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You can use WINDOW7.4 for that (no need for OPTICS). As you already mentioned, you would have to put one glass layer that you can create in WINDOW. Just put 1.0 for solar and visible transmittances (it is important to put for both of them). Then create IGU with two shades and perfectly transmitted glass in between. Latest step would be to create Report->Energy Plus BSDF IDF (the only way to get BSDF matrices printed out). Note that if you turn debugging on, WINDOW will create Debug folder with layer by layer BSDF, which would be good way to check if data that WINDOW is using are correct.

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No.2 Revision

You can use WINDOW7.4 for that (no need for OPTICS). As you already mentioned, you would have to put one glass layer that you can create in WINDOW. Just put 1.0 for solar and visible transmittances (it is important to put for both of them). Then create IGU with two shades and perfectly transmitted glass in between. Latest step would be to create Report->Energy Plus BSDF IDF (the only way to get BSDF matrices printed out). Note that if you turn debugging on, WINDOW will create Debug folder with layer by layer BSDF, which would be good way to check if data that WINDOW is using are correct.

Updated: You do have to go into OPTICS, make a 100% transmittance glazing. Import that into WINDOW and use that as the layer for the above procedure.