For many operations, it's useful to select individual poly islands (a set of contiguous faces within the mesh), especially when your model is made of physically separate meshes, like the default car mesh in Mudbox.
To select all faces of a poly island
- In the Select/Move Tools tray, select the Faces tool
. (Hotkey: V) - Double-click a poly island.
Mudbox selects all contiguous faces. (Any previous selection is no longer selected.)
Tip: To add a poly island to the current selection, Shift + double-click. Ctrl + double-click to deselect the poly island again.