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Joining objects deletes UV map #64245

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opened 2019-05-07 12:57:10 +02:00 by Robert S · 10 comments
Robert S commented 2019-05-07 12:57:10 +02:00
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System Information
Operating system: Windows 10
Graphics card: 1080

Blender Version
Broken: 2.8 ee0d8426ab
Worked: (optional)

Short description of error
Joining two objects together with ctrl-j deletes the UV map of the joining object.

Exact steps for others to reproduce the error

  • Open the attached .blend file
  • Select two objects

Press ctrl-j

Result:

  • The first selected objects UV map is deleted

Expected result:

  • Both object's original UV maps should be retained even after they are joined

join-uv-deleted.zip

**System Information** Operating system: Windows 10 Graphics card: 1080 **Blender Version** Broken: 2.8 ee0d8426ab6d Worked: (optional) **Short description of error** Joining two objects together with ctrl-j deletes the UV map of the joining object. **Exact steps for others to reproduce the error** - Open the attached .blend file - Select two objects # Press ctrl-j Result: * The first selected objects UV map is deleted Expected result: * Both object's original UV maps should be retained even after they are joined [join-uv-deleted.zip](https://archive.blender.org/developer/F7012311/join-uv-deleted.zip)
Robert S commented 2019-05-07 12:57:10 +02:00
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Added subscriber: @RobertS

Added subscriber: @RobertS
Philipp Oeser commented 2019-05-07 13:36:17 +02:00
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Added subscriber: @lichtwerk

Added subscriber: @lichtwerk
Philipp Oeser commented 2019-05-07 13:36:17 +02:00
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Cannot reproduce here.

I can see both UVMaps on the joined object, and both maps have the 'original' UVs...
#64245.png

Does this happen in todays build as well?

Cannot reproduce here. I can see both UVMaps on the joined object, and both maps have the 'original' UVs... ![#64245.png](https://archive.blender.org/developer/F7012386/T64245.png) Does this happen in todays build as well?
Robert S commented 2019-05-08 09:01:35 +02:00
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Here is a video using today's build and the file attached above:

https://youtu.be/3urat2vW3Uk

At 30 seconds into the video I press ctrl-j which deletes the UV of the first object I previously selected.

Here is a video using today's build and the file attached above: https://youtu.be/3urat2vW3Uk At 30 seconds into the video I press ctrl-j which deletes the UV of the first object I previously selected.
Robert S commented 2019-05-08 09:05:53 +02:00
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Ok, important discovery:

  • The UV map isn't deleted. It's given a name and placed in the object tab under UV Maps and then hidden!
  • This is super confusing to a new user, who isn't aware of this panel!
  • Further, why is itimpossible to view both UV Maps at the same time? I can only view one of them at once.
  • If I want to merge them, there's no right-click menu with that option in the UV Maps list.
  • How does this get exported? Do other apps care about the UV Map names and visibility, to the extent Blender does (example, Unity/Unreal)?

Maybe this isn't a modeling bug, bug rather a Ux flaw and that needs a design change.

Ok, important discovery: - The UV map isn't deleted. It's given a name and placed in the object tab under UV Maps and then **hidden**! - This is super confusing to a new user, who isn't aware of this panel! - Further, why is it*impossible to view both UV Maps at the same time*? I can only view one of them at once. - If I want to merge them, there's no right-click menu with that option in the UV Maps list. - How does this get exported? Do other apps care about the UV Map names and visibility, to the extent Blender does (example, Unity/Unreal)? Maybe this isn't a modeling bug, bug rather a Ux flaw and that needs a design change.
Brecht Van Lommel commented 2019-05-13 22:42:59 +02:00
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Added subscriber: @brecht

Added subscriber: @brecht
Brecht Van Lommel commented 2019-05-13 22:42:59 +02:00
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Changed status from 'Open' to: 'Archived'

Changed status from 'Open' to: 'Archived'
Brecht Van Lommel self-assigned this 2019-05-13 22:42:59 +02:00
Brecht Van Lommel commented 2019-05-13 22:42:59 +02:00
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UV maps are only merged if they have the same name. To solve the issue you need to give both maps the same name.

While it may be possible to improve the user interface, this is not a bug.

UV maps are only merged if they have the same name. To solve the issue you need to give both maps the same name. While it may be possible to improve the user interface, this is not a bug.
Sarosh-Chinoy commented 2024-06-05 10:18:54 +02:00
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Can we please look into this again? It's a big problem if you have a project with hundreds of little parts. Why not give a dialogue box that will auto-rename all the UV Maps to one if it detects a conflict in UV Map naming while joining meshes?

Can we please look into this again? It's a big problem if you have a project with hundreds of little parts. Why not give a dialogue box that will auto-rename all the UV Maps to one if it detects a conflict in UV Map naming while joining meshes?
Philipp Oeser commented 2024-06-05 10:44:21 +02:00
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We also have #111608 open (it is a related issue).

One possible solution there was to "merge the UV layers based upon index (so merge all first uv layers of all sources into one on the destination, merge all second uv layers of all sources into a second uv layer on destination, ...) -- this could be an option on the operator"

#111608 (comment)

We also have #111608 open (it is a related issue). One possible solution there was to "merge the UV layers based upon index (so merge all first uv layers of all sources into one on the destination, merge all second uv layers of all sources into a second uv layer on destination, ...) -- this could be an option on the operator" https://projects.blender.org/blender/blender/issues/111608#issuecomment-1007577
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Reference: blender/blender#64245
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