This example was also recorded on the archaeological site of Sagalassos. In this case the remains of a Roman villa were recorded at different stages during the excavations. Here we consider a specific layer for which 26 pictures were taken with a hand-held photo camera (Nikon F50) and scanned to PhotoCD. The on site acquisition of the images only takes a few minutes so it does not slow down the excavation process. Some of the recorded pictures can be seen on the top part of Figure 8.8. Note that in this case the geometry of the observed scene is too complex to be reconstructed from a single depth map. Therefore, in this case the 3D model was obtained by combining all the depth maps using a volumetric approach.