(interest (COMMAND [args]))
*matches any value.
nilmatches any value but supresses the reporting of that value; its value is reported as
The purpose of the interest command is to allow external
modules to find out about things happening inside geomview.
For example, a module interested in knowing when a geom called
foo is deleted could say
(interest (delete foo)) and would
receive the string
(delete foo) when foo is deleted.
Picking is a special case of this. For most modules interested in pick
events the command
(interest (pick world)) is sufficient. This
causes geomview to send a string of the form
(pick world ...)
every time a pick event (right mouse double click). See the
(pick ...) command for details.