I am trying to quantify the direction of total exterior glazing. The goal is to produce a Revit schedule as shown in the attached graphic. I have been successful in getting normals for each curtain panel, then comparing them with the X axis vector to get the direction of each panel.
X axis being the East direction. The problem is this:
The normals sometimes face the exterior (as desired), but sometimes face the interior, which is incorrect. Any suggestions of how to control the Exterior / Interior of curtain panels?