【摘要】 三维地形生成是目前学术界及应用领域研究热点之一.重点研究三维地形可视化、交互式生成过程中,对地形编辑点的拾取问题.首先对比介绍了三维地形表现平台,指出了以VRML构建三维地形的优势,之后,讨论了以VRML构建三维地形的数据文件结构组织、VRML场景的拾取技术,给出了地形生成过程中对地形曲面局部点拾取并处理的实现思路及关键代码,解决了三维地形可视化交互式生成中的重要问题.最后,通过实例,给出了具体应用效果.更多还原

【Abstract】 3D-terrain building is one of the research hotspots in academia as well as application field (nowadays).This article put study emphases on picking up technique during the process of 3D-terrain (visualization) and interaction creation.Firstly,development platform of the 3D-terrain has been introduced contrastively;Secondly,the advantages of building 3D-terrain with VRML was mentioned;and then,the (data) file structure organization and picking up technique in VRML scene was discussed.The implemental way and key code for picking up and accessing bend surface local points are given,by which we solve the problems of 3D-terrain visualization and interaction creation.Finally,the specific application effect has been shown.更多还原