Edit UVs > Merge UVs

 
 
 

Use Merge UVs to merge together separate UV shells. Merge UVs has a similar effect to Sew UVs. However, Merge UVs is better suited to merging shells when the polygon has non-manifold geometry.

For example, when you have three UV shells that all share an edge because the geometry is nonmanifold, Merge UVs can combine two of the UV shells without affecting the other. If you used Sew UVs in this example, all shells would be combined because they all share an edge.

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Edit UVs > Merge UVs >

Threshold

Set the Threshold value to set the maximum distance within which selected UVs will be merged. Any UVs in the selection that exceed this distance will not be merged.