REGEN command
Regenerates entities in the current viewport.
            Icon: 
Alias: RE
Description
Regenerates entities in the current viewport for optimal display and selection performance.
REGEN does the following:
         - Recalculates the location and visibility of all entities in the current viewport.
 - Reindexes the drawing database.
 - Updates the area available for zooming and panning.
 
This command displays no prompts and has no options.