well… read the Grasshopper notes and found the answer:
We are adding two window groups for
this study. The skylight is its own window group
which is not dynamic but we’re interested
to study its contribution separately.
South window is the other window group
which has two states: 1. clear, 2. diffuse50
Ensure that window groups are facing outwards.
Honeybee flips the surfaces for view
matrix calculation internally.
Window groups are under ./scene/wgroup