Smoke simulation rendering issues when enable Render Transparent #42718

New Issue

Thomas Wilmot · 2014-11-25T06:04:55+01:00

Thomas Wilmot commented

2014-11-25 06:04:55 +01:00

System Information
Ubuntu 14.04, NVIDIA GTX 680 x2
Intel Core i7-4930k

Blender Version
Broken: 2.72b 9e963ae
Worked: Unknown

When you have an emission shader on a volume and use an attribute node set to either "density" or "flame", when "transparent" is enabled in the render panel, it renders in the viewport but doesn't render in the render window. When you don't enable "transparent" it renders fine. Render device is set to CPU.

Exact steps for others to reproduce the error // Blender file also offered
0. Select the Cycles renderer

Set up a simple smoke simulation.
Apply Material to domain with the Attribute node with value "density" fac plugging into an emission node strength, then the green node connecting to the volume on material output.
Render in viewport, confirm fine, render in Render window, confirm fine.
Enable "Transparent" in render settings.
Render in Viewport, see fine.
Render in Render window
Cry :'(

flamebug.blend

**System Information** Ubuntu 14.04, NVIDIA GTX 680 x2 Intel Core i7-4930k **Blender Version** Broken: 2.72b 9e963ae Worked: Unknown When you have an emission shader on a volume and use an attribute node set to either "density" or "flame", when "transparent" is enabled in the render panel, it renders in the viewport but doesn't render in the render window. When you don't enable "transparent" it renders fine. Render device is set to CPU. **Exact steps for others to reproduce the error** // Blender file also offered 0. Select the Cycles renderer 1. Set up a simple smoke simulation. 2. Apply Material to domain with the Attribute node with value "density" fac plugging into an emission node strength, then the green node connecting to the volume on material output. 3. Render in viewport, confirm fine, render in Render window, confirm fine. 4. Enable "Transparent" in render settings. 5. Render in Viewport, see fine. 6. Render in Render window 7. Cry :'( [flamebug.blend](https://archive.blender.org/developer/F126371/flamebug.blend)

Thomas Wilmot commented

2014-11-25 06:04:56 +01:00

Changed status to: 'Open'

Thomas Wilmot commented

2014-11-25 06:04:56 +01:00

Added subscriber: @ThomasWilmot

Thomas Wilmot commented

2014-11-25 06:13:31 +01:00

Also tried on a version built from source today, bug still present.

Sergey Sharybin commented

2014-11-25 10:14:26 +01:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2014-11-25 10:14:26 +01:00

Sergey Sharybin self-assigned this 2014-11-25 10:14:26 +01:00

Sergey Sharybin commented

2014-11-25 10:14:26 +01:00

This is just a visualization problem in the image editor of colors with zero alpha and color channels present in the image. To see such situations properly the image need to be alpha-overed on top of another one. but to do it seamlessly in the image editor would require re-considering some parts of color pipeline.

This is in my TODO for 2.73. So thanks for the report, but archiving it now.

This is just a visualization problem in the image editor of colors with zero alpha and color channels present in the image. To see such situations properly the image need to be alpha-overed on top of another one. but to do it seamlessly in the image editor would require re-considering some parts of color pipeline. This is in my TODO for 2.73. So thanks for the report, but archiving it now.

Thomas Wilmot commented

2014-11-25 11:16:45 +01:00

Awesome, there's a work around! Thanks so much for your time! :D

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Smoke simulation rendering issues when enable Render Transparent #42718