Copy material to selected doesn't copy whether the material slot is object or data #119582

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opened 2024-03-17 01:12:26 +01:00 by Rui Liu · 6 comments

Rui Liu commented

2024-03-17 01:12:26 +01:00

System Information
Operating system: Windows 11
Graphics card: RTX 4090 Laptop

Blender Version
Broken: 4.0.2

Short description of error
As title.

Exact steps for others to reproduce the error

Create the first object.
Duplicate and link the mesh to creat the second object.
Create a material slot on the first object.
Set the material slot to be object level.
Select two object with the first object active.
Copy the material to selected (under the materials properties tab).
The second object has a material slot created at data/mesh level.

I didn't test the ctrl-L link functionality, possibly have same issue. There might also be some buggy behaviours when you delete a material slot when slot is on object level. The slots on the second object shouldn't be deleted.

**System Information** Operating system: Windows 11 Graphics card: RTX 4090 Laptop **Blender Version** Broken: 4.0.2 **Short description of error** As title. **Exact steps for others to reproduce the error** 1. Create the first object. 2. Duplicate and link the mesh to creat the second object. 3. Create a material slot on the first object. 4. Set the material slot to be object level. 5. Select two object with the first object active. 6. Copy the material to selected (under the materials properties tab). 7. The second object has a material slot created at data/mesh level. I didn't test the ctrl-L link functionality, possibly have same issue. There might also be some buggy behaviours when you delete a material slot when slot is on object level. The slots on the second object shouldn't be deleted.

Rui Liu added the

labels 2024-03-17 01:12:27 +01:00

Iliya Katushenock added the

labels 2024-03-17 07:00:08 +01:00

Iliya Katushenock commented

2024-03-17 07:01:59 +01:00

Member

Thanks for report, i can not confirm that, material always copied to slot on object data for me.

Thanks for report, i can not confirm that, material always copied to slot on object data for me.

Richard Antalik commented

2024-03-17 20:50:25 +01:00

Member

I can reproduce, but not sure whether this would be a bug or not. Would have to check the code.

I can reproduce, but not sure whether this would be a bug or not. Would have to check the code.

Richard Antalik commented

2024-03-25 21:18:09 +01:00

Member

I have checked the code and there are basically 3 scenarios, of which 1 I don't quite understand, and I am second guessing if I understood this report correctly - In second step, what exactly do you mean by duplicate and link?

But for case when you have 2 objects with no relation to each other, it does this:
If there is material slot, it copies material to this slot, and does not change if this is object or mesh data.
If there is no slot, it makes new slot and data is linked to what is set in preferences > Editing > Objects.

I have checked the code and there are basically 3 scenarios, of which 1 I don't quite understand, and I am second guessing if I understood this report correctly - In second step, what exactly do you mean by duplicate and link? But for case when you have 2 objects with no relation to each other, it does this: If there is material slot, it copies material to this slot, and does not change if this is object or mesh data. If there is no slot, it makes new slot and data is linked to what is set in preferences > Editing > Objects.

Richard Antalik added

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labels 2024-03-25 21:18:20 +01:00

Rui Liu commented

2024-03-26 12:45:23 +01:00

Author

By "duplicate and link" I mean Alt-D.

By "duplicate and link" I mean Alt-D.

Richard Antalik commented

2024-03-26 13:24:17 +01:00

Member

Ok I see what you mean now, so you only add material slot and not assign any material, right? But then slot will be created on other object in step 3 already. And not change after step 4.

From what I can see, slots are property of mesh only. So if objects share mesh, if you remove a slot, this means both objects will loose it.
I guess this is due to historic reasons, but I would also say, that manual should reflect this.

Ok I see what you mean now, so you only add material slot and not assign any material, right? But then slot will be created on other object in step 3 already. And not change after step 4. From what I can see, slots are property of mesh only. So if objects share mesh, if you remove a slot, this means both objects will loose it. I guess this is due to historic reasons, but I would also say, that manual should reflect this.

Richard Antalik commented

2024-03-27 19:27:34 +01:00

Member

Will confirm, at least because this could be mentioned in manual and as mentioned, slot removal in these cases may lead to loss of work if unnoticed.

Will confirm, at least because this could be mentioned in manual and as mentioned, slot removal in these cases may lead to loss of work if unnoticed.

Richard Antalik added

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labels 2024-03-27 19:28:12 +01:00

Philipp Oeser added the

label 2024-04-02 10:59:20 +02:00

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