Attribute node does not work in Cycles (renders black) when some reserved standard attribute names (such as "color") are used #87494

New Issue

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: Radeon (TM) RX 480 Graphics ATI Technologies Inc. 4.5.14760 Core Profile Context 20.45.37.01 27.20.14537.1001

Blender Version
Broken: 2.79 - 2.93.0 Alpha, branch: master, commit date: 2021-04-14 02:19, hash: 6776b74d0a
Worked: Never?

Short description of error
In Cycles, the Attribute node always returns black when the attribute name is "color".
The color attribute can be a common Vertex Color or created through Geometry Nodes.

Exact steps for others to reproduce the error

Open attached file
Display render preview (note that the object is black)
Change the name on the node attribute and Vertex Color to "color2"
Now the node attribute works
vcol_cycles_name_bug.blend

Seems like these attribute names could be affected:
https://developer.blender.org/diffusion/B/browse/master/intern/cycles/scene/attribute.cpp$323

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: Radeon (TM) RX 480 Graphics ATI Technologies Inc. 4.5.14760 Core Profile Context 20.45.37.01 27.20.14537.1001 **Blender Version** Broken: 2.79 - 2.93.0 Alpha, branch: master, commit date: 2021-04-14 02:19, hash: `6776b74d0a` Worked: Never? **Short description of error** In Cycles, the Attribute node always returns black when the attribute name is "color". The color attribute can be a common Vertex Color or created through Geometry Nodes. **Exact steps for others to reproduce the error** - Open attached file - Display render preview (note that the object is black) - Change the name on the node attribute and Vertex Color to "color2" Now the node attribute works [vcol_cycles_name_bug.blend](https://archive.blender.org/developer/F9933464/vcol_cycles_name_bug.blend) Seems like these attribute names could be affected: https://developer.blender.org/diffusion/B/browse/master/intern/cycles/scene/attribute.cpp$323

Added subscriber: @mano-wii

#101880 was marked as duplicate of this issue

#101037 was marked as duplicate of this issue

#100193 was marked as duplicate of this issue

#99582 was marked as duplicate of this issue

#93531 was marked as duplicate of this issue

#95168 was marked as duplicate of this issue

#94988 was marked as duplicate of this issue

#92116 was marked as duplicate of this issue

#87373 was marked as duplicate of this issue

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

Apparently this is related to built-in attributes as seen in https://blender.stackexchange.com/questions/14262/what-can-you-call-from-the-attribute-node#14267

Added subscribers: @slowburn, @CharlieJolly

I just wanted to clarify that this is not limited to vertex colors. Thanks to a recently added feature, custom attributes created in geometry nodes can be used directly in Cycles without the need for vertex colors: https://developer.blender.org/rB3a6d6299d
Maybe the fix will apply to GN as well, but I think it would be good if you could modify the name or description of this task to indicate that it also affects geometry nodes, since you closed my task.

I just wanted to clarify that this is not limited to vertex colors. Thanks to a recently added feature, custom attributes created in geometry nodes can be used directly in Cycles without the need for vertex colors: https://developer.blender.org/rB3a6d6299d Maybe the fix will apply to GN as well, but I think it would be good if you could modify the name or description of this task to indicate that it also affects geometry nodes, since you closed my task.

Added subscribers: @barakooda, @EAW

Added subscribers: @1029910278, @HooglyBoogly

Added subscribers: @MysteryPancake, @kevindietrich, @lichtwerk

Added subscribers: @OrestisKonstantinidis, @null

Added subscriber: @shadow_creeper

Removed subscriber: @MysteryPancake

Added subscriber: @OmarEmaraDev

Added subscriber: @Matthias-Schafer

Added subscriber: @SteffenD

Added subscriber: @dupoxy

still true it seems ... I was about to fill a new bug report using this file: reT87494.blend

still true it seems ... I was about to fill a new bug report using this file: [reT87494.blend](https://archive.blender.org/developer/F14197973/reT87494.blend) ![Capture d’écran 2023-01-25 à 19.10.50.png](https://archive.blender.org/developer/F14197976/Capture_d_e_cran_2023-01-25_a__19.10.50.png)

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Attribute node does not work in Cycles (renders black) when some reserved standard attribute names (such as "color") are used #87494