Collapse 

Menu: Mesh->Edit mesh→Collapse

The Collapse function converts coincident entities, i.e. entities that are close each other, into one.

It is possible to collapse edges, nodes, elements or the whole mesh.

• Collapse mesh collapses all the nodes of the mesh.
• Collapse edges joins nodes that are connected by edges shorter than the Import Tolerance value.
• Collapse nodes asks you to select some nodes. Nodes closer together than the Import Tolerance value are collapsed.
• Collapse elements asks you to select some elements. Then, the nodes of these elements that are closer together than the Import Tolerance value are collapsed.

Note: Entities belonging to a frozen layer (see Layers and groups (only Preprocessing)) are not checked when collapsing.