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The flame of the Mantaflow Domains disappears when you make an append of the baked object.
Confirmed, NormalPublicBUG


System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1060 3GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 432.00

Blender Version
Broken: version: 2.82 (sub 6), branch: master, commit date: 2020-02-11 14:45, hash: rBc939b4df18e9
Worked: (optional)

Short description of error
When simulating fire with Mantaflow, although the fire is baked and is correctly represented in the scene in which it was created, it disappears when an append of the domain is performed in a new scene.

Exact steps for others to reproduce the error
Open the default scene.
Select the cube.
With Object / Quick Effects, create smoke.
Select the Flow Cube and in Flow Type activate Fire + Smoke.
In the Domain Cache activate Data File Format = OpenVDB.
Simulate and bake the animation.
Save the file
Open a new file.
Make an append of the Domain.
The problem persists in the different render engines.

Event Timeline

Germano Cavalcante (mano-wii) changed the task status from Needs Triage to Needs Information from User.Thu, Feb 13, 7:11 PM

I cannot reproduce the problem. The fire appears normally after I have imported the objects.

Operating system: Windows-10-10.0.18941 64 Bits
Graphics card: Radeon (TM) RX 480 Graphics ATI Technologies Inc. 4.5.13559 Core Profile Context 26.20.12028.2

Even if you used a recent build, could you test it with today's daily build?

There is a chance that this problem has already been fixed.
Make sure to delete the pre-existing cache files.

The problem persists but I have found a peculiarity.

When Append only the Domain only Imports the smoke, but if you import the Domain and the Flow then the fire works. It happens with OpenVDB and UniCache.
It doesn't make much sense, once the simulation is in cache, you shouldn't need the Flow. If smoke does not need it, it makes no sense that fire does.
If you import the two objects separately it also works.

I've tried it on three different computers, yesterday on two and today on another.


Germano Cavalcante (mano-wii) changed the task status from Needs Information from User to Needs Triage.Thu, Feb 13, 8:05 PM
Richard Antalik (ISS) changed the task status from Needs Triage to Confirmed.Thu, Feb 13, 8:39 PM

Can confirm with version: 2.83 (sub 2), branch: master, commit date: 2020-02-13 17:12, hash: rBb6572c5430c5

Bastien Montagne (mont29) changed the subtype of this task from "Report" to "Bug".

Playing a little more I have seen that the problem has nothing to do with the import, but with the emitter of the fire. The simple fact of eliminating the Fluid Flow (Fire + Smoke), makes the fire disappear and only the smoke remains in de Domain, even if the Cache is already stored.
In the same scene you can copy and instance the Domain as much as you want, but the moment you delete the Flow, the fire of all the copied Domains disappears.