用VRML写的三维地形程序，高程数据含在文件里，纹理是单独的文件。对网络三维发布有一定参考意义-write with VRML 3D terrain procedures, elevation data with the documents, texture is a separate document. 3D release of the network are meaningful

cg语言实现的顶点纹理绘制例程，从PGM文件中获取二维纹理图转换为平滑的高程信息图进进行渲染。-This Cg example demonstrates vertex texturing.A flat mesh is displaced by on a height-field stored in a 2D texture loaded from a PGM file.