Nice chandelier. Glad it worked. But now you have me confused [:)]. It seems transparency can be achieved in two ways. Either

1. d value in the .mtl file (and I assume AoI should be able to handle that directly?).
2. using g sweethome3d_window_pane_xxx in the .obj file. This I did not know. Does it add anything to the mtl d value? Legacy approach from before full .mtl support?
   [/list=1] But then I am wondering whether sweethome3d_window_mirror_xxx (reflection) can also be achieved with .mtl. Only reference I could find, was the Constant Field Values, but alas, I am none the wiser.
   
   ok
   
   PS. Win is a strange beast. If it weren't for some vital software, I ditch it in a sec. However, if you open-with / drag-drop your .mtl files into an editor (Notepad/PSPad), surely the default doesn't change (?)