Cycles smoke has blocky shapes inside #67356
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Reference: blender/blender#67356
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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. smoke_blocky_bug.blend
Added subscriber: @steveernst117
Added subscriber: @ZedDB
The result seems to be the same for me in 2.79 and 2.8.
Please retry with the latest beta build from here: https://builder.blender.org/download/
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.
Added subscriber: @dark999
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
Added subscriber: @comvico
Same here. In addition the shadows appear broken. WIN 10 Blender 2.8 stable
Added subscriber: @Beaug
Both stable 2.8 and beta 2.81 have blocky shadows:
2.8
2.81
Is there a date when this will be fixed? Otherwise, I have to go back to 2.79 for VFX production, which is fine :).
Added subscriber: @brecht
Added subscriber: @mano-wii
Changed status from 'Confirmed' to: 'Archived'
I updated the file to work inmantaflow.
Here is the result on Eevee:
Here is the result in Cycles:
The result seems to be matching.
That "lines" in Cycles' smoke is an effect of the chosen "Step Size" (0.1 by default).
It's not a bug -> https://docs.blender.org/manual/en/dev/render/cycles/render_settings/volumes.html
Closing then.