I often need to model lenses or diffuser plate with some texture grains applied on some part of it. Normally it’s called out as Mold-tech or VDI texture grain, which are commonly used for surface diffusing optical elements.
The question is how do I apply that correctly in the Zemax optical model. Is there any DLL library for that or should I use Gaussian or AGg to approximate that? Problem is there is no available data to correlate such scatter model to Mold-tech definitions.
I found this post in an internet search. Recently I have run into the same problem. I wonder if you have found a solution.
Johnson,
Unfortunately I still don’t have solution to this task yet. No one seems to have DLL library or ABg parameters for MT unless I missed something out there.
I think it would take measuring BSDF out of flat sample of MT texture and create BSDF file for Zemax from the measurement. There are KB articles on the BSDF file scattering. That’s only practical solution I can think of.
JS
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