I might be doing something wrong with alpha maps. When I add an alpha map to my shader I get a hole that you can see thru. What I do in this case is that I make a copy of the object with the base color I want and place it underneath the object with the alpha map.
I have included an image to help convey much better what I am trying to explain. The white objects at the top of the image are what I am applying my shaders with textures to. The bottom ones are the objects with the shaders+textures applied. As you can see, the black background. These are the guide lines for the runway, what I want to see is the color of the runway to show up, not a hole you see thru.
I am not sure now, but am I understanding the work the alpha map is suppose to be doing?
I am definitely confused.
This is part of what I have to do to make the Battlestars Carrara compatible.