This windows are making me thirsty!

[Joost Ink]

doesnt matter in what you model it, as long you make sure you are not shining light on a flipped face.
If you modeled it right, you do not need 2-sided mat. for glass.
besided that it also takes longer render times if you use 2-sided materials.
Vray can not handle 2-sided glass material.

I remember an issue about this on here long time ago about this..

[Bowcat]

Da_Elf,

Here is the scene:
http://www.guidogarfunkel.com.ar/temp/062.rar

[Bowcat]

Solved it!

It has nothing to do with vray. vray is perfect. It's just stupid me.
I had some of the windows with gi off in system, and then group them. When I turned gi on, apperently, not all of the windows turned on.

Please, clear this topic for ever!!!

[obeth]

Joost -
it does matter where you model the geometry if you can't get it into max without getting the geometry screwed up