What would be the point for that? Glass object with predefined shape? You mean like Window glass or spherical glass?
Who would really take time to fit some shape in tho shape of this windows?
If you mean "Glass Material" well, the materials are so easy to use at this point that once again I see no point in bothering in even making that.
How is this going to benefit anyone? You can just add Glass material to any object you like, and VrayFur is quite pointless as corona offers great CoronaScatter, takes 2 min more time to make a carpet but its performance is way better.
