TYPE: SOP State
TITLE: Comb Operation

Combing allows you to interactively orient the normals of your geometry.

As you move the mouse over the geometry, you will see a circular brush follow
the surface to show where you would comb.  The size of this brush and its
orientation will show you which points will be affected by a comb operation.

Like all the brush tools, you have two different brushes: your Foreground brush
and your Background brush.  You comb with your foreground brush using the LMB
and the background with the MMB.  

Each of the brushes also can have its own independent operation.  To select the
operation for each brush, Ctrl-RMB to bring up the operation menu.  The options
are:

- Comb Normals: In this mode, the normals of your geometry will tilt
  in the direction your brush is dragged.
- Smooth Normals: The normals under the brush are smoothed out to
  remove any sudden changes in their direction.
- Erase Changes: Thus is a local undo - it restores the normals under
  your brush to the pre-comb values.

The other main parameters are:

- Comb Lift: How flat the normals should lie on the surface.  0 is
  flat on the surface, 1 is standing upright, and -1 standing downright.
- Radius: The size of the brush.
- Opacity: How strong the brush is.  A fully opaque brush replaces the
  original normal, while a less opaque brush blends it.

The other Ctrl-RMB Menu options are:

- Circle/Square/Bitmap Brush: The shape of the brush.  The bitmap is
  set in the operation parameters dialog.
- Orient Brush To Surface: When disabled, the brush is always oriented
  the same way.  This is useful when combing crinkly geometry.
- Accumulate to Stencil: This advanced option is described in more
  detail in the manual.

See also: Paint, Sculpt, UVBrush
