[Mihai]

Very nice scene! There is a current limitation with dielectrics and sunlight (or sky system in general) which means it takes a long time for the glass to clear up and illumination to show through the glass. In this case since you are interested mostly in the glass reflecting the outside environment, use a plastic material with pretty low diffuse, about RGB 30-50 for the specular value, and around 0.05-0.15 for u/v roughness depending how blurred you want the reflections to look.

[x_site]

:: wonderfull model... not so nice tree... great lighting!::

[iker]

Wow! anxious to see "Malaga" textured!
..I agree with Mihai, use Plastic for windows.

[andronikos916]

very nice scene...

make sure the glass thickness is real size!

set abbe number 200!

enable caustics...

cy,
Andronikos

[tom]

..and wait more than 2 hours

[jurX]

....nice dude,...the model looks nice to....but the tree is so lala