Hi to all!
It is not hard create a model that has a transparent part, like a window or a door with a glass, without tga texture, for those that they have 3dgs from the release 6.4 in MED is possible through
material setup, make a part of a model transparent, for example a window, of wood or of iron, create the glass easily, choose the texture of the mesh that must represent the glass, and with the material editor ---> material setup ---> skin setting ---> alpha bring the value to 35- 40% and then apply the texture to the glass mesh.

greet

salva