The sculpting tools allow you to grab, pinch and smooth UVs, just like for meshes in Sculpt Mode. It can be activated with selecting either the Grab, Relax, or Pinch tool in the Toolbar.
The Data-Block Menu to select a preset brush type or a custom brush.
The Grab brush moves UVs around.
The Relax brush makes UVs more evenly distributed. The algorithm relies on space, not stretch minimization, so most probably a minimize stretch will have to be run for optimal results. However it is great to use after stitching islands, or when unwrap produces cluttered results to smooth the distribution of UVs.
- Relaxation Method
There are two relax algorithms:
The Pinch brush moves UVs toward the brush’s center. The pinch brush can be inverted by pressing Ctrl-LMB.
This option controls the radius of the brush, measured in pixels. F allows you to change the brush size interactively by dragging the mouse and then LMB. Typing a number then enter while using F allows you to enter the size numerically.
- Size Pressure
Brush size can be affected by enabling the pressure sensitivity icon, if you are using a Graphics Tablet.
- Use Unified Radius
Use the same brush Radius across all brushes.
Controls how much each application of the brush affects the UVs. You can change the brush strength interactively by pressing Shift-F in the 3D Viewport and then moving the brush and then LMB. You can enter the size numerically also while in Shift-F sizing.
- Use Unified Strength
Use the same brush Strength across all brushes.
All brushes use the Airbrush Stroke Method; they continue to act as long as you keep LMB pressed.
When UV sculpting is activated, the Sidebar shows the brush tool selection and options.
- Lock Borders
Locks the boundary of UV islands from being affected by the brush. This is very useful to preserve the shape of UV islands.
- Sculpt All Islands
To edit all islands and not only the island nearest to the brush center when the sculpt stroke was started.
- Display Cursor
Hides the sculpt cursor.