Issue rendering vdb Tweet

[aperte]

Hi, I am having a hard time figuring out how to render vdb in octane blender.
I am doing this tutorial step by step : https://www.youtube.com/watch?v=jq1mYH59UCM
I export some vdb flames from embergen, import, shade it etc...
The problems are :

1- I am importing a sequence file but octane doesn't seem to see it as such, while on the classic/not shaded viewport, the vdb sequence plays correctly. I can see only the vdb frame that was there when i switch to the octane viewport, and it stays still when i scrub through the timeline, while on the not shaded viewport the animation plays fine.

2- When I render, the flames doesnt show up in the render, while they are there in the octane viewport. Or they are shaded very differently to the point I can barely see them, I am not exactly sure.

Any help or advice would be great !

[linograndiotoy]

Can you please share a VDB file which doesn't work for you?

Also, please always specify the version you're using:

viewtopic.php?f=32&t=82311

[aperte]

Hi, Thank you for your reply,
I am using Blender_Octane_Edition_2023.1_28.5_stable for windows
Here is a few frames of the vdb file that doesnt work for me
https://drive.google.com/drive/u/0/fold ... uW8EsOcITd
I tried on two computers and different builds and the problem remains the same.
I read from a c4d user who had a similar issue there was an "update volumes" somwhere but couldnt find it in blender...

Also, I have some vdb clouds in the scene wich makes the renders a lot slower, what can be a good way to optimize the volumes rendering without losing too much quality?

[linograndiotoy]

Hi!

I've downloaded one of the VDB files and it simply doesn't show up in Blender, so this doesn't seems to be an Octane issue but more a Blender one.

How did you generate the VDBs?

[aperte]

Hello, thank you for looking into this,

I generated them with embergen, and at first they didn't show up for me either until I selected a different grid (flames) in the data properties tab and applied a shader, scaling them up might also help.

I might have generated the vdb with some wrong settings \ attributes since I am quite a newbie, but they show up just fine in cycles and play the sequence as they should.

I am 99% sure the bug is "octane related", I suspect the some settings of my blender octane are off or broken because I just tried in a new project file with a jangaFX free vdb and the issue is the same.

Maybe some setting isn't activated or a link got broken sowhere, I tried to re-install octane for blender but the issue remains.

I am a bit desperate my project is due in 10 days and relies heavily on vdbs... I am in the process of re shading everything in cycles but I really wish I didn't had to, I really liked the look I had in Octane and I feel like my issue has a simple fix but I can't seem to find it...

I really appreciate the time you took to look into it, thanks a lot, let me know if you think about anything I could try to fix it.

Have a good day !

[linograndiotoy]

I've tried your examples in Cycles as well, with no success.
Could you please send me a Cycles scene and a VDB which is working for you?

[aperte]

Hi, I added two blend files, one from octane and one from cycles showing the issue over 7 frames

https://drive.google.com/drive/u/0/fold ... uW8EsOcITd

I found a quick fix by adding a volume displace modifier, the animation now works and renders in octane but it isn't optimal as i loose the octane properties panel in the volume settings.

[linograndiotoy]

So, it works here, but we definitely need to fix the frame update.

Thanks!

[linograndiotoy]

Which is now fixed.