并对其生成的表面几何模型所包含三角面片数量巨大的问题，提出一种快速有效的三角形边收缩算法进行网格简化，提高了表面模型的绘制速度。

Because 3D surface model contains huge number of triangles, a mesh simplification algorithm based on triangle edges shrinkages is presented in this paper to speed up the rendering in real time.

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利用抽取轮廓边的算法将边跟踪算法从CAD模型扩展到一般的面片模型。

Extending the type of model in edge-based tracking from CAD model to general mesh model by extracting the silhouette from the 3D model.

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