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说明：  VTK是一个用于图像处理的开源软件系统，3D图形、体积渲染和可视化。VTK包括许多高级算法（例如，曲面重建、隐式建模、抽取）和渲染技术（例如硬件加速体积渲染，LOD控制）。(VTK is an open-source software system for image processing, 3D graphics, volume rendering and visualization. VTK includes many advanced algorithms (e.g., surface reconstruction, implicit modelling, decimation) and rendering techniques (e.g., hardware-accelerated volume rendering, LOD control).)

VTK里面的对点云进行降采样的程序，可以直接使用。(VTK point cloud inside the down-sampling procedure can be used directly.)

flac3d建模模型，是隧道施工盾构的模型，大家参考下这样的语句，互相学习，互相参考。(flac3d model we refer to such statements, learn each other, with reference to each other.)

提供hubgear的应用实例，可以更改齿轮数达到不同的效果。(The application of the provision of hubgear, you can change gear reached different results.)

Teach you the pipeline of 3D object, especially the perpective project

说明：  Zigzag和iZigzag的程序及改进的Zigzag和iZigzag的程序。后者可以大幅提高运算效率(Zigzag and iZigzag procedures and improved Zigzag and iZigzag procedures. The latter can substantially increase the computing efficiency)

d3d dll文件，3dsmax9 必不可少的文件系统，有了它，你可以尽情的徜徉在3D的世界里(d3d dll file)

说明：  给定一个图像，其中包含足够的信息来计算地平面消失线和垂直消失点，以及一个已知高度的物体。然后，只要他们的头部和脚都可见，就可以在场景中的任何地方测量站在地平面上的人的高度。(Given an image which contains sufficient information to compute the ground plane vanishing line and the vertical vanishing point, and also one object of known height for which the top and base are imaged. Then the height of a person standing on the ground plane can be measured anywhere in the scene provided that their head and feet are both visible.)

访问最底层LOD模型路径，打开后获取顶点数据和PirmitiveSet，重绘模型的三角面片(Visit the bottom LOD model path, open it, get vertex Array and PirmitiveSet, and redraw the triangle of the model.)

说明：  osg剖析教程，完整的阐述了osg一帧全过程，是一部osg入门的良好教程，且可以完整学习osg思想(osg analysis tutorial and complete description of the osg an entire process, is a good tutorial osg entry, and can complete learning osg thinking)