Mantaflow does not render flame when flow source is hidden from Renders #72192
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Reference: blender/blender#72192
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System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 388.13
Blender Version
Broken: version: 2.82 (sub 1), branch: fluid-mantaflow, commit date: 2019-11-26 22:21, hash:
0ca44974c9
Worked: (optional)
Short description of error
Mantaflow does not render the flame but only smokes of "fire + smoke" if the flow source is hidden from renders. I hide the source because it is just an emitter not intended to be visible in the final render.
Exact steps for others to reproduce the error
Select the cube in the default new project, create "quick smoke" then change the source flow type to "fire + smoke".
Select the domain object, bake data.
Increase Blackbody Intensity value of the Smoke Domain Material, like 10.
Render the effect, everything is as intended.
Select the flow source, uncheck "Show in Renders" in Objects properties - Visibility.
Free the domain data and bake again.
Render again, now the flame disappear. (Notably the flame is still visible in Rendered Viewport, but not the actual render.)
Enable visibility of the flow source, rebake the domain and everything is back to normal.
Added subscriber: @ifurkend
#74841 was marked as duplicate of this issue
Added subscriber: @StephenSwaney
If I understand your steps, you uncheck Show in Renders and the object does not show in the render but does show in the viewport. This sounds like expected behavior.
If you uncheck Show in Viewports, does it disappear?
The point is only the fire is not shown but the smoke still renders. How can such inconsistency be considered "expected"?
Regarding uncheck Show in Viewports, here's the table for you.
Edit: To clarify that I don't mean changing the visibility of the Domain object,
but the source object where fire/smoke/fluid is emitted from.
Indeed changing the visibility of the Domain is expected to affect the visibility of the fire and smoke,
this is consistent with Blender 2.7.
Back in Blender 2.7 to create the similar fire+smoke effect,
hiding the flow source from viewport and render does not prevent either the fire or smoke from being baked and rendered.
This makes the whole situation with Mantaflow so baffling.
Added subscriber: @JacquesLucke
Changed status from 'Needs Triage' to: 'Needs User Info'
Is that still an issue in the latest builds from https://builder.blender.org/download/?
If yes, please prepare a very simple .blend file that makes it easier to reproduce the issue.
Same issues on fluid-mantaflow-blender-2.82-ed32db06c124-windows64
Mantaflow report 2020 0116.blend
Changed status from 'Needs User Info' to: 'Needs Triage'
Changed status from 'Needs Triage' to: 'Confirmed'
Added subscriber: @JohnCox-3
Added subscriber: @cata_cg
Added subscriber: @ponomarovmax
Added subscriber: @Goury
Are there any plans to ever fix this?
Clearly this isn't how it supposed to (not) work.
It also makes preview useless, slowing down the workflow to stall.
Not sure if it's a proper solution but I found a way to hide the source and maintain the fire in the render.
Select Source -> Material Properties -> Surface -> Select "Transparent BSDF"
Alternatively, you can add an Emission shader in the Volume properties (Select Source -> Material Properties -> VOLUME-> Select "Emission") and set it's color to orange or yellow. This option just reduces the visibility of the source but not in all aspects.
Hope this helps!
Added subscriber: @simonurzua
Same issue here in Blender 2.83.0
Added subscriber: @Galib-Arrieta
Same problem here. Blender 2.83. I have a tried everything to get it working. Hiding the flow emitter only renders the smoke, the fire always remain invisible when rendering to an image or as animation.
Actually, a decent workaround is to add a Principled BSDF material to the flow emitter, and set Alpha to 0. Now I see the fire in the rendered image. This is a similar solution as suggested by @cata_cg .
Added subscriber: @gogo
I just ran into the same problem (after a quite time-consuming bake) and the workaround (making the inflow object visible) worked. I wish it wouldn't be necessary though. I unchecked visibilities (camera, diffuse, ...)
Added subscriber: @shamimurrahman19
The problem still exists in 2.83.3
This issue was referenced by
df28a68e70
Changed status from 'Confirmed' to: 'Resolved'
Added subscriber: @imaadityadas
I got the same problem and found out that if you disable the flow object from the view port and the render the flames are not visible
so if you re-enable to show the flow object the flames appears in the renders