How to reduce unnecessary leaves?

Im making large simple map. vbsp split my map to too many leaves, so vvis have to work too long times. I want to reduce leaves and vvis works more faster.

I used glview to see how vbsp split leaves in my map, and i found that there are too many unnecessary leaves. I know that vbsp split leaves every 1024 units.

Please tell me
how to let vbsp splits leaves every 4096 or 8192 unit
or
how to disable splitting leaves every 1024 unit and split only by brush and hint brush
or
anything reduce unnecessary leaves.

Thanks.

 

this site might help you: http://www.student.kun.nl/rvanhoorn/Optimization.htm
hes got some wicked ms paint skills

edit: Nice to see you on the forums dame

 

Try using hintbrushes, it should work.

 

From Valve Wiki:

So you can't deal with the 1024 cut size. Use func_detail over all detail brushes that won't stop visibility. That's the only thing you can do to reduce leaves, hintbrushes will make new cuts.

 

Thanks you.
I converted most of world brushes to func_detail, and many leaves have disappeared.(from about 14000 numportals to 2000 numportals)

But i dont think vbsp spliting map properly. There are still unnessecery leaves. If there is no way to change how vbsp splitting map, I will try to hack *.prt file.

 

AFAIK, bsp will always split every 1024 units. That's just what it does. Unless you were going to re-write the entier compile tools.

 

I know that.
I think it is possible to write program that generate *.prt file from *.vmf file by reading information about HINT. Both file are ascii format, and i know what they means.

My plan is...
1, vbsp read vmf file and output bsp file and prt file.
2, run my program that read vmf file and override prt file.
3, vvis process prt file which my program generated.
4, run vrad and etc...

but, i dont enough time to do that.

 

Isn't .PRT just made for LEAK tracing? I don't think that modifiying the .prt will help you on this.

 

The .prt file, or portal file, is used to create portal generation info, editing it without knowing what you're doing might cause the compile to crash.
Also, leafs larger than 1024 units may create problems, such as objects going invisible or the level crashing.

 

You can know prt file format from this site.
http://developer.valvesoftware.com/wiki/PRT

I tried to overwrite prt file of my map.
I wrote 3 leaves in my map, and I can compile my map successfully.
But when loading that map, hl2.exe got crashed!

 

Thats what i mean with editing it without knowing what you're doing.