A Mix Shader bug in EEVEE #85909

Closed
opened 2021-02-23 05:02:42 +01:00 by yidus · 9 comments

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40

Blender Version
Broken: version: 2.92.0 Release Candidate, branch: master, commit date: 2021-02-22 12:21, hash: e497c1b93c
Worked: (newest version of Blender that worked as expected)

Short description of error
When I make a Mix Shader with a Holdout node and Principled BSDF,The function of mask cannot be realized.

Exact steps for others to reproduce the error
1 Create a new scene and choose a geometry.
2 Open Shader Editor.
3 Add a Mix Shader
4 Add a Holdout Shader
5 Add a Principled BSDF
6 conenct Principled BSDF and Holdout to Mix Shader, then connect this Mix Shader to Material Output.
7 change the veiwport shading to Rendered.
8 Drag the Fac value we will find the function of mask cannot be realized.
Please check the sample file.Mix Shader bug.blend
QQ.png

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40 **Blender Version** Broken: version: 2.92.0 Release Candidate, branch: master, commit date: 2021-02-22 12:21, hash: `e497c1b93c` Worked: (newest version of Blender that worked as expected) **Short description of error** When I make a Mix Shader with a Holdout node and Principled BSDF,The function of mask cannot be realized. **Exact steps for others to reproduce the error** 1 Create a new scene and choose a geometry. 2 Open Shader Editor. 3 Add a Mix Shader 4 Add a Holdout Shader 5 Add a Principled BSDF 6 conenct Principled BSDF and Holdout to Mix Shader, then connect this Mix Shader to Material Output. 7 change the veiwport shading to Rendered. 8 Drag the Fac value we will find the function of mask cannot be realized. Please check the sample file.[Mix Shader bug.blend](https://archive.blender.org/developer/F9829341/Mix_Shader_bug.blend) ![QQ.png](https://archive.blender.org/developer/F9829353/QQ.png)
Author

Added subscriber: @yidus

Added subscriber: @yidus
yidus changed title from A Mix Shader bug to A Mix Shader bug in EEVEE 2021-02-23 05:03:24 +01:00

Added subscriber: @ZTR

Added subscriber: @ZTR

That is not a bug, You need change blende mode.
{F9833858, size=full}

Use Backface culling.
kép.png

Turn off show backface.
kép.png

That is not a bug, You need change blende mode. {[F9833858](https://archive.blender.org/developer/F9833858/Alpha_blend.png), size=full} Use Backface culling. ![kép.png](https://archive.blender.org/developer/F9833881/kép.png) Turn off show backface. ![kép.png](https://archive.blender.org/developer/F9833996/kép.png)
Member

Added subscriber: @lichtwerk

Added subscriber: @lichtwerk
Member

Changed status from 'Needs Triage' to: 'Needs User Info'

Changed status from 'Needs Triage' to: 'Needs User Info'
Member

Thx checking @ZTR!

Waiting for confirmation, if this is working for @yidus as well.

Thx checking @ZTR! Waiting for confirmation, if this is working for @yidus as well.
Author

Thank you , it works. I used to use blender 2.83 all the time. This material doesn't need to be set like this in 2.83. Maybe blender2.92c eevee render has performance optimization.

Thank you , it works. I used to use blender 2.83 all the time. This material doesn't need to be set like this in 2.83. Maybe blender2.92c eevee render has performance optimization.
Member

Changed status from 'Needs User Info' to: 'Resolved'

Changed status from 'Needs User Info' to: 'Resolved'
Philipp Oeser self-assigned this 2021-03-08 08:43:51 +01:00
Member

Thx getting back, will close then.

Thx getting back, will close then.
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Reference: blender/blender#85909
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