Well, I learned the hard way, that I cannot bake transparent objects, like glass or ice, in Cycles (per BE thread from Oct 2014). I get the usual black or white opaque texture map (when using invert).
Anyways, I’ve seen traces that this was possible in Blender Internal. Can anyone explain what I need to know to bake such maps, and what type of map would it be; would it just be an alpha map?
I’m wanting to preserve my glass/ice materials when importing into other applications like Unity.