Based on the analysis of Vega, the callback technology of OpenGL is used, and the Chinese characters two-dimension display and three-dimension display in Vega are realized. 在对Vega研究的基础上,采用OpenGL回调技术,实现了Vega中汉字的二维及三维显示。
However, most of these systems were using two-dimension ( 2D) display form for pipe-network observation and management which can not show the depth information. 但这些系统大多使用二维显示的方式来实现对管网的管理,无法实现对管网纵深的显示。
Currently, most applications use two-dimension GIS to design, but reality is a real three-demension space, so can not display reality. 目前,在城市规划方面主要采用二维GIS来进行平面设计和应用,但是现实世界是真实的三维空间,故不能较好的显示真实世界。