Cannot set the Color attribute to display an object through Geometry Nodes #109443
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Reference: blender/blender#109443
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System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 535.98
Blender Version
Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash:
e1ccd9d4a1d3Worked: version: 3.4.1
behavior changed in
6514bb05eaShort description of error
Using the "Store Named Attribute" node setting the Attribute "Col" in geometry nodes, no longer sets the Vertexcolor of an object procedurally. When the Curve is converted to mesh and then the created "Col" Vertexcolor attribute is clicked, the colors show up.
In 3.4 and below this would override the vertexcolor attribute in "realtime" without converting the curve to mesh.
Exact steps for others to reproduce the error
On a Curve Object, add a geometry node
Attached file with example setup that used to overwrite the vertexcolor in 3.4.1, but no longer does in 3.5.1
I can confirm the problem.
It looks more like a Worbench UI issue since it is not possible to specify which attribute is to be displayed as Color attribute in an object of type Curve.
@HooglyBoogly, since you've already touched on the attribute system a few times, any idea if this switch from displaying black is intentional?
This is a known issue for now. The workbench "Attribute" coloring uses the active color attribute, and due to some internal changes, the store named attribute node doesn't set the active color anymore. TBH it only worked by mistake before, but it is useful so I can see why people used it. In the meantime I'd recommend using material preview and a material that specifically references the attribute, or the viewer node.
Writing of vertexcolor in curve objects via Geometry nodes no longer possible in 3.5.1to Cannot set the Color attribute to display an object through Geometry NodesIt looks more like a design issue for Workbench that needs to be discussed.
I'm confirming it as a Know Issue for now.
Hey thanks for looking into this! I’m mainly using this feature to write edge pointiness data into vertex color for material masks.
Clicked the close issue button -.-
In Solid viewport shading, with the Attribute mode, behavior changed in
6514bb05eaFor meshes, this has already been reported in #103551 (and I would bet that the issue here -- for curves -- also wont really be considered a bug, since for curves, the design of the active attribute cant really be met...)
Leaving up to @HooglyBoogly though to make a final decision here.
Oh, I still had this tab open and did not notice there where comments already
I'd like to share about the strange behavior of this issue.
It seems that the problem arises due to the generated Geometry.
That is, the Color Attribute set with the Store Named Attribute Node for the GroupInput's Geometry displays correctly.
Even when the GroupInput is combined with the JoinGeometryNode, it still displays correctly.
However, the outcome changes based on the input order to the JoinGeometry.
It only displays correctly when the GroupInput is the first input.
I hope sharing this strange behavior can help in resolving the issue.