===== Select zero level on Z =====

This function can be found in [[меню_математика|Mathematics menu]], it is desined to shift the //Z// zero level. If you use [[анализ_выделенных_областей|Selected area analisys]] function, you can use this operation to calculate objects height and volume more accurately, because objects height in [[анализ_выделенных_областей|Selected area analisys]] is calculated from the zero //Z// level.

Select the area corresponding to the substrate background level. This can by a small square area near the object of interest or a big one with a very complex shape. Select the comand **Select zero level on Z**:

{{:en:processing:setz0_en.jpg|Select zero level on Z comand from Mathematics menu}}

And the //Z// axis will be shifted to such a height that the volume of the selected area will be close to zero value.