I've created a very simple application that generates
WindowMaterial:Glazing and Construction objects with U, SHGC, and, if
desired, visual transmittance values as specified by the user. I
stumbled upon the algorithm used to accomplish this in the EnergyPlus
engineering manual, where it is described as being part of an upcoming
object. Because I've always wished EnergyPlus could do this, I decided
to create an application to act as a surrogate until this feature was
officially added. Anyone interested can download the application here: