I am new to this forum. I saw people mentionng about doing the glass reflection in a different way with masking in PS. Could anyone give me a more instructions how to do it? greatly appreciate it!!! Thanks.
You can use material id’s, there are some mask scripts, or something like psd-manager. I use psd-manager, and I love it. You can search the forum for any of these solutions for a better description of there use.
These aren’t the best methods, but here’s a few more quick and easy things to try.
On a recent project, I set the v-ray object properties of my glass objects to have a -1 alpha setting and they were added to my alpha channel. For the project I used it on, it was a perfect solution at the time. It’s easy enough to select the alpha channel in photoshop, then add/subtract from the selection your windows and/or sky and save window or sky selection presets.
You could disable the lights in the Global Switches panel and disable GI in the Indirect Illumination panel, change the material to a standard Max material with 100% self-illumination with white for the diffuse color, then render a .tiff image. Select the white color in Photoshop and save that as a selection preset. If you save a V-Ray preset it’ll make it easy to switch back and forth between mask and production render settings. Also, if you save your self-illumination and glass materials (or whatever material you want to create a mask from) to a library, it’ll make it easy to swap the materials back and forth by simply clicking the material type button (which pops up the Material/Map Browser) and selecting the appropriate material from your library.
After typing all this out, I think I need to give something like psd-manager a look… 
You can use RenderMask for that task. A fantastic script that’s been around for years now. http://www.scriptspot.com/3ds-max/scripts/rendermask
thanks. Bobby will take a look
thankyou theedge & particlerealities