Volume-type geometries always seem to use the object material while mesh primitives are unpredictable #113712
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Reference: blender/blender#113712
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System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce MX150/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 471.68
Blender Version
Broken: version: 3.6.4, branch: blender-v3.6-release, commit date: 2023-09-25 13:24, hash:
21bfc5e7fe3fWorked: (newest version of Blender that worked as expected)
I also have checked 4.0b, 4.1a and 3.5.1. It works the same over there.
Short description of error
Relinking object materials relinks geometry node material.
This error occurs with points, hair, converting curves to mesh, converting mesh to volume. This works correctly with procedural primitives.
Exact steps for others to reproduce the error
Properties>Material, change the materialLinktoObject- Note that both generated geometries now use the material set to the objectMesh to VolumenodeThe Icosphere has the material that we assigned inside the GN.
Might be duplicate of #112372
I can confirm the problem.
It is similar to these others:
#112372: Set Material Index node does not work on some GN-created geometry
#98834: Broken material assigment after changing mesh-linking to object-linking
#99996: Replace object-linked materials feature
#93455: Set Material Node does not reuse existing empty slot
#105993: Applying geometry nodes modifier create an empty material slot for no reason
#85578: "Join Meshes" changes the material slot assigned to faces of the original mesh
However there is a peculiarity in the provided .blend file.
Volume-type geometry always seems to use the material set for object, while other geometry types can use any material.
I believe that, although probably related to some of the above, this issue has not been specifically reported before.
So I'll confirm (after editing the description a little).
GN: Relinking object materials relinks GN materialto Volume-type geometries always seem to use the object material rather than that set by geometry nodesVolume-type geometries always seem to use the object material rather than that set by geometry nodesto Volume-type geometries always seem to use the object material while mesh primitives are unpredictableThanks for your work. This is my first bug report. And such a quick response. I am delighted. It's so hard to find an undocumented bug. I will consider that I succeeded. So now I have a small personal achievement. You are doing a great job. For me, the blender command is the command that I constantly cite as an example when I talk about bugs in any other software. If it is inappropriate to write such things here, please delete this message and I will draw conclusions. Thanks again!
I fear this is the same issue as in many other similar cases. Geometry nodes does not make guarantees about specific material indices (see
material_indexattribute). It only guarantees that materials attached to some geometry will stay there, but the underlying material index may change fairly arbitrarily. By using the (somewhat legacy) object material overwriting feature, you are making assumptions about specific material indices which leads to seemingly unexpected behavior.It's planned to replace the material overwrite feature with something that works better with procedural effects (#99996).