On the Development of CAD system for Representing Historic Ruins

1.本项目的目标有两个：一是确定用于支持发掘研究或调查研究的历史遗迹或建筑遗迹三维图形表示系统的功能框架；二是为原型系统开发必要的软件，该原型系统将在高速三维彩色图形显示终端上运行。在开发研究过程中，使用了开罗城的al-Fustat遗址和其他几处建筑遗址作为案例。原型系统的主要功能如下：(1)使用现场记录的图纸或草图等文件作为信息来源，生成和记录数字数据，以描述形成废墟或遗迹的元素的三维位置和形状。(2)生成挖掘现场或建筑遗址的透视图像。该系统将允许用户自由选择立点和视点以及t…更多选择要在视图中显示的元素，以便他们可以直观地体验挖掘或测量的过程。(三)提供分析工具，估计原始结构或历史遗迹或建筑遗迹的建造过程。该项目的报告总结了以下内容：(1)描述遗址或遗迹要素的四种模型：(2)以挖掘文件或调查文件为来源生成数字数据的过程：(3)案例研究中产生的系统图形输出的实例：(4)分析工具的使用实例：(5)开发的原型系统的评估。我们指出，由于使用的描述方法的性质，传统的文件，如二维图纸，不一定能完整地记录废墟的三维结构或完整的遗迹。我们认为，三维图形表示系统能够提供常规文献所缺乏的全部信息，只要重新组织挖掘和测量的方法，三维图形表示系统就可以提供一个模拟挖掘过程的环境。较少

1. In this project we have two objectives: firstly, to define functional framework of 3-dimensional graphic representation system of historic ruins or architectural remains, which can be used to support excavation studies or survey studies: secondly, to develop necessary soft wares of the proto-type system which will be operated with a high-speed 3-dimensional color graphic display terminal. During the process of development sutdies, excavation at al-Fustat in the of Cairo city and several other architectural ruins were used as the case.2. Major functions of the prototype system are following:(1)to generate and record digital data to describe 3-dimensional locations and shapes of elements that forms ruins or remains using documents, such as drawings or sketches, recorded at the site, as the source of information. (2)to generate perspective image of the excavation site or architectural ruins. Users of the system will be allowed to select standing point and view point freely as well as t … More o select elements to be displayed in the view, so that they could visually experience a process of excavations or surveys. (3)to provide analytical tools to estimate original structure, or the process of construction of historic ruins or architectural remains.3. The report of this project has summarized on the following:(1)four models to describe elements of ruins or remains:(2) process to generate digital data using excavation documents or survey documents as the source:(3) examples of graphic output of the system produced in the case study:(4) example of the use of analytical tools:(5) evaluation of the prototype system developed.4. We pointed out that conventional documents, such as 2-D drawings, could not necessarily record 3-dimensional structure of ruins or remains fully, because of the nature of the descriptions method they used. We concluded that 3-dimensional graphic representation system will be able to provide full information conventional documents lacked, and that if only methods of excavation and surveys were reorganized, 3-dimensional graphic representation system could provide an environment to simulate a process of excavation. Less