How to merge all coincident vertices in a mesh.
Coincident vertices are merged and normals are averaged at the merged vertices.
This tool is only needed in rare cases. For example, a file imported from a different system, in a format other than STL, could have all its shared vertices stored twice. This could be detected within the Mesh Repair tool by the presence of a red boundary surrounding each triangle. In that case, the vertices must be merged with Mesh Weld Vertices before using any other Mesh tool.
Coincident vertices are merged and normals are averaged at the merged vertices.