Collapse Faces
To virtually collapse faces into edges or vertices, in the Geometry toolbar, from the Virtual Operations menu (), select Collapse Faces (). Then enter the properties of the operation using the following sections:
Input
Select the faces that you want to collapse in the Graphics window. They then appear in the Faces to collapse list. If the geometry sequence includes user-defined selections above the Collapse Faces node, choose Manual to select faces, or choose one of the selection nodes from the list next to Faces to collapse.
Click the Active button to toggle between turning ON and OFF the Faces to collapse selections.
The operation collapses a face by removing it, merging its adjacent opposite edges or collapsing all adjacent edges, and reconnecting the adjacent faces to the resulting merged edges.
Select the Ignore merged entities check box to ignore the resulting merged edges or vertices (if possible).
By default, the Collapse to vertex tolerance list is set to Automatic. Select Manual to enter a value in the Maximum face perimeter field that appears. The default values is 0.001. This tolerance is the maximum perimeter of a face to be collapsed into a vertex.