Blurring the line between Revit API and Revit to visualize an abstraction, here is a video and code share. Perhaps it has value. One add-in picks ceilings and reports information about the lighting in the room that cannot be scheduled because Revit schedules lighting power by what it learns through the light fixture connector, which is apparent power, not dissipated power. Dissipated power is needed for some purposes. The second add-in picks ceilings to get the ceiling height and passes that information to a family plunk. The family's purpose is to visualize a detection field. The detection field geometry depends on the device hight. That gets passes to the family instance. The floating window seen in the video in both add-in examples is the same UI device concept.
Video is at youtube: https://www.youtube.com/watch?v=KCu0yLzjRgE
Code is at repository: https://github.com/akseidel/WTA_Elec
