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Cycles smoke has blocky shapes inside
Open, Confirmed, MediumPublic


System Information
Operating system: Windows 10
Graphics card: 2x GeForce GTX 660 TI

Blender Version
Broken: 2.80 Release Candidate 2
Worked: 2.79

Short description of error
Blocky shapes and lines visible inside smoke when rendering with Cycles.

Exact steps for others to reproduce the error
Create a smoke sim from particles and set up shader. When increasing density in the shader, strange blocky shapes and lines become apparent inside the smoke (rotating the view may help you see them better). These are NOT the typical artifacts from adaptive domain - these look more like shadows inside the smoke. I'm including an example file.



Event Timeline

Sebastian Parborg (zeddb) triaged this task as Needs Information from User priority.

The result seems to be the same for me in 2.79 and 2.8.

Please retry with the latest beta build from here:
Is the result different if you use CPU rendering?

No, with CPU the result is the same.
I tried it with the newest build as you suggested, but still got the same problem. I'm including a screen grab so you can see what I'm getting.

I get the same thing with the latest 2.79 build:

But you don't get this with 2.79 release?

No, my build of 2.79 is older. Splash screen says it was built on 2018-03-22. Guess I forgot to get a newer one.

But you can 100% confirm that this doesn't happen with the older release?

I can confirm. Here's a screengrab of the result I get in my 2.79 build.

Sebastian Parborg (zeddb) raised the priority of this task from Needs Information from User to Confirmed, Medium.

this is pretty strange i save newly this test file and then i reopen in on 1 month old blender, smoke simulaed have difference, same frame 36

all this on linux Blender 2.80-19aa873f7002 (2019-07-23) AMD FX8350, 16GB DDR3, GTX690 2+2 GB VRam- Nvidia drivers 430.34