thank you for your advices. I noticed that there are many texture types, such as no draw, skip, clusterportal and so on under texture/common. I am not very clear about that, Do you have any tutorials about how to use them? I will appreciate that!

what a pity that such attractive feature doesn't work, recently, most of my time was spent on how to reduce the time of compiling a .map file. I learned that proper use of hint brush and detail brush might be a solution, and I also found your former thread whose topic is : Advanced Portal and Hintin...

the bigger and more complex map is made, the more time you need to compile. it's very inconvenient and time-consuming only to test part of it. So the information from GTKRadiant Official Manual "working with regions" provieds a way to solve such problem(here is the link: http://icculus.org...

About the proper use of Region? Presently it is becoming very clear that I have to use the GTKradiant Region command (here for v1.4 ) to let me more quickly change/test/fix the lighting, the full map compiles simply take far too long (light 800+s). It seems you can select a area via brush in top/do...