eliminate rays with ddo

[3dxx]

I need to delete the rays on an imported math si wf4.
with the ddo there is a method that I have seen somewhere, but I can't find anymore.
Can someone tell me how to proceed?
thanks in advance for the help.

 

[maxopus]

I posted a movie long ago, below the link:
http://www.cad3d.it/forum1/video.php?do=viewdetails&videoid=116

 

[3dxx]

I didn't find it, I was convinced I had to do it with the ddo.
thanks for the answer