Face Corner select mode is used to select individual corners of a face. A [i]face corner[/i] is one of several data points contained in a face, which associates vertices with faces, and stores numeric attributes unique to that region of the face. The list of attributes is defined by the document's [link=vertex_format]Vertex Format[/link]. Additionally, a face corner includes a value specifying how the normal vector at that position is computed. See [link=normal_type]Normal Type[/link] for more details.

When in Face Corner select mode, face corners are hit detected using a combination of the mechanics of [link=select_mode_face]face[/link] and [link=select_mode_vertex]vertex[/link] hit detection. The mouseover region for a face corner is a radius around that corner's vertex, bounded by the face itself.

Clicking the [!keybind]left mouse button when a face corner is moused over will deselect all other face corners and select that face corner. Holding the [!keybind]Shift key will toggle the selected status of the moused over face corner. Face corners are the finest granularity of geometry selection, and their selection behavior is not affected by [link=inclusive_mode]Inclusive Mode[/link].

Pressing the [!keybind]Tab key in Face Corner select mode will cycle through all face corners in the order listed within each face, and cycle through faces in numerical order. Holding the [!keybind]Shift key will cycle in reverse.