Unlinking material and copying new one leaves mesh with no material applied unless mat. list cleanup #72669

New Issue

Olivier Lau · 2019-12-24T11:21:16+01:00

Olivier Lau commented

2019-12-24 11:21:16 +01:00

Operating system: Windows 10
Graphics card: nvidia RTX 2080
Broken: 2.81a

Unlinking a material from a mesh then copying another material over it places it in second position in material list hence material is not being applied. This is especially annoying as copying objects duplicates the material which needs to be removed and replaced.

Exact steps for others to reproduce the error

open the attached sample.blend, use the Rendered view mode to see textures
duplicate the object "Cube reference" using CTRL+C and CTRL+V
select the cube copy object, notice the material has been duplicated, unlink this material
drag&drop material GreenTex from "Cube reference" onto the cube copy object

Expected result:
The cube copy object would show textured.

Actual result:
The cube copy doesn't show the texture.

Discussion:
The reason why the cube copy doesn't show up with the copied material is because the unlink left a blank material entry in the object's material list, the subsequent material copy added the material in second position, which does not show up. Removing the first material position (the empty one) brings the copied material in first position and it shows up properly.

This is not a defect per se but an implementation making things clumsy. There are basically two user interaction issues there:

the fact that duplicating an object also duplicates its material is not wanted in many situations, there should be in the first place a modifier key or something enabling to duplicate an object without creating a new material.
unlinking the material leaving an empty material slot in the object's material list, this is probably worth reconsidering.sample.zip

Operating system: Windows 10 Graphics card: nvidia RTX 2080 Broken: 2.81a Unlinking a material from a mesh then copying another material over it places it in second position in material list hence material is not being applied. This is especially annoying as copying objects duplicates the material which needs to be removed and replaced. **Exact steps for others to reproduce the error** 1. open the attached sample.blend, use the Rendered view mode to see textures 2. duplicate the object "Cube reference" using CTRL+C and CTRL+V 3. select the cube copy object, notice the material has been duplicated, unlink this material 4. drag&drop material GreenTex from "Cube reference" onto the cube copy object Expected result: The cube copy object would show textured. Actual result: The cube copy doesn't show the texture. Discussion: The reason why the cube copy doesn't show up with the copied material is because the unlink left a blank material entry in the object's material list, the subsequent material copy added the material in second position, which does not show up. Removing the first material position (the empty one) brings the copied material in first position and it shows up properly. This is not a defect per se but an implementation making things clumsy. There are basically two user interaction issues there: - the fact that duplicating an object also duplicates its material is not wanted in many situations, there should be in the first place a modifier key or something enabling to duplicate an object without creating a new material. - unlinking the material leaving an empty material slot in the object's material list, this is probably worth reconsidering.[sample.zip](https://archive.blender.org/developer/F8242152/sample.zip)

Olivier Lau commented

2019-12-24 11:21:16 +01:00

Added subscriber: @ilio

Germano Cavalcante commented

2019-12-27 16:24:12 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2019-12-27 16:24:12 +01:00

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

Germano Cavalcante closed this issue

2019-12-27 16:24:12 +01:00

Germano Cavalcante self-assigned this 2019-12-27 16:24:12 +01:00

Germano Cavalcante commented

2019-12-27 16:24:12 +01:00

Although not convenient, this is not a bug.

I suppose you try to do material operations using the outliner, but the outliner is not supposed to be used for this. It is only used to organize relationships between IDs.
The materials and their slots are worked in the properties editor .

For suggestions on how to improve the UI, please use other channels:
https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

Although not convenient, this is not a bug. I suppose you try to do material operations using the outliner, but the outliner is not supposed to be used for this. It is only used to organize relationships between IDs. The materials and their slots are worked in the [properties editor ](https://docs.blender.org/manual/en/latest/editors/properties_editor.html#object-shading). For suggestions on how to improve the UI, please use other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

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Unlinking material and copying new one leaves mesh with no material applied unless mat. list cleanup #72669