Use the following options to set what happens when you select Edit Mesh > Merge.
The following options are available when edges are selected.
Merges the UVs shared by the edges. If turned off, the UVs are not merged and can be manipulated and edited independently. The default setting is on.
Any selected edges further apart than this distance will not be merged. Set this value carefully. If it’s too small, no edges will merge. If it’s too large, the operation may merge unwanted selected edges. The default is 0.01.
Determines the threshold distance between edges in different coordinate systems.
(Default) Specifies that the Threshold value is the distance between edges in world space.
Specifies that the Threshold value is the distance between edges in local space.
The following options are available when vertices are selected.
Any selected vertices further apart than this distance will not be merged. Set this value carefully. If it’s too small, no vertices will merge. If it’s too large, the operation may merge unwanted selected vertices. The default is 0.01.
When two vertices are selected, they are merged regardless of the Threshold value.