虚拟地理环境中三维符号设计研究 关键字：虚拟地理环境；三维符号；视觉变量；设计原则 [gap=384]Key words: virtual geographic environments; 3D symbol; vision variables; principle of design
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三维符号的自动建模是三维符号设计的难点，也是提高三维场景建模速度的关键。
Automatic modeling is the most difficult in 3D symbol designing, and it's import key of quckly modeling scene.
出售了月球尘埃之后，拉尼尔小赚了一笔，他继续研究名叫“后符号”的视觉编制语言（vpl），它可以用来在三维空间中控制物体。
Having made some money from selling Moondust, he continued to work on a “post-symbolic” visual programming language (VPL) for manipulating objects in three-dimensional space.
实践证明，利用该方法建立常用的三维统计地图符号库，并将其应用于专题地图的制作，能取得良好的效果。
The practice proved to apply that the method establish 3D statistic map symbols library in common use, and application to the making of thematic map could get better effect.
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