smoothing groups. how do they work?

[poseyjmac]

ive wasted enough time googling for info on it. can anyone tell me what they do exactly and how to use them? all ive heard is they help make lighting transitions more smooth or something? i just don't know the proper usage. thanks

 

[poseyjmac]

ahh nvm. found http://www.valve-erc.com/srcsdk/Hammer/html/Smoothing_Groups.html

for some reason VERC links never show up in google when im searching