REVERSE allows you to change the normals of a grouped
polygon mesh. This capability is particularly useful when
shading is used.

Choose the grouped polygon mesh you want in one of the
following ways:

- by entering a group name (BY NAME) 

- by selecting an entity (SELECT). 

If the selected entity does not belong to a group, you are 
prompted to press <Enter>. In this case, return and group 
the entities using EDIT, GROUP options.

The normals of the grouped polygons are automatically
reversed in the database.
