Data sharing between geometry nodes and shader through attributes not working

Question

When I share data between shader and geometry nodes through attributes (more concretely, I was sharing color of the object), it works perfectly, as seen on picture:

However, when I don't use the original geometry (eg. use Cube node), it stops working:

Why does it not work and how can I fix it? Thanks!

Does this answer your question? https://blender.stackexchange.com/a/268739/145249 — quellenform, Sep 30 '22 at 16:36
You could try this too: https://blender.stackexchange.com/a/270303/145249 — quellenform, Sep 30 '22 at 16:38
That color attibute is for the original cube only, if you want add color to an instance, use the SET MATERIAL node in front of the instance and before the Output — Emir, Sep 30 '22 at 16:38
Combination of @quellenform and Emir comments worked perfectly, thanks so much! — FireFragment, Sep 30 '22 at 17:11

score 1 · Accepted Answer · answered Oct 02 '22 at 10:55

Just to be able to mark the question as solved, here is a short answer to this from the comments:

To transfer a color attribute from Geometry Nodes to the Shader, a corresponding attribute must be created.

This can either be passed directly to the Group Output (as seen in your screenshot), or an attribute can be explicitly created with the node Store Named Attribute.

Here you have two options.

Either you create the attribute and read it in the shader with the node Attribute:

Or you create a Color Attribute beforehand, store your color there, and read this attribute with the node Color Attribute:

In addition, a material must be assigned to the created geometry with Set Material!

Data sharing between geometry nodes and shader through attributes not working

1 Answers1