rain does not appear in the render unreal engine 5 when i take image not video? what can i do?

[@postprocessed]

Hey dude! When you render still frame you need some “engine warmup frames” so it can spawn rain particles. When you set movie render queue, in “anti aliasing” add some “engine warmup frames” like about 50. Should work!

[@postprocessed]

Do you render in lumen or path tracing?

[@TheMandark1000]

@@postprocessed its working thx very much u r clever man

[@marcogrob3899]

Hello Master! I have problems importing hires VDB's into Unreal 5.3. Low res works but not hires. The import takes forever which I can understand but then the Converting open VDB stops at 99% or 100% and stays there forever without results. A couple of times my engine crashed importing Embergen VDB. With a Rtx 4090 and a threadripper 64 the hardware should be ok....What could it be?? Best and Thanks Marco

[@postprocessed]

Well I found out VDB should be around 10GB max size.... If you have it bigger that that size, well try to lower the voxel count in your simulations. Otherwise yes, it get's stuck and crashes

[@needse1]

still flickering for me :(

[@snowyy9884]

I have a problem where my voxels in unreal has holes in them

[@xionghe6706]

How to render the alpha channel of a VDB？

[@postprocessed]

Ooof, I dont think it is supported yet… but maybe it is possible with stancil layer?

[@JasonKey3D]

👍

[@АртемРэдман]

Привет , подскажи пожалуйста, почему если я затаскиваю vdb в секвенсер то он там воспроизводится и прекрасно проигрывается , а когда начинаешь рендерить или включаешь gamemode то он перестает работать и его вообще не видно.Галочки playing и looping стоят, Все делаю как ты показывал

[@Druneg]

пшел отсюда, дурачок

[@Liujianghua]

This guy is so handsome

[@postprocessed]

aaawww ))

[@djtc2093]

Hey man, great video. I have this weird problem though, when I place a VDB far away from the centre of the map, the shadow and effect degrades heavily... Any idea? I've shown an example below. kzbin.info/www/bejne/mnmlXnaZmbuAmcU

[@DeathDong]

When I try to import vdb it gets to 99% then unreal crashed.. have searched the forums and tried several fixes but cannot figure it out. Anyone have any guesses?