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UVs not unwrapping to 0-1 space in blender 2.8 when unselected in the Image Editor
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Description

i see 2 error in uv.
1 if i select 1 face, this face big size in uv editor.
2 if i select all face and pressed unwrap uv , this no created uv.

Event Timeline

Philipp Oeser (lichtwerk) triaged this task as Confirmed, Medium priority.Nov 6 2018, 11:30 AM
Philipp Oeser (lichtwerk) edited projects, added BF Blender: 2.8; removed BF Blender.

To me it seems blender2.8 behaves a little differently from 2.79 in regards to selection:

All is fine if you have the Keep UV and edit mode mesh selection in syncoption ON.
If you have this ON you should have a UVs unwrapped and in 0-1 UV space.
(this was kind of reported before in T57060 -- and eventually closed but issue with selection persist actually, see the following)

Now to the difference (see attached file):


In 2.8, it makes a difference which UVs you have selected in the UVEditor, in 2.79 this was not the case.
If you have a single UV selected (in UV editor), but select all faces in the 3D view and call unwrap from the 3D view then

  • 2.79 will unwrap all and put them in 0-1 space
  • 2.8 will unwrap all (but seperated in two islands), but only pack one part in 0-1 space the other is somewhere out of 0-1 space

I think this should not be intentional?
@Campbell Barton (campbellbarton) : mind having a look?

To me it seems blender2.8 behaves a little differently from 2.79 in regards to selection:

All is fine if you have the Keep UV and edit mode mesh selection in syncoption ON.
If you have this ON you should have a UVs unwrapped and in 0-1 UV space.
(this was kind of reported before in T57060 -- and eventually closed but issue with selection persist actually, see the following)

Now to the difference (see attached file):


In 2.8, it makes a difference which UVs you have selected in the UVEditor, in 2.79 this was not the case.
If you have a single UV selected (in UV editor), but select all faces in the 3D view and call unwrap from the 3D view then

  • 2.79 will unwrap all and put them in 0-1 space
  • 2.8 will unwrap all (but seperated in two islands), but only pack one part in 0-1 space the other is somewhere out of 0-1 space

    I think this should not be intentional? @Campbell Barton (campbellbarton) : mind having a look?

Thank you very much for the explanation. This button is much better.
It is not enough now to copy, paste to work with uv.

Philipp Oeser (lichtwerk) renamed this task from Error in UV editor in blender 2.8 to UVs not unwrapping to 0-1 space in blender 2.8 when unselected in the Image Editor.Nov 25 2018, 6:47 PM

This can be easily observed with the default cube.

Sync-off, simple 'U' unwrap with all edges as seams:

Sync-on, simple 'U' unwrap with all edges as seams: