I’m sure some of you will have a clever way of dealing with this problem.
When you create an object with glass in it, there are often some scenes you want it to be translucent and others where you want it to be opaque. In a perspective interior scene you might want to see the effect of sunlight coming through glass. But when you show elevations, you don’t necessarily want to see interior detail as it tends to confuse the image.
I can think of complicated ways of doing this. You could have two versions of a window (say) ascribed to different layers (oops, I mean tags) and have the appropriate one visible for the scene. But is there a more elegant way than doubling up on geometry?