Transparent background and volume emission material #41482

New Issue

Kévin Dietrich · 2014-08-18T21:42:00+02:00

nanicoar commented

2014-08-18 21:42:00 +02:00

(Migrated from localhost:3001)

System Information
Win7 x64, 7970 Radeon

Blender Version
Broken: 2.70a # f93bc76

Short description of error

http://i.imgur.com/4fGn9uv.png

Rendered result to the left, preview and expected result to the left.

Independently confirmed by two users in #blender.

Exact steps for others to reproduce the error

Press Ctrl-Z in the 3D view to the right and F12.

(Drag-and drop doesn't work with IceWeasel in this web app, Pale Moon won't do this web-app's CSRF tokens, and Chromium has withered away.) Here is a link to pasteall.org http://www.pasteall.org/blend/31066

Do do it manually, assign Material > Volume > Emission to an object and set Render > Film > Transparent.

**System Information** Win7 x64, 7970 Radeon **Blender Version** Broken: 2.70a # f93bc76 **Short description of error** http://i.imgur.com/4fGn9uv.png Rendered result to the left, preview and expected result to the left. Independently confirmed by two users in #blender. **Exact steps for others to reproduce the error** Press Ctrl-Z in the 3D view to the right and F12. (Drag-and drop doesn't work with IceWeasel in this web app, Pale Moon won't do this web-app's CSRF tokens, and Chromium has withered away.) Here is a link to pasteall.org http://www.pasteall.org/blend/31066 Do do it manually, assign Material > Volume > Emission to an object and set Render > Film > Transparent.

nanicoar commented

2014-08-18 21:42:00 +02:00

(Migrated from localhost:3001)

Changed status to: 'Open'

nanicoar commented

2014-08-18 21:42:00 +02:00

(Migrated from localhost:3001)

Added subscriber: @nanicoar

Kévin Dietrich commented

2014-08-18 21:51:39 +02:00

Added subscriber: @kevindietrich

Kyle Horseman commented

2014-08-19 16:53:39 +02:00

Added subscriber: @KHorseman

Kyle Horseman commented

2014-08-19 16:53:39 +02:00

Here's a simple demo file that was used to confirm this behavior. VolumeEmissionTransparencyBugTest.blend

Here's a simple demo file that was used to confirm this behavior. [VolumeEmissionTransparencyBugTest.blend](https://archive.blender.org/developer/F105027/VolumeEmissionTransparencyBugTest.blend)

Sergey Sharybin commented

2014-08-20 10:55:51 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2014-08-20 10:55:51 +02:00

Sergey Sharybin self-assigned this 2014-08-20 10:55:51 +02:00

Sergey Sharybin commented

2014-08-20 10:55:51 +02:00

Blender converts images to the straight alpha before displaying them on the screen (because of the way how ogl is set up), which makes it look like there's no color in the transparent area.

Now, in order to see the values you need to composite the render result on something. Easiest way is to use RGB display mode in the image editor which would composite the render onto the black background.

For now it's not considered a bug, it's just how alpha works in blender. Thanks for the report anyway.

Blender converts images to the straight alpha before displaying them on the screen (because of the way how ogl is set up), which makes it look like there's no color in the transparent area. Now, in order to see the values you need to composite the render result on something. Easiest way is to use RGB display mode in the image editor which would composite the render onto the black background. For now it's not considered a bug, it's just how alpha works in blender. Thanks for the report anyway.

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Transparent background and volume emission material #41482