blender.org - Vertex Loop Select

Loopselect is activated either from the select menu or pressing alt-B in edit mode.

The loopselect tool starts from the nearest edge. It performs several tests on the edges that it connectes to.

It checks to see if it connects to only 3 other edges.
If the edge in question has already been added to the list, the selection ends .
Of the 3 edges that connect to the current edge, the ones that share a face with the current edge are eliminated and the remaining edge is added to the list and is made the current edge.

The selection is confirmed with a left click and an optional modifier. The modifiers are as follows.

No Modifier - Replace Current Vertex Selection
Shift-Click - Add to Current Selection
Alt-Click - Subtract from Current Selection

Here is an example of a full loop.

Here is a partial loop, ending at 2 edges that only connect to 2 other edges.

The edge of a cube loops like a loop but is not by the definition used.

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