逆向工程中扫描数据点的曲面重构

针对三维扫描数据点的曲面重构技术在实际系统中的应用，提出了一种以B样条曲面为基础的曲面构造算法。已知数据点按简明行方式排列，算法产生一个连续的B样条曲面，该曲面的参数化过程不受每行数据点分布的影响。根据所传递的候选节点矢量，采用柔性间距选择，有效地减少了控制顶点数，同时应用三维图形标准以及图形函数库，在VC 6．0平台上完成了该软件的编制。通过实际系统应用验证，该算法改进了传统曲面重构方法在处理非均匀扫描数据点时曲线曲面形状的失真和运算的不稳定现象，计算简单，易于编程实现。

Surface reconstruction from scanned data points in reverse engineering

Aiming at the application of surface reconstruction technology of 3-D scanned data points in practical system, a surface reconstruction method based on B-spline was proposed. The data were assumed to be organized in a row-wise fashion, and the method produced a continuous B-spline surface. The parametrization of the surface was not affected negatively by the distribution of points in each row. By the selection based on the flexibility of a passed candidate knot vector, the number of control points was reduced effectively. As a result, the above algorithm on VC++ 6.0 platform was completed by applying 3-D graphic standard and library OpenGL. This method was verified in practical system, and the result showed that the distortion of surface shape and unsteadiness of calculation were improved on non-uniform 3-D scanned data pointes compared to the traditional methods. The method is easy to compute and program.