file-native opacity settings are rarely supported by 3d modeling programs, so an opacity map is needed. an easy way is to set the texture's brightness to 100% and saturation to 0% (to get a completely white semi-transparent texture) and place it over a black layer. thus, an opacity map is made!
they are actual textures, they just have an alpha channel that isnt supported, making it opaque.
they are actual textures, they just have an alpha channel that isnt supported, making it opaque.