Once a gbXML file is created, it can be opened in energy analysis tool as shown in Fig. 7. Three the rmal zones
were visualized in the software with different color. With this created as -is BIM, many analysis can be conducted.
Fig. 8 shows hourly and annual shade analysis based on the weather data in Omaha, NE. Through sun path
simulation, decision makers can have better decisions on redesign of the passive features which may include the roof
overhang, window size and location, or the orientation of the building. This will allow the winter’s warming rays,
but exclude the summer sun’s direct radiation.