Simulating Fritted Glass

Hi everyone

I am trying to run a glare and daylight simulation on a space which has glazing with a fritted pattern. The way I have tried to model the glazing so far is by having Grasshopper construct the individual fritted surface patterns onto the glazing surfaces in Rhino. The problem I am having is that since the frit density is 50% and the size of the circular frit patterns are very small - this means that Grasshopper must construct 100’s of thousands of surfaces and this causes it to run for an extremely long period of time and eventually crash. I have considered adjusting the VLT or opacity of the glazing to represent a fritted glass panel, however I do not know how to calculate the equivalent VLT of a glazing with 50% frit density.

Some of the research I have done toom me to this article in which fritted glass was simulated using Radiance “trans material”.

In summary - does anyone have any ideas about:

  1. Alternate ways of simulating Fritted Glazing
  2. Estimating VLT based on a frit Density
  3. Using Radiance Trans Material