How is glass made transparent in FSX, and how does it differ from FS9? My reason for asking came up on Saturday when I loaded the FS9 Project Open Sky P-8A Poseidon into FSX. The plane worked fine in FSX except that the cockpit windows were opaque dark gray. In FS9 the windows were transparent and you could easily see the flight crew. I came across a DXT3 texture file named "cockpit gray", a 32x32 pixel dark gray square with a pure white alpha channel. I thought hmm... let me try something. So I darkened the alpha in DXTBmp and the glass became clear. In FS9 the glass is clear with the original pure white alpha, so what's the difference? 
