The ordinary style of the curve projectionequation and the formule of some kinds of the curve projection as well as the examples for its application are given.
给出了曲线投射方程关系的一般式，导出几种曲线投射的投影关系式并举例说明。
2
The algorithm used the resultant method to computing the intersection's projectionequation and deal with the projectionequation through decomposition and so on.
该算法首先利用结式法计算出两二次曲面相交时交线的投影方程，再对投影方程进行分解等处理。
3
The equation can be used in all cases of perspective projection.