Material node 'Color Attribute' does not find attribute if geometry nodes generate geometry other than Mesh #117536
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Reference: blender/blender#117536
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System Information
Operating system: Windows-10-10.0.22631-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 4090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 546.33
Blender Version
Broken: versions: 3.6.x and 4.0.x
Worked: none
Short description of error
When we add color attributes to the output of Geometry Nodes, we can access these attributes in the Shader Editor.
However, if the geometry generated for the object is something other than
Mesh, theColor Attributenode does not find these attributes and turns red (even though they exist).See the attached screencast video that shows the issue:
Exact steps for others to reproduce the error
Not that the
Color Attributenode in the Shader Editor has a red input indicating that it is invalid.Thank you for the report. However, according to the manual:
Since the generated geometry is of type "Point Cloud" and not "Mesh", the behavior you have described seems to be expected.Not a bug AFAICS, closing.Feel free to comment if there is misunderstanding.EDIT: no warning is displayed.
ok, so how to use it if I do want to use the Points node and get it as Mesh?
can you guide me on how to handle this?
Analyzing better, the reason for this behavior is not exactly because the geometry is Point Cloud type. It's more because the UI does no find the specified attributes in the Mesh.
This already goes into issues that are outside my expertise.
Maybe this is something that hasn't been implemented for generated Point Clouds?
Cc. @JacquesLucke, @HooglyBoogly
This is a limitation of the various attribute selectors in many places. Currently the one in the color attribute node just looks in the active object's evaluated mesh. This might still work, but the button will show with a red alert. It's probably worth changing this attribute selector to be more of a "suggestion" like attribute name fields in geometry nodes where you can still type in any string you want. It's hard to get a complete view on all the attributes for the UI.
A workaround for now would be using the "Attribute" node instead of the "Color Attribute" node.
Output Attribute is not recognize while Geometry Nodes "Points" is usedto Material node 'Color Attribute' does not find attribute if geometry nodes generate geometry other than MeshIn that case, I think we can confirm the issue.
I'm not sure actually, AFAIK this is expected behavior. Not that it's good behavior, but "fixes" would be things like "Point Cloud: Add color attributes list" or "Nodes: Improve attribute selection to consider all evaluated geometry". Not exactly bug fixes.
Thank you.
Any chance it will be handled in the future?
It looks like it is an issue that needs to be addressed.