R - Commands  
REGION_DIP (command)
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It deletes an island from a region and it converts it into a polyline

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 Command line: REGION_DIP

 

The REGION_DIP command deletes a previously added island from a region and to convert it into a new polyline. The following prompt is displayed: Select a region: select a previously created region. If the region includes only one island, the island will be deleted; if it includes multiple islands, a prompt will ask to specify a point inside the island to be deleted and converted.

 

Also see:

REGION