Mode:Edit Mode
Panel:Tool Shelf ‣ Tools ‣ Mesh Tools ‣ Add: Bisect
Menu:Mesh ‣ Bisect

The Bisect tool is a quick way to cut a mesh in two along a custom plane.

Use LMB click and drag to draw cut line. Once the cut is done the Operator panel gives a few options.

Plane Point, Plane Normal
The plane can be numerically adjusted for precise values.
Cuts can optionally fill in the holes created, with materials, UV maps, and vertex colors based on the surrounding geometry.
Clear Inner, Clear Outer
Cuts may remove geometry on one side.
Axis Threshold
Cut along the straight plane or along the existing geometry below the distance from the plane.



Example of a common use of bisect.


Example of bisect with the fill option enabled.