Weld Command and UV map

[micheus]

Just for share...

You probably will not smooth the object, so if you don't mind to have some extra and tiny faces close to the weld region then you could try to extrude a short amount the face that will be welded. But, use the Weld [RMB] and set the tolerance to a shorter value.
I'm not sure it would work, but you could try.

I tried and it "works". Extrude->Normal by 0 offset and in the Weld->Tolerance it was used 0.000:

[micheus]

Oh lord! I can't stop thinking about this issue.

The "problem" is the UV map coordinates is a vertices attribute, not a material one. So, by welding you are removing one of the two matched vertices from a face (like in my sample) - I think that could be the problem (but I can be wrong)

I see, it makes sense

I have to be wrong, otherwise we couldn't cut the mesh and create islands on AutoUV editor window.
I will take a look on this when I have time.

[gap]

Hi micheus,
thank you for your caring and sorry for the late reply

Just for share...

I tried and it "works". Extrude->Normal by 0 offset and in the Weld->Tolerance it was used 0.000:

Yes, no doubt it works, but we find ourselves with a ring of small polygons around the edge of the welded faces, whose handling can be a bit unpractical. In addition to that, the two nearly coincident edge loops would be likely treated as hard edges, even where a soft edge is more appropriate.

Oh lord! I can't stop thinking about this issue.

I have to be wrong, otherwise we couldn't cut the mesh and create islands on AutoUV editor window.
I will take a look on this when I have time.

Okay, let me know if you find anything on the topic. As I said a few days ago, there are 3D programs that perform edge/vertex weldings (a feature that I would like to see in Wings too, btw) without distrupting the geometry and/or the UV projection of adjoining polygons