hmmm ..is it a CAD imported geometry? ..
i was looking at your file and you extruded isolated edges, I cannot see any splines as you said. Doing this gives a lot of problems with materials, I dont know why, but here in the office we often have this sort of problems importing geometry from revit or autocad. The final geometry tend to get bad xform, bad uvmapping, etc, etc ....so, try to import in a different way so you can keep the curves from cad as a spline in 3dsmax ....
or, you could extract the edges with the "create shape" button so it can be turned into a proper spline....then you should use a "sweep" modifier to make the glass fence, this way you can uvmap the glass with some noise using exact measures like mm ....
----------wait ...i was looking it again and your fence railing is a proper spline...you should use that with a sweep modifier, its a lot easier.
and your "glass boxes" geometry should had the "THIN" ticket in the material, and probably clean that mesh, because those are boxes within boxes...I don't thinks that's useful for its purpose here