Select All by Trait
Non-Manifold
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Mode:
Edit Mode
Menu:
Select ‣ Select All by Trait ‣ Non-Manifold
Selects the Non-manifold geometry of a mesh. This entry is available when editing a mesh, in Vertex and Edge selection modes only.
Extend
Lets you extend the current selection.
Wire
Selects all the edges that do not belong to any face.
Boundaries
Selects edges in boundaries and holes.
Multiple Faces
Selects edges that belong to three or more faces.
Non Contiguous
Selects edges that belong to exactly two faces with opposite normals.
Vertices
Selects vertices that belong to wire and multiple face edges, isolated vertices, and vertices that belong to non-adjoining faces.
Loose Geometry
Reference
Mode:
Edit Mode
Menu:
Select ‣ Select All by Trait ‣ Loose Geometry
This selection depends on the currently selected Selection Modes; In vertex and edge selection mode it selects all vertices or edges that do not form part of a face. In face selection mode it selects all faces that do not share edges with other faces.
Interior Faces
Reference
Mode:
Edit Mode
Menu:
Select ‣ Select All by Trait ‣ Interior Faces
Selects faces where all edges have more than two faces.
Faces by Sides
Reference
Mode:
Edit Mode
Menu:
Select ‣ Select All by Trait ‣ Faces by Sides
Selects all faces that have a specified number of edges.
Ungrouped Vertices
Reference
Mode:
Edit Mode
Menu:
Select ‣ Select All by Trait ‣ Ungrouped Vertices
Selects all vertices which are not part of a vertex group.