据此，推出具有空间曲线的异型截面构件的三维造型数学公式，可供产品设计及绘图软件二次开发使用。
And then the math formulae for three dimensional moulding of a special section member with space curves have been derived which could be used for product design and development of drawing software.
论证了两曲面的交线为空间曲线，其方程为一元四次隐函数关系式；
It is proved that the intersecting line of the two curved surface is space curve, and the equation is quartic implicit function with one unknown.
同时它还能精确表示圆弧、椭圆弧等二次曲线，推广到空间即可以表示旋转曲面。
Also the curves can express the circle arc and ellipse arc and can construct rotate surfaces.
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