Overriding materials is not working as expected in 2.91 beta #82033

New Issue

Juan Gea · 2020-10-24T18:25:28+02:00

Juan Gea commented

2020-10-24 18:25:28 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

Blender Version
Broken: version: 2.91.0 Beta, branch: master, commit date: 2020-10-23 17:33, hash: 70cc0d7121

Tested also with today's buildbot 2.92 (24/10/2020) and it has the same problem.

Worked: never

Short description of error
@mont29 wrote a description on how materials could be overriden for the time being, but this is not working as expected, here is the description:

@mont29
With current master, if you override the object and assign material to the object and select a new material for an existing slot, it should work.
Same if you also override the obdata and assign material to obdata and select a new material for an existing slot there.

Adding new slots won’t work though, and material properties themselves are mostly non-overridable currently.

I've prepared some simple files that show the problem:

Monkey_Base.blend
Monkey_Collection_Mat_Override.blend
Monkey_Object_Mat_Override.blend

Basically in Monkey_Collection_Mat_Override.blend and Monkey_Object_Mat_Override.blend the overrides are already done, the original object is in the Monkey_Base.blend file.

Just follow this steps:

1.- Open one of the "Mat_Override" blends, no matter what of them, or test both.

2.- Select the monkey head, it should be there if you don't have problem with the link paths, I think you should not have any problem, in case you have just relocate the linked .blend to the Monkey_Base.blend

3.- You will see there is also a sphere in the scene, that sphere has another material, in this case is a local one

4.- be sure to create the override in the outliner for the material, with the Add Library Override Hierarchy option, by the way this is not done already because it's not being saved with the file.

5.- Assign the sphere material to the override monkey, you will see that will work so far, you will see the material being override in the scene.

6.- Save the scene with whatever name you want

7.- Close blender or go to a new file

8.- Re-Open the file you just saved

9.- the override was not saved and the monkey is still red with the original material

Here is also a video to show the problem in case you prefer to watch it:

Overrides_Not_Working_As_Expected.mp4

I hope this can be fixed for 2.91 release, since it was something expected to work by @mont29 and he considered it a possible bug of the current status.

Thanks!

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71 **Blender Version** Broken: version: 2.91.0 Beta, branch: master, commit date: 2020-10-23 17:33, hash: `70cc0d7121` Tested also with today's buildbot 2.92 (24/10/2020) and it has the same problem. Worked: never **Short description of error** @mont29 wrote a description on how materials could be overriden for the time being, but this is not working as expected, here is the description: > @mont29 >With current master, if you override the object and assign material to the object and select a new material for an existing slot, it should work. >Same if you also override the obdata and assign material to obdata and select a new material for an existing slot there. >Adding new slots won’t work though, and material properties themselves are mostly non-overridable currently. I've prepared some simple files that show the problem: [Monkey_Base.blend](https://archive.blender.org/developer/F9071611/Monkey_Base.blend) [Monkey_Collection_Mat_Override.blend](https://archive.blender.org/developer/F9071616/Monkey_Collection_Mat_Override.blend) [Monkey_Object_Mat_Override.blend](https://archive.blender.org/developer/F9071617/Monkey_Object_Mat_Override.blend) Basically in *Monkey_Collection_Mat_Override.blend* and *Monkey_Object_Mat_Override.blend* the overrides are already done, the original object is in the *Monkey_Base.blend* file. Just follow this steps: 1.- Open one of the "Mat_Override" blends, no matter what of them, or test both. 2.- Select the monkey head, it should be there if you don't have problem with the link paths, I think you should not have any problem, in case you have just relocate the linked .blend to the *Monkey_Base.blend* 3.- You will see there is also a sphere in the scene, that sphere has another material, in this case is a local one 4.- be sure to create the override in the outliner for the material, with the *Add Library Override Hierarchy* option, by the way this is not done already because it's not being saved with the file. ![image.png](https://archive.blender.org/developer/F9071669/image.png) 5.- Assign the sphere material to the override monkey, you will see that will work so far, you will see the material being override in the scene. 6.- Save the scene with whatever name you want 7.- Close blender or go to a new file 8.- Re-Open the file you just saved 9.- the override was not saved and the monkey is still red with the original material Here is also a video to show the problem in case you prefer to watch it: [Overrides_Not_Working_As_Expected.mp4](https://archive.blender.org/developer/F9071687/Overrides_Not_Working_As_Expected.mp4) I hope this can be fixed for 2.91 release, since it was something expected to work by @mont29 and he considered it a possible bug of the current status. Thanks!

Juan Gea commented

2020-10-24 18:25:28 +02:00

Added subscribers: @mont29, @juang3d

Bastien Montagne commented

2020-10-26 13:59:35 +01:00

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

Bastien Montagne closed this issue

2020-10-26 13:59:35 +01:00

Bastien Montagne self-assigned this 2020-10-26 13:59:35 +01:00

Bastien Montagne commented

2020-10-26 13:59:35 +01:00

It works if in the original library file the obdata does not have an assigned material (i.e. if the material is linked to the object only in the lib file).

Not much to do beyond that, fixing this nightmare is on the todo list at some point.

It works if in the original library file the obdata does not have an assigned material (i.e. if the material is linked to the object only in the lib file). Not much to do beyond that, fixing this nightmare is on the todo list at some point.

Juan Gea commented

2020-10-26 14:35:36 +01:00

Ok, but I don’t understand what you mean, can you explain a bit how to make it work?

Thanks :)

Ok, but I don’t understand what you mean, can you explain a bit how to make it work? Thanks :)

Bastien Montagne commented

2020-10-26 15:24:27 +01:00

Your .blend library file should not have material assigned to mesh, only to object.

Nick Masterton commented

2021-12-20 18:05:40 +01:00

Added subscriber: @VupliDerts-2

Nick Masterton commented

2021-12-20 18:16:14 +01:00

As somebody mentioned in the comments of this video: https://www.youtube.com/watch?v=8vmVGUnnOIs

It is possible to persistently override materials if the original material is linked to the object, however it does appear not to work if the original material is linked to the data.
Not sure if this is a feature or a bug or just something I am misunderstanding about the way my object is linked

I am using Blender 3.0.

Hope that helps somebody, cheers!

As somebody mentioned in the comments of this video: https://www.youtube.com/watch?v=8vmVGUnnOIs It is possible to persistently override materials ***if*** the original material is linked to the object, however it does appear not to work if the original material is linked to the data. Not sure if this is a feature or a bug or just something I am misunderstanding about the way my object is linked I am using Blender 3.0. Hope that helps somebody, cheers!

Emi Martinez commented

2022-04-15 06:22:58 +02:00

Added subscriber: @Emi_Martinez

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Overriding materials is not working as expected in 2.91 beta #82033