The 3D Cut and Sew UV Tool allows you to create or stitch seams on UV shells right in the viewport, instead of through the UV Editor. When using the tool, you can do the following:
Use these options to set what happens when you select
UV > 3D Cut and Sew UV Tool > 
Brush
- Steady Stroke
- Activating this automatically smooths out your mouse strokes. Useful if you have an unsteady hand or when working in tight spaces on the model.
- Distance
- Determines the width of jitter to smooth out when Steady Stroke is enabled.
- Symmetry
- Mirrors cut or sew operations across the chosen axis of symmetry.
Display
- Show checker map
- Displays a checker map texture on the selected UV shell.
- Show texture borders
- Bolds the chosen UV shell's texture borders. You can adjust the color of the borders using the color swatch.
- Show UV shell coloring
- Displays an overlay color on top of the UV shell that corresponds to the same colored shell in the UV Editor.
Keyboard/Mouse Shortcuts
| Hotkey | Operation |
|---|---|
| Click | Cut UV edge or highlighted UV edges. |
| Drag | Cut UVs |
| Shift + drag | Cut UVs constrained to an edge loop. |
| Double-click | Cut UV edge loop. |
| Shift + double-click | Cut a UV edge loop from the first selected edge to the second double-clicked edge. |
| Hold Tab | Activate UV Edge Loop selection constraint. |
| Ctrl + click | Sew UV edge or highlighted UV edges. |
| Ctrl + Shift + drag | Sew UVs constrained to an edge loop. |
| Ctrl + double-click | Sew UV edge loop. |
| Ctrl + Shift + double-click | Sew a UV edge loop from the first selected edge to the second double-clicked edge. |
| X | Cut highlighted or selected edges.
|
| S | Sew highlighted or selected edges.
|
| D | Unfolds highlighted UV shell, then performs a Layout operation. |
| Shift + D | Unfolds highlighted UV shell. |