For the simulations of the Ara Pacis, an ancient altar of peace, the designers used the photo texture method. The whole of the temple was photographed and the photos assigned to the individual structural parts. The DIALux program was then used to provide an exceptionally realistic impression. One of the focal points of the simulation was the analysis of the ideal angle of incidence for the relief, to check the formation of shadows resulting from the protruding frieze, and to integrate the luminaires perfectly within the architecture. An external view at night was created using the photo texture of the Travertin wall panels. The model was also used for daylight simulations. The building was embedded into the environment in an image processing program. The accessible areas in the building were documented with their illuminance levels and in the form of Isolux curves.