Special Geometry
Selection > Special Geometry
 

Description:

      The Special Geometry (Selection > Special Geometry) submenu allows you to select different types of geometry with special characteristics. If you are in object selection mode and no objects are selected, these commands will apply to all geometry in the scene. Otherwise it will only apply to that geometry which has been selected in object selection mode, regardless of which selection mode you are currently in. If the command selects faces, then the selection mode will be changed to face selection mode, and if the command selects edges, the selection mode will be changed to edge selection mode.

Select Non-4-Sided Faces
    This option will select all faces which have either more or less than four sides.

Select Non-3-Sided Faces
    This option will select all faces which have more than four sides.

Select Over-4-Sided Faces
    This option will select all faces which have more than four sides.

Select Over-2-Faced Edges
    This option will select all edges which have more than two faces attached. This is known as non-manifold geometry and can cause subdivision errors, disallow boolean and shell operations, and cause other difficulties.


Notes:

- These tools are designed in part to help locate potential problem areas, depending on the purpose of your model.