Large exterior areas

[Stomper]

Hi I looked through some of the forum but wasn't sure what this is called

Problem is :: If I make a large outside area the computer will try to generate all the models but from working with UnrealED 3D Studio Max, Milkshape 3D, and Worldcraft for Half Life I know they divide the map in to small sections so the game play is not laggy what is this called in radient. Also does anyone have a link to some really good COD 4 Mapping tutorials they can recommend to me please.

Anyone that would be willing to help me please contact me through xfire name is

Stomper or PkStomper

[Soviet]

It's called portalling

http://www.modsonline.com/Tutorials-read-127.html

that is for cod1, but so far as I know it hasn't changed since cod1.