Undo 
Edit > Undo (Ctrl+Z)
 

Description:

      Undo (Edit > Undo) is implemented in Silo much like in any other program - when you perform an action such as dragging a face or rotating an edge or performing a boolean operation between two shapes, you can reverse the effects of that action by calling this command from the Edit Menu (Edit > Undo) or with the hotkey command Ctrl+Z. 


Notes:

-Certain actions cannot be undone, such as assigning materials to a face or changing certain preferences.  All actions that change the geometry of shapes can be undone.

-You can change the number of undos available to you by setting the Undo Level field in the General Options window (Options > General Options).  A higher number in this field lets you undo more commands but requires more memory.

-There is also a Redo (Edit > Redo) command available to redo whatever action you undid with Undo.