Mix/Add nodes breaks Eevee AO render pass if one socket is unfilled. #88779

New Issue

Cici · 2021-06-03T07:00:28+02:00

Cici commented

2021-06-03 07:00:28 +02:00

System Information
Operating system: Windows-10-10.0.16299-SP0 64 Bits
Graphics card: GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 419.67

Blender Version
Broken: version: 2.92.0, 2.93.0, 3.0 0efb627bbd

Short description of error
In Eevee, any material which contains an add shader node will be broken in the AO pass, if second socket is invalid, leaving the material either entirely black or white.
This is annoying if you're creating entirely black materials by leaving a socket empty.

Exact steps for others to reproduce the error

Add a mesh, give it a material.
Put either an an add shader node or a mix node into the material somewhere, but only fill one of the input sockets
Enable AO with Eevee, and look at the AO render pass in render view. In 2.92, the object will be completely black, in 2.93 it will completely white.

Render the scene with the file given.
For the second case, render by swapping the socket inputs of the "Add Shader" node.
T88779_mine.blend

Additional example images.
(2.93)
F10155389
F10155391

(2.92)
F10155385

**System Information** Operating system: Windows-10-10.0.16299-SP0 64 Bits Graphics card: GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 419.67 **Blender Version** Broken: version: 2.92.0, 2.93.0, 3.0 0efb627bbd **Short description of error** In Eevee, any material which contains an add shader node will be broken in the AO pass, if second socket is *invalid*, leaving the material either entirely black or white. This is annoying if you're creating entirely black materials by leaving a socket empty. **Exact steps for others to reproduce the error** - Add a mesh, give it a material. - Put either an an add shader node or a mix node into the material somewhere, but only fill one of the input sockets - Enable AO with Eevee, and look at the AO render pass in render view. In 2.92, the object will be completely black, in 2.93 it will completely white. ---------------- - Render the scene with the file given. - For the second case, render by swapping the socket inputs of the "Add Shader" node. [T88779_mine.blend](https://archive.blender.org/developer/F10181417/T88779_mine.blend) ![image.png](https://archive.blender.org/developer/F10181120/image.png) ![image.png](https://archive.blender.org/developer/F10181118/image.png) Additional example images. (2.93) [F10155389](https://archive.blender.org/developer/F10155389/image.png) [F10155391](https://archive.blender.org/developer/F10155391/image.png) (2.92) [F10155385](https://archive.blender.org/developer/F10155385/image.png)

Cici commented

2021-06-03 07:00:28 +02:00

Added subscriber: @Consta

Ankit Meel commented

2021-06-18 20:35:20 +02:00

Added subscriber: @ankitm

Ankit Meel commented

2021-06-18 20:35:20 +02:00

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

Ankit Meel commented

2021-06-18 20:35:20 +02:00

Please attach a simple blend file to show the issue.
Or see mine. I can't redo completely white object in AO pass if one input of mix shader is left empty.
macOS 10.14, 0efb627bbd

T88779_mine.blend

Please attach a simple blend file to show the issue. Or see mine. I can't redo completely white object in AO pass if one input of mix shader is left empty. macOS 10.14, 0efb627bbd ![image.png](https://archive.blender.org/developer/F10180542/image.png) [T88779_mine.blend](https://archive.blender.org/developer/F10180551/T88779_mine.blend)

Cici commented

2021-06-19 07:37:54 +02:00

After some fiddling with your file I've found that if any part of a shader tree has the bottom socket evaluate to an "invalid" material (IE from an empty shader input socket) AO will break on that material.
This does not occur if the top input is "invalid", AO will be fine regardless of input or lack of input.
This is true for both mix and add.

After some fiddling with your file I've found that if any part of a shader tree has the bottom socket evaluate to an "invalid" material (IE from an empty shader input socket) AO will break on that material. This does not occur if the top input is "invalid", AO will be fine regardless of input or lack of input. This is true for both mix and add. ![image.png](https://archive.blender.org/developer/F10181118/image.png) ![image.png](https://archive.blender.org/developer/F10181120/image.png)

Ankit Meel commented

2021-06-19 13:09:22 +02:00

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

Philipp Oeser removed the

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Mix/Add nodes breaks Eevee AO render pass if one socket is unfilled. #88779