[Radiance-general] BSDF question

[Giuseppe De Michele]

Dear all,

I am working with the 3 phase method (only from a few weeks) and I am
trying to understand the BSDF file format and how the 3 phase method read
it.

 I have noticed that if I use the bsdf created with the command:
genBSDF -n 4 +f +b -geom meter material.rad blinds.rad > blinds.xml
the .xml file contain same geometrical dimension (height, width). In fact
if I use the command:
pkgBSDF -s blinds.xml > blinds_pkg.rad
the output file contain the original geometry.

Instead if I use the BSDF created or contained  in the database of WINDOW 7
these file do not contain a geometry.
With pkgBSDF I got an error.

My questions are:
1.  in the equation i=VTDs the T matrix has to contain the window geometry
or take knowledge of these from the other two matrix(V,D)?
2.  I have understood that 3 phase method uses only the front transmission
data [A. McNeil, Three-Phase Method tutorial]  but in
 an other discussion [
http://www.radiance-online.org/pipermail/radiance-general/2012-October/008969.html
]  I have discovered that WINDOW and genBSDF use an opposite meaning of
front and back, so the front transmission regards radiance or window
meaning?And what part of the T matrix I have to use in the 3 phase method
for the respective cases (WINDOW or genBSDF)?

Kind regards,
*Giuseppe*
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