\( \boldsymbol{x}(u_{1}, v_{1}) = \begin{pmatrix} a \cosh u_{1} \hskip 0.1em \cos v_{1} \\ b \cosh u_{1} \hskip 0.1em \sin v_{1} \\ c \sinh u_{1} \end{pmatrix} \)

\( \left( - \dfrac{2 \pi}{3} \leq u_{1} \leq \dfrac{2 \pi}{3}, \, 0 \leq v_{1} \leq 2 \pi \right) \),

\( \boldsymbol{x}_{\pm}(u_{2}, v_{2}) = \begin{pmatrix} a \sinh u_{2} \hskip 0.1em \cos v_{2} \\ b \sinh u_{2} \hskip 0.1em \sin v_{2} \\ \pm \hskip 0.1em c \cosh u_{2} \end{pmatrix} \)

\( \left( \dfrac{\pi}{18} \leq u_{2} \leq \dfrac{2 \pi}{3}, \, 0 \leq v_{2} \leq 2 \pi \right) \)

\( a = \) , \( b = \) , \( c = \) 更新

\( (0.1 \leq a, b, c \leq 10) \)