Blocky artifact on VDB inside a principled volume

Support Lighting and Rendering
1

Hello folks, i have a tiny problem that’s bothering me a bit.
I’m trying to make my dragon do some steam while breathing but it get me a blocky result
image

The more sample i add the more visible this get, i’m scared it will be even more visible in the animation.

This blocky artifact disappear as soon as i remove my volumetric block that cover all the scene

Here is what the smoke simulation looks like without the principled volume.:

image
image284×511 42.7 KB

I tried:
More volume sample
More transparent sample
some other stuff i dont remember…

Any Ideas is welcomed :slight_smile:

2

I think there’s a resolution setting for your volume that should be changed.

3

There are several reports of blocky artefacts with VDBs:

https://developer.blender.org/search/query/6XBtdlm8qufM/#R

I felt that pain several times too and hope that one day they’ll be gone :slight_smile:

4

Thank you for your answer !
From close the vdb seems pretty detailled
image

Im trying with a better resolution just to confirm !

andd
Still no :frowning:
image

5

Thank you for your answer :slight_smile:
Yes i have seen some of thoses reports. I guess I’ll just find another way

I hope so too!

6

hi,

have you tested with higher transparency values?

image

7

Hello !
Yes, same result

8

too bad,

I also had this once I got the boxes when several VDB overlapped, it has become better with increasing the transparency.

9

I found a solution if you still need it

10

Someone else might need that solution, if you care to share.

1 Like
11

Here you go

tutorial
tutorial2501×1231 1020 KB

4 Likes
12

Does not work. Increasing transparent samples does.