Knife

Drag a line to divide, delete, or group geometry.

See also: Clip, Cookie, Poly Split, Edge Divide

The Knife tool lets you drag a line in the viewport. You can then divide the geometry along the line (e.g. split polygons), or delete (clip) geometry on one side of the line. When dividing polygons, you can also put the two resulting partitions into named groups for later operations.

Using Knife

  1. Select the object you want to to divide or clip.

  2. Click the Knife tool on the Polygon tab of the shelf.

  3. Drag a line to specify the plane along which to divide/clip. You can use snapping to constrain the line.

    After you drag the line, a handle appears in the viewport representing the plane. You can drag the handle to refine the plane position and orientation.

  4. Use the Keep parameter to control what to do to with the plane:

    Keep: All primitives divides any polygons intersecting the plane. Keep: Primitives above the plane and Primitives below the plane delete all geometry on one side of the plane.

Tip

You can draw knife lines around the edges of the viewport to manually delete polygons outside the field of view to reduce scene complexity.

For specific parameter help see the Knife node help.