@TIG : Thanx for the tip this is really helpfull. Btw, there's another question : i can cut the glass with no problem, but the frames consist group inside group (nested group structure). in pro version i can use 'solid' to solidify all frames blocks so later i can subtract with the crack volume, but what if in this case we use 'free' version. To be able to reach all the face to cut out , i have to go one by one of the group and do 'intersect' or other option is to explode everything to get the face level. Is this the right (fastest) way to do it? or maybe there's another better alternate way.
Thanx