1.3.1 Three Dimensional Information

1.3.1 Three Dimensional Information Acquisition and Digital Survey Drawing RecordIn the 1990s, three dimensional laser scanning and photogrammetry have been applied to the records of ancient architecture. The 21st century, considering the three- dimensional information collection can not contact with cultural relics, can be collected positive photographic images and other advantages, interior decoration information collection began to refer to this method. At the same time, due to the high precision of digital drawings, digital survey information easy to edit and other advantages, when the Tianjin University surveyed the Summer Palace in 2005, Tianjin University research team used the method of computer graphics to focus on recording interior decoration, not only in the section on the detailed drawing, while painting the pattern of a single separator. (Figure 8) In the subsequent restoration of the Fuwangge, scholars added different patterns which means different damages to the digitized drawings to record the damaged condition. (The Forbidden City Museum, 2014)