How define outside shade elements with venetian blinds?    
   I want to model a double windows with its outside layer with wood venetian blinds. I thought that with blind-window-material in Open Studio shoul be the solution, but then i saw an image 
, where is explained that the software assume this material inside the glass layer, and i would like to put outside. As the image (but with wood venetian blinds) Anyone can help me to  model this option? 

 
 
