Abstract:With the continuous development of society, the people have increasingly higher expectations for living comfort, and the obstruction of indoor daylighting by surrounding buildings is an important factor affecting residential comfort. By studying the basic principle of sunshine, the main factors affecting the sunshine are analyzed. The sunshine simulation function is developed based on Unity. Combined with the actual elevated engineering project, BIM modeling and the oblique photography aerial photography are used to simulate the actual three-dimensional space scene, and the most unfavorable sunshine simulation is carried out in Unity. Finally, the impact of the design of elevated bridges on the residential buildings is quantitatively analyzed, which provides the effective guidance for optimizing the design schemes of the elevated engineering, fills the blank of sunshine analysis and simulation in the elevated engineering field and has the strong practical application value.