Question-and-Answer Resource for the Building Energy Modeling Community
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I agree with Rob. If your purpose is primarily daylight autonomy calculations, then you do not need the louver system geometry. The dimensions are not needed for that, so their values are not important. If you did wish to include geometry, you could follow the method outlined in Andy's presentation to insert it into your Radiance scene, being sure to "sandwich" it between proxy polygons modified by a "BSDF" primitive referencing the appropriate XML representation. Again, the dimensions reported in the file would not be required.
There's also an earlier presentation from 2011 https://www.radiance-online.org/community/workshops/2011-berkeley-ca/presentations/day1/GW2_New_BSDF.pdf that mentions the pkgBSDF program, which extracts the geometry from the XML file if present and creates the proxy sandwich for you. In most cases, the geometry is put in the XML file by genBSDF from a complete Radiance description of the system, which someone must provide. This would also enable you to generate a tensor tree BSDF for glare analysis and so forth, but as Rob alluded, it's not for the faint of heart.
