The four aspects is as follow:(1) Modelling a free curved surface from the orthogonal projections and the normal vectersof controlling points.
这四个方面分别是：（1）已知数据点的正投影和曲面上数据点处的法线方向，构造自由曲面；
The four aspects is as follow:(1) Modelling a free curved surface from the orthogonal projections and the normal vectersof controlling points.
这四个方面分别是：（1）已知数据点的正投影和曲面上数据点处的法线方向，构造自由曲面；
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