Judgment of C2 or C4 intersection of NURBS curve.
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# C2C4
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Judgment of C2 or C4 intersection of NURBS curve.
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## 依赖
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+ tinynurbs
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## 使用
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```C++
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C2C4 c2C4;
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// 按tinynurbs的使用方式配置好左右公有成员的NURBS曲面srf1、srf2的各项属性
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c2C4.srf1.degree_u = 2;
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...
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c2C4.srf2.degree_u = 2;
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...
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// 检查是否配置成功
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if (!surfaceIsValid(c2C4.srf1) || !surfaceIsValid(c2C4.srf2)) {
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// 曲面相关参数配置有误
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...
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return -1;
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}
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// 判断C2、C4情形，res.first表示是否为C2，res.second表示为C4
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pair<float, float> res = c2C4.c2OrC4();
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```
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+ C2情形：3*4的雅可比矩阵：存在一个2阶子式行列式非0+所有3阶子式行列式含0。
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+ C4情形：3*4的雅可比矩阵：去掉某一列后不含0（四个有一个即可）（也就是说存在一个3阶子式的行列式不含0）。若为C4，公有成员变量c4ExcludeCols中记录着去掉哪些列后子式行列式不含0
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