I did the editing and rendering.
I've noticed that:
Glass in SH3D looks good in the 3d pane, even the color modification.
For the (best and 2nd best) rendering, it's a different story: The glass named sweethome3d_window_pane looks like a proper glass (transparent) while the one that just had the mtl edited by adding:
d 0.15 looks more solid, not transparent.
Even with the mtl edited (as per sree's instructions) as:
Kd 0.784 0.337 0.368
Ka 0.784 0.337 0.368
Ni 2.5
d 0.86
also renders in the best and 2nd best setting as solid, no transparency, while in the fast and next to fast renders as transparent as it should (but, of course, not with realistic looking lighting).
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3glass-bestsetting.png
(136440 bytes)
(Download count: 1676)
(best rendering setting vs. fast rendering setting.)----------------------------------------
3glass-EXP.png
(50778 bytes)
(Download count: 1658)
(best rendering setting vs. fast rendering setting.)