Maniphest T75605

Rendering fire on a transparent background produces a blank picture
Closed, Duplicate
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Assigned To
None
Authored By
Vladimir (Vladimir7527)
Apr 11 2020, 9:02 AM
Tags
  • BF Blender
  • Render Pipeline
Subscribers
Richard Antalik (ISS)
Vladimir (Vladimir7527)

Description

System Information
Operating system: Windows 10
Graphics card: NVIDIA GeForce GTX 1070 (Gigabyte)

Blender Version
Broken: 2.82a

Short description of error
Rendering a fire, explosion or glow gives a completely empty picture if you use a transparent background. I flipped through different file formats, such as PNG, Tiff, EXR, they all do not work. If you open the rendered file in a graphics editor, then there are RGB channels in it, and the alpha channel is completely empty.

Exact steps for others to reproduce the error
See attached file.

fire.blend787 KBDownload

Related Objects

Event Timeline

Vladimir (Vladimir7527) created this task.Apr 11 2020, 9:02 AM
Richard Antalik (ISS) added a project: Render Pipeline.Apr 14 2020, 3:48 PM
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).

I can reproduce issue in this file. But I can render flame on transparent background when using default scene and applying quick smoke+fire on cube.
I noticed high Z depth value, so I added plane mesh behind fire, and could render it without problem.

This very much looks like a duplicate of T68346, so I wil close this as such. if you look at T68346 are some workarounds, Not exactly sure how applicable to your use case.

Richard Antalik (ISS) closed this task as a duplicate of T68346: Volumetric object not taking into account by cycles depth/mist pass.Apr 14 2020, 3:48 PM