Useful daylight studies begin before facade design. At concept stage, the most important variables are massing depth, courtyard proportion, spacing to surrounding objects, orientation, and the height-to-distance relationship between volumes.

Windows can improve a room, but they cannot fully solve a massing decision that already blocks the useful sky. A simple shadow and sun-path check early in the process makes later facade decisions more honest.

The practical workflow is to test seasonal exposure, identify persistent shadow zones, and decide whether the design needs a massing move, not just a glazing change. SunPath is the first BUGO tool built around that workflow.