Geometry Nodes, modifiers after GN removes material #85893

New Issue

Gurra · 2021-02-22T18:17:07+01:00

Gurra commented

2021-02-22 18:17:07 +01:00

System Information
Operating system: Windows 10
Graphics card: RTX 3060ti

Blender Version
Broken: 2.93.0 Alpha 37e6a1995a

Short description of error
Exact steps for others to reproduce the error
When using geometry nodes to instance other objects on a surface and then add an array modifier for example after GN the instanced geometry gets the same material as the base surface. In 2.92 the array wont array the instances, but at least the material stays the same.
Also when making this example scene some of the instances got some weird shading when enabling that array modifier. Not really part of the bug report, but still something to look into maybe? :)

geometyrynodematerialbug.blend

**System Information** Operating system: Windows 10 Graphics card: RTX 3060ti **Blender Version** Broken: 2.93.0 Alpha 37e6a1995ac7 **Short description of error** **Exact steps for others to reproduce the error** When using geometry nodes to instance other objects on a surface and then add an array modifier for example after GN the instanced geometry gets the same material as the base surface. In 2.92 the array wont array the instances, but at least the material stays the same. Also when making this example scene some of the instances got some weird shading when enabling that array modifier. Not really part of the bug report, but still something to look into maybe? :) ![geometyrynodematerialbug2.jpg](https://archive.blender.org/developer/F9827982/geometyrynodematerialbug2.jpg) ![geometyrynodematerialbug1.jpg](https://archive.blender.org/developer/F9827967/geometyrynodematerialbug1.jpg) [geometyrynodematerialbug.blend](https://archive.blender.org/developer/F9827969/geometyrynodematerialbug.blend)

Gurra commented

2021-02-22 18:17:07 +01:00

Added subscriber: @Gurra

Hans Goudey commented

2021-02-24 14:59:34 +01:00

Added subscriber: @HooglyBoogly

Hans Goudey commented

2021-02-24 14:59:34 +01:00

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

Hans Goudey commented

2021-02-24 14:59:34 +01:00

Thanks for the report. Looking into the file, for now this is expected. In order for the array modifier to work, the instances created by the point instance node must be converted into one mesh, and the code that combines all of the instances just doesn't combine the materials yet.

A workaround for now is to add all the materials on the final object and use the material_index attribute to control which to use.

It's possible, but we haven't focused on this use case yet. I will leave this as a known issue so we have a reminder.

Thanks for the report. Looking into the file, for now this is expected. In order for the array modifier to work, the instances created by the point instance node must be converted into one mesh, and the code that combines all of the instances just doesn't combine the materials yet. A workaround for now is to add all the materials on the final object and use the `material_index` attribute to control which to use. It's possible, but we haven't focused on this use case yet. I will leave this as a known issue so we have a reminder.

Gurra commented

2021-02-24 17:23:05 +01:00

Yupp, good to know, thanks!
And might be good for you to know for whenever you might fix this; tried out that material_index thing and it seems to work, except that when enabling a modifier after the geonode will remove all UV-maps. So in practice it's not really viable work around either. So I'll just have to wait :) Thanks again!

Yupp, good to know, thanks! And might be good for you to know for whenever you might fix this; tried out that material_index thing and it seems to work, except that when enabling a modifier after the geonode will remove all UV-maps. So in practice it's not really viable work around either. So I'll just have to wait :) Thanks again!

Sergey commented

2021-04-22 13:02:00 +02:00

Added subscriber: @randum

Hans Goudey commented

2021-07-06 05:41:41 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Hans Goudey closed this issue

2021-07-06 05:41:41 +02:00

Hans Goudey self-assigned this 2021-07-06 05:41:41 +02:00

Hans Goudey commented

2021-07-06 05:41:41 +02:00

This has basically been resolved for 3.0 with the material assign node and the other material nodes.

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Geometry Nodes, modifiers after GN removes material #85893