Mute RGB to BW converter node doesn't work in Cycles rendered #70064

New Issue

Emmanuel LORANT · 2019-09-19T11:51:51+02:00

Emmanuel LORANT commented

2019-09-19 11:51:51 +02:00

System Information
Operating system: Windows 10 x64
Graphics card: 1060 + 1080 Ti

Blender Version
Broken: Last one : blender-2.81-741d7d60ed90-windows64
(example: 2.79b release)
(example: 2.80, edbf15d3c0, blender2.8, 2018-11-28, as found on the splash screen)
Worked: (optional)

Short description of error
As title says
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
Create a new material with a RGB to BW node. Mute it. It works in Look Dev mode, not in Rendered mode with Cycles (it works with EEVEE).

**System Information** Operating system: Windows 10 x64 Graphics card: 1060 + 1080 Ti **Blender Version** Broken: Last one : blender-2.81-741d7d60ed90-windows64 (example: 2.79b release) (example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen) Worked: (optional) **Short description of error** As title says **Exact steps for others to reproduce the error** Based on the default startup or an attached .blend file (as simple as possible). Create a new material with a RGB to BW node. Mute it. It works in Look Dev mode, not in Rendered mode with Cycles (it works with EEVEE).

Emmanuel LORANT commented

2019-09-19 11:51:51 +02:00

Added subscriber: @EmmanuelLORANT

Philipp Oeser commented

2019-09-19 12:32:46 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2019-09-19 12:32:46 +02:00

Can confirm.
#70064.blend

Can confirm. [#70064.blend](https://archive.blender.org/developer/F7758006/T70064.blend)

tom k commented

2019-09-19 12:33:17 +02:00

Added subscriber: @tomjk

tom k commented

2019-09-19 12:33:17 +02:00

Example file:

colorNodeMuteIssue.blend

Looks to affect pretty much any node that has colour or colour-like (i.e. vector) inputs and non-colour output.

edit: Apologies, does not affect normal map and vector displacement (muting pulls value from a different input).

Example file: [colorNodeMuteIssue.blend](https://archive.blender.org/developer/F7757995/colorNodeMuteIssue.blend) ![colorNodeMuteIssue.png](https://archive.blender.org/developer/F7757999/colorNodeMuteIssue.png) Looks to affect pretty much any node that has colour or colour-like (i.e. vector) inputs and non-colour output. edit: Apologies, does *not* affect normal map and vector displacement (muting pulls value from a different input).

Jacques Lucke commented

2019-09-19 12:35:08 +02:00

Added subscribers: @fclem, @brecht, @JacquesLucke

Jacques Lucke commented

2019-09-19 12:35:08 +02:00

Ah, actually, I'm not sure if this is a bug in eevee or Cycles. Although, the eevee solution seems more useful.

Consider this setup:

Cycles replaces the internal link with a convert node that converts the Color input to the Value output. This happens to work the same as RGB to BW apparently.
However, eevee does this:

So it does not convert the color to an intermediate BW value.

I still consider this a bug, because Cycles and eevee should work the same in this regard.
@brecht, @fclem should Cycles or eevee be changed here?

Ah, actually, I'm not sure if this is a bug in eevee or Cycles. Although, the eevee solution seems more useful. Consider this setup: ![image.png](https://archive.blender.org/developer/F7757998/image.png) Cycles replaces the internal link with a convert node that converts the Color input to the Value output. This happens to work the same as RGB to BW apparently. However, eevee does this: ![image.png](https://archive.blender.org/developer/F7758008/image.png) So it does not convert the color to an intermediate BW value. I still consider this a bug, because Cycles and eevee should work the same in this regard. @brecht, @fclem should Cycles or eevee be changed here?

Brecht Van Lommel commented

2019-09-19 14:30:10 +02:00

Closed as duplicate of #54777

Brecht Van Lommel closed this issue

2019-09-19 14:30:10 +02:00

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Mute RGB to BW converter node doesn't work in Cycles rendered #70064