| 摘要 |
PURPOSE: To apply the three-dimensional graphic data structure to an optional three-dimensional graphic system by showing the graphic data structure in the hierarchical data where a body, the structure elements and the polygons are linked together. CONSTITUTION: The three-dimensional graphic data are stored in an object- oriented data base. The linkage relation of objects is shown by a chart in a hierarchical data structure where a body object has the component element (parts) objects and the component element objects have the polygon objects respectively. The body object shows the body data and the contents data on a three-dimensional graphic subject in a single object. At the same time, the component element objects of the subject body are shown in a list structure. The component element objects show the parts data and the contents data on the subject body in a single object. Then the polygon objects are shown in a list structure and furthermore contain the position data and the number of vertexes constructing the polygons. |
