Remove selection set from another selection set

[KRBeckman]

I'm wondering if there is a way to remove an entire selection set from another selection set...

 

Here's my situation I'm writing a lisp that will take everything that meets a particular critieria:

 

(setq ss (ssget "_x" (list (cons 0 "3dface")
       (cons 8 lay)
       (cons 410 "Model"))))

 

Then I'm copying everything from that selection set to a different location.

 

After that I need to apply a separate function to everything that meets that same criteria, minus what was there originally. Here's what I was trying but its not working:

 

(ssrevfc (ssdel ss (ssget "_x" (list (cons 0 "3dface")
          (cons 8 lay)
          (cons 410 "Model")))))

 

I'm guessing its becasue ss is a selection set and not an entity.

 

Is there a way to do this?

[KRBeckman]

well, if I would have done a little more searching I could have found this:

http://www.afralisp.net/autolisp/tutorials/selection-sets.php

 

And taylored it to make:

 

(repeat (sslength ss1)
   (ssdel (ssname ss1 ct) ss2)
   (setq ct (1+ ct)))

 

Chalk another one up to laziness.

[lamensterms]

Old thread, but wanted to say thanks for posting your solution KRBeckman. It came in handy.

[KRBeckman]

No problem... Glad it could help someone else too!