- User Since
- Jan 6 2019, 4:50 PM (127 w, 2 d)
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May 8 2021
Mar 3 2021
Feb 1 2021
Unfortunately, I'm not noticing a strong difference with Adaptive Time Steps disabled (in 2.91 Beta). I'll explore this with other simulations, though, to see if the results are any different. (upres is at 2 for this one)
Nov 6 2020
Little update here. I just tested this example file in 2.92 9a7da1242d9f, and the behavior seems a lot stranger. On the left, you see the imported VDB smoke, which hasn't been scaled or rotated, only translated to the left of the original simulation.
Yep, the example scene is looking a lot better! There are still some occasional lines, though:
Oct 23 2020
Oct 6 2020
A small update here. I was experimenting with different resolutions; and it certainly improves in quality as the upres factor is increased, but the noise still fails to follow the movement of the original simulation.
Sep 30 2020
@Richard Antalik (ISS) Yeah, I'm not sure if these are related issues, so I'll keep them separate for now to avoid confusion. Thanks!
Sep 25 2020
Sep 21 2020
Aug 11 2020
Aug 5 2020
By the way, I'm not encountering this issue anymore in blender-2.91.0 deb76548c108. For me now, the color changes seem to only affect newly emitted smoke, and this also applies to how it's rendered in Cycles. Can anyone confirm this?
Yep! Seems to be fixed now. Thank you @Sebastián Barschkis (sebbas) !
@Sebastián Barschkis (sebbas) Alright, I'm not encountering the issue anymore in 2.91.0 deb76548c108. Fuel seems to be animating properly now, at least for me.
Jul 27 2020
Jul 23 2020
By the way, here's the file I used for the 2.82 demo, just in case.
Jul 22 2020
@Sebastián Barschkis (sebbas) Thank you for the update! Unfortunately, I'm still seeing the problem in 2.90.0 607d745a79e0 . Though, in my opinion, it already seems less pronounced than in 2.83.2.
Jul 15 2020
Sorry for no updates here in the past months! I haven't ever been able to get this kind of expansion to be regular before or after Mantaflow was released, so I don't think this is particularly a Mantaflow bug. Also, I tried this in 2.90.0 and it looks like some smoke is moving into the emitter, despite the Force force-field trying to push it out.
Jul 14 2020
Just including a silly test of the Cycles renders. Nothing seems to have changed there, regardless of cache types. (blender 2.90.0 f319eec88186 )
This bug seems to be behaving a bit differently in 2.90.0 f319eec88186 . For one, the fire completely stops moving (but doesn't necessarily disappear) when Fuel is set to 0, while the rest of the smoke progresses at a normal speed.
Jul 13 2020
Oh, thanks for reminding me to check this one! Unfortunately, it looks like it got more complicated. In both 2.83.2 and 2.9 Alpha (f319eec88186), the bug is gone when it's simulated using Replay type cache (though with several glitches before the first keyframe, probably related to caching). But when it's simulated in Modular or Final/All, the bug is still there. The color changes won't be visible in the viewport, but, if rendered in Cycles, the whole plume of smoke changes color at once, instead of just the newly emitted smoke.
Jul 9 2020
For some reason, in the newest build of 2.9, the simulation isn't at all visible after baking the noise, so I tried this on a previous build instead: 2.90 - c8060a78fdf3 . And, yes, unfortunately the issues persist.
The smoke moved a lot slower in 2.9, so I ended-up using a wind force-field to really accelerate it.
By the way, these issues were also present in 2.82.0
Jul 8 2020
Jul 6 2020
May 16 2020
@Everton Schneider (eversimo) You're right, 2.90 alpha seems to have the issue fixed with force fields. If smoke/flame Vorticity are the only properties influenced by this bug, it's probably not significant anymore, in my opinion. So, I'm glad to see this pretty much resolved!
May 13 2020
@Everton Schneider (eversimo) That's strange. I just tested in 2.83 50ef801a79b5, the issues still persist there.
May 12 2020
An unqualified guess here, so please correct me if I'm wrong! But I suppose this might be due to Blender treating this as if no more pressure is being added to the smoke. So, despite the insistence of even velocity, the smoke can't expand properly. However, due to the constant emission of new particles or the fact that Flow Behavior is set to Inflow, I believe it follows that more pressure should be added over time.
Mar 14 2020
Feb 19 2020
Feb 15 2020
Feb 7 2019
My apologies. I forgot to include the fact that "unborn" and "Dead" need to be disabled in the Particle Instance modifier. I have tested this with the newest version of 2.79 and it seems to be working just as fine as the previous versions. In the recent builds of 2.8, however, it doesn't work properly.