Glass opacity?

[RevitGary]

I am using max 2009. I have glass sliders on 3 sides of my model. If you look thru the glass to the interior everything is fine. ( I have used sky portals.) If the camera is o the front lawn looking into the interior and thru the interior to the back lawn, the landscape in the back yard is very dark.

 

The model has large glass sliders on 3 sides. How do I get the back lawn and follaige to lighten up when viewed thru two sets of glass sliders?

 

Thanks

[Justin Hunt]

can you post an image,

 

Either the glass is too dark so by looking through several layers of dark glass whats behind will be dark

 

or

 

The refraction trace depth is too low, casing the glass to turn black once the rays have hit this level. ie the trace depth should be hiugher than the number of sides of glass.

 

jhv