TYPE: SOP State
TITLE: UVBrush Operation

The UVBrush operation allows you to interactively manipulate the
texture coordinates of your geometry.

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

Like all the brush tools, you have two different brushes: your Foreground brush
and your Background brush.  You brush with your foreground brush using the LMB
and the background with the MMB.  The dilation factor is controlled by the "FS"
and "BS" parameters respectively.  

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:

- Drag: This drags the uv textures in the direction of the brush
  stroke.
- Dilate/Contract: This uses the dilation factor (either FS or BS) to
  enlarge or reduce the area under the brush.  UV Textures are moved
  away or towards the center of the brush.
- Smooth: This smoothly blends the textures coordinates.  Boundrary
  points are left unchanged.
- Erase Changes: Thus is a local undo - it restores the positions under
  your brush to the pre-uvbrush values.

The other main parameters are:

- Radius: The size of the brush.
- Opacity: How strong the brush is.  A fully opaque brush replaces the
  original positions, 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 painting crinkly geometry.

See also: Comb, Paint, Sculpt
