"Add simple UVs" unwrap different in Blender 2.79 from master #54410

New Issue

YAFU · 2018-03-23T23:18:51+01:00

YAFU commented

2018-03-23 23:18:51 +01:00

System Information
Kubuntu Linux 64bits

Blender Version
Broken: From buildbot, master aeec19d2e7
Worked: 2.79a

Short description of error
"Add simple UVs" unwrap different in Blender 2.79 from master, at least in default cube. Unwrapped cube results with overlapping faces, which causes problems when painting. I'm not sure if this is due to some intentional code change, or a bug.
Thanks to jensverwiebe for test this in IRC channel.

Exact steps for others to reproduce the error
Add Cube without UVs. Select cube and go to Texture Paint mode. In Tool Shelf panel, in Tools tab press "Add simple UVs" button. Now see the result in UV / Image editor. Compare with 2.79 official releases, where it works well.

**System Information** Kubuntu Linux 64bits **Blender Version** Broken: From buildbot, master aeec19d2e7 Worked: 2.79a **Short description of error** "Add simple UVs" unwrap different in Blender 2.79 from master, at least in default cube. Unwrapped cube results with overlapping faces, which causes problems when painting. I'm not sure if this is due to some intentional code change, or a bug. Thanks to jensverwiebe for test this in IRC channel. **Exact steps for others to reproduce the error** Add Cube without UVs. Select cube and go to Texture Paint mode. In Tool Shelf panel, in Tools tab press "Add simple UVs" button. Now see the result in UV / Image editor. Compare with 2.79 official releases, where it works well.

YAFU commented

2018-03-23 23:18:52 +01:00

Added subscriber: @YAFU

Ray molenkamp commented

2018-03-24 00:13:55 +01:00

Added subscriber: @LazyDodo

Ray molenkamp commented

2018-03-24 00:13:55 +01:00

I'm pretty sure it's this commit. 759b50b20b

I'm pretty sure it's this commit. 759b50b20b

Campbell Barton was assigned by Ray molenkamp

2018-03-24 00:40:46 +01:00

Philipp Oeser commented

2018-04-18 15:38:39 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2018-04-18 15:38:39 +02:00

Confirming it's caused by above mentioned commit. @ideasman42: feel free to assign to me and I'll try my luck :)

Campbell Barton commented

2019-10-01 21:02:35 +02:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2019-10-01 21:02:35 +02:00

Campbell Barton commented

2019-10-01 21:02:35 +02:00

This was fixed in ba94aaedba

This was fixed in ba94aaedba

ronan ducluzeau commented

2020-12-10 22:12:51 +01:00

Added subscriber: @zeauro

ronan ducluzeau commented

2020-12-10 22:12:51 +01:00

It looks like problem was not properly fixed in no release since 2.79.

The goal of "Add Simple UVs" button was to generate UVs to paint meshes created by Dyntopo, at a time, when it was deleting UVmap.

Now, problem is unnoticed. Because UVs generation is automatic, And Dyntopo tries to preserve an existing UV map.
So, "Add Simple UVs" button is almost never displayed. But problem is still present.

Currently, "Add Simple UVs" unwraps any mesh with a failed Projection. The result is UVfaces that are overlapping.

Add a Sphere or a Torus.
Disable Generated UVs in redo panel.
Go to Texture Paint Workspace.
Press Add Simple UVs button.
Go to UV Editing Workspace.
Menu UV > Seams from UV Islands.

Some seams are missing to obtain a correct Cube Projection, made of 6 Islands. Only 4 have been created.
As a result, 2 of them have overlapping UV Faces.

It looks like problem was not properly fixed in no release since 2.79. The goal of "Add Simple UVs" button was to generate UVs to paint meshes created by Dyntopo, at a time, when it was deleting UVmap. Now, problem is unnoticed. Because UVs generation is automatic, And Dyntopo tries to preserve an existing UV map. So, "Add Simple UVs" button is almost never displayed. But problem is still present. Currently, "Add Simple UVs" unwraps any mesh with a failed Projection. The result is UVfaces that are overlapping. Add a Sphere or a Torus. Disable Generated UVs in redo panel. Go to Texture Paint Workspace. Press Add Simple UVs button. Go to UV Editing Workspace. Menu UV > Seams from UV Islands. Some seams are missing to obtain a correct Cube Projection, made of 6 Islands. Only 4 have been created. As a result, 2 of them have overlapping UV Faces.

ronan ducluzeau commented

2020-12-11 16:41:43 +01:00

Here is a .blend file showing the problem with current UVs from Add Simple UVs.

In attached file, just paint a stroke. Then, rotate 3D view to see the other side of mesh.
Add_Simple_UVs_Issue.blend

Here is a .blend file showing the problem with current UVs from Add Simple UVs. In attached file, just paint a stroke. Then, rotate 3D view to see the other side of mesh. [Add_Simple_UVs_Issue.blend](https://archive.blender.org/developer/F9502880/Add_Simple_UVs_Issue.blend)

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"Add simple UVs" unwrap different in Blender 2.79 from master #54410