Walking Through Model?

DEADscott

Hi, I am an inexperienced mapper. I know nothing of modeling. I am using Jaeger's dropship model. I use monster_furniture to add it to my map. I can see it, but I also can walk "pass through" it like it wasnt there. I must be tired or just plain dumb, but I cant figure out how to fix this. Any help would be great

watch_me_die

Use clip brushes to make the area solid <!--emo&:)--><img src='http://www.unknownworlds.com/forums/html/emoticons/smile.gif' border='0' style='vertical-align:middle' alt='smile.gif'><!--endemo-->

DEADscott

Thank you.