3d分形算法生成树的demo ， OpenGL + vs2008-3d fractal algorithm spanning tree demo, OpenGL+ vs2008

可以对本体图采用最小生成树进行简化，并采用引力法进行布局和绘制。其中绘制采用 OpenGL提供的功能。-This project can visualize ontology graph by minimum spanning tree. It takes force methods to layout the graph. It renders by OpenGL graph libraries.