Box Mask

Ссылка

Режим (mode):

Режим скульптинга (sculpt mode)

Инструмент (tool):

Toolbar ‣ Box Mask

Creates a new Mask based on a box selection. Hold Ctrl to subtract from the mask instead.

This tool is also accessible as a shortcut operator on B.

Настройки панели «Инструмент» (tool settings)

Только лицевая сторона

Only creates a mask on the faces that face towards the view.