Multiple Smoke Flow Colors Rendering Black when Flow Behavior is set to Geometry #78485

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Austin Hyde · 2020-07-01T03:28:40+02:00

Austin Hyde commented

2020-07-01 03:28:40 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 670/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.48

Blender Version
Broken: version: 2.83.1, branch: master, commit date: 2020-06-25 09:47, hash: 8289fc688b
Worked: 2.81 -- N/A, newer versions use fluid settings, but the old smoke sim worked as it should

Short description of error
Baking a smoke domain multiple smoke flow objects with flow set to "geometry" and each set to a color results in all of the smoke rendering black.

Create a smoke domain on any object and place two smoke flow objects inside the domain. Set the smoke color of the smoke flow objects to any color, and the flow behavior to "geometry" vs "inflow" or "outflow". Change the material on the domain object to a material without a surface bsdf but with a volume bsdf whose color is set to the color output of an attribute node with the Name property set to "color". Bake the sim and render, and you should observe that all smoke is black, as opposed to the colors set on the flow objects. This works correctly when the flow behavior is set to inflow (except on the first frame), so I'm guessing this has something to do with the initialization of the smoke.

smoke_multi_color_bug.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 670/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.48 **Blender Version** Broken: version: 2.83.1, branch: master, commit date: 2020-06-25 09:47, hash: `8289fc688b` Worked: 2.81 -- N/A, newer versions use fluid settings, but the old smoke sim worked as it should **Short description of error** Baking a smoke domain multiple smoke flow objects with flow set to "geometry" and each set to a color results in all of the smoke rendering black. Create a smoke domain on any object and place two smoke flow objects inside the domain. Set the smoke color of the smoke flow objects to any color, and the flow behavior to "geometry" vs "inflow" or "outflow". Change the material on the domain object to a material without a surface bsdf but with a volume bsdf whose color is set to the color output of an attribute node with the Name property set to "color". Bake the sim and render, and you should observe that all smoke is black, as opposed to the colors set on the flow objects. This works correctly when the flow behavior is set to inflow (except on the first frame), so I'm guessing this has something to do with the initialization of the smoke. [smoke_multi_color_bug.blend](https://archive.blender.org/developer/F8656147/smoke_multi_color_bug.blend)

Austin Hyde commented

2020-07-01 03:28:40 +02:00

Added subscriber: @Orangeflea

Germano Cavalcante commented

2020-07-01 21:26:49 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Germano Cavalcante commented

2020-07-01 21:26:49 +02:00

Added subscriber: @mano-wii

Philipp Oeser removed the

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Multiple Smoke Flow Colors Rendering Black when Flow Behavior is set to Geometry #78485