大场景VRML在OpenGL中的实现——以北京市西城区为例

Visualization of huge VRML scene by openGL

在建立数字北京时,为了利用现有的北京市西城区VRML格式的三维模型数据,分析了VRML的文件格式,并将该格式的数据转入到OpenGL编程易于实现的格式中。基于该数据量之大,将转出的数据变换到绝对坐标系中,从而实现了模型的动态调度和显示,并在OpenGL编程中实现。

In construction of Digital Beijing,for making the best of the current 3D model data of the VRML format,we analyze this format,and translate the format into the new one which is easy to be programed by OpenGL.Considering their huge amount,we change the output data into new data of the absolute reference frame,and then we realize that the dynamic 3D models are shown or loaded according to the viewpoint.