polyop.collapseVerts <Poly poly> <vertlist>

Collapses each cluster of vertices in the specified vertices to a single vertex.

A vertex cluster is a set of vertices that are directly connected to one another.

polyop.collapseFaces <Poly poly> <facelist>

Collapses the vertices associated with each cluster of faces in the specified faces to a single vertex.

A face cluster is a set of faces that are directly connected to one another.

polyop.collapseEdges <Poly poly> <edgelist>

Collapses the vertices associated with each cluster of edges in the specified edges to a single vertex.

An edge cluster is a set of edges that are directly connected to one another.