Workbench problems with alpha channels #79085

New Issue

daniel da costa beyuma · 2020-07-19T20:19:50+02:00

2020-07-19 20:19:50 +02:00

{F8707108}System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Intel(R) HD Graphics 610 Intel 4.5.0 - Build 26.20.100.7263

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-18 16:26, hash: b8601b64c7
Worked: (newest version of Blender that worked as expected)

Short description of error

When I use the graphics engine workbench> Material properties> View port Display.
I choose a dark color to use as a transparency mask when the alpha value is: 1,000. It correctly displays the preview but when I just changed the example value 0.990 the render shows as if the value was the minimum. And when lowering the value to 0.000 the mask should be totally transparent but the render shows me as if it had a value between 0.300 to 0.500

Exact steps for others to reproduce the error
#79085.blend

Open file and render image

{[F8707108](https://archive.blender.org/developer/F8707108/alpha.png)}**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: Intel(R) HD Graphics 610 Intel 4.5.0 - Build 26.20.100.7263 **Blender Version** Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-18 16:26, hash: `b8601b64c7` Worked: (newest version of Blender that worked as expected) **Short description of error** When I use the graphics engine workbench> Material properties> View port Display. I choose a dark color to use as a transparency mask when the alpha value is: 1,000. It correctly displays the preview but when I just changed the example value 0.990 the render shows as if the value was the minimum. And when lowering the value to 0.000 the mask should be totally transparent but the render shows me as if it had a value between 0.300 to 0.500 **Exact steps for others to reproduce the error** [#79085.blend](https://archive.blender.org/developer/F8710198/T79085.blend) Open file and render image

daniel da costa beyuma commented

2020-07-19 20:19:50 +02:00

Added subscriber: @danieldacostabeyuma

daniel da costa beyuma commented

2020-07-19 20:21:26 +02:00

This comment was removed by @danieldacostabeyuma

*This comment was removed by @danieldacostabeyuma*

Richard Antalik commented

2020-07-21 05:43:35 +02:00

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

Forest Katsch commented

2020-08-27 19:43:21 +02:00

Added subscriber: @forestkatsch

Forest Katsch commented

2020-08-27 19:43:21 +02:00

I'm encountering the same issue in Blender 2.83.1 and Blender 2.91. It looks like the alpha clip is working properly, so the transparent rendering path is only used if the alpha is less than 1. However, it looks like the alpha is inverted when rendering (but not when using the viewport in render mode.)

Viewport (correct behavior):

Render result (incorrect behavior):

Reproduction file:
transparent.blend

OS: Windows 10 2004
CPU: AMD Ryzen 5 3600
GPU: nVidia RTX 2070S
Blender: 2.83.1 and 2.91 (buildbot a1f54be042)

I'm encountering the same issue in Blender 2.83.1 and Blender 2.91. It looks like the alpha clip is working properly, so the transparent rendering path is only used if the alpha is less than 1. However, it looks like the alpha is inverted when rendering (but not when using the viewport in render mode.) Viewport (correct behavior): ![viewport.png](https://archive.blender.org/developer/F8815748/viewport.png) Render result (incorrect behavior): ![render.png](https://archive.blender.org/developer/F8815750/render.png) Reproduction file: [transparent.blend](https://archive.blender.org/developer/F8815752/transparent.blend) OS: Windows 10 2004 CPU: AMD Ryzen 5 3600 GPU: nVidia RTX 2070S Blender: 2.83.1 and 2.91 (buildbot a1f54be0426e)

Clément Foucault commented

2020-09-14 01:20:20 +02:00

Closed as duplicate of #80603

Clément Foucault closed this issue

2020-09-14 01:20:20 +02:00

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Workbench problems with alpha channels #79085