Baking lightmaps part by part

Good morning friends I hope you are well. I have a little bit question on my mind about prograssive lightmapper. I made a dungeon escape game environment with parted models and I have a lots of torch which uses baked lighting and I used gpu lightmapper for baking lights normally it was taking 30-50 sec for every room but after adding another more rooms it tooks much more time in the end it was taking 20-17 min and whenever I add small object like chest to any room I have to wait whole lightmapping. Is there a any way to bake lights part by part room by room? Thanks for listening my newbie question =).

 

Thanks mate =) thats the what exactly I was looking for =)

 

The link is no longer available, how can we bake different rooms separately to decrease baking time?

 

Thank you, it worked!