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If you want to make a measure, there is are a few methods in the API that might work for you. Building::generateSkylightPattern generates a grid that covers the entire building's bounding box. The applySkylightPattern projects that pattern onto all the roof surfaces and creates sub surfaces for the skylights. If you don't like the grid that generateSkylightPattern gives you, you can make your own. This unit test shows how it all works.

Otherwise, you can draw loose geometry in SketchUp and then use the project loose geometry tool to project it onto your model.