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These two menu items should help in estimating if solar reflection will occur. Intended for working with solar panels that are represented as 3D Faces the result is the direction of the sun expressed horizontally as a whole circle bearing  (i.e. south = 180 degrees ) and  vertically as the angle above the horizontal. If the sun is in this position there will be a reflection assuming that the observer is within a visible area identified by a ZTV analysis.

 

The 3D Face could also represent a window or metal roof for example.