From BlenderWiki

[edit] Selection

There are many ways to select elements and it depends on what mode you are in as to what selection tools are available.

Region selection allows you to select groups of elements within a 2D region. The region can be either a circle or rectangle. The circular region is only available in Edit mode. The rectangular region is available in both Edit mode and Object mode.

[edit] Circular region

This selection tool is only available in Edit mode and can be activated with B, B. That is, pressing the B key twice in a row. Once in this mode the cursor changes to a dashed cross-hair with a 2D circle surrounding it. The tool will operate on whatever the current Select mode is. Clicking or dragging with the  LMB , when elements are inside the circle, will cause those elements to be selected.

You can enlarge or shrink the circle region using NUM+ and NUM- or the MW.

(Circle Region Select) is an example of selecting edges while in Edge select mode. As soon as an edge intersects the circle the edge becomes selected. The tool is interactive such that edges are selected while the circle region is being dragged with the  LMB .

If you want to de-select elements either hold  MMB or Alt LMB and begin clicking or dragging again.

For faces the circle must intersect the face indicators usually represented by small pixel squares; one for each face.

To exit this from this tool click  RMB or hit the ESCAPE key.

[edit] Edit Mode

[edit] Face Select Mode

In Face select mode, faces can be selected based on whether they are triangles, quads, or other. Hotkeys:

• CTRL-SHIFT-ALT-3 selects all triangles
• CTRL-SHIFT-ALT-4 selects all quads
• CTRL-SHIFT-ALT-5 selects all non triangle/quad faces.

These tools are also available in both the 3D view header and Toolbox Select menus.

[edit] Rectangular region

Redirects to fix

• Manual/PartI/The Interface → Manual/The Interface
• Manual/PartII/Gesture System → Manual/Gestures
• Manual/PartII/ObjectMode → Manual/Objects