Superficies paramétricas

Modelo paramétrico: \[ \left\{ \begin{array}{lcl} x & = & [h + a \cos(v)] e^{w u} \cos(c u) \\ y & = & R [h + a \cos(v)] e^{w u} \sin(c u) \\ z & = & [k + b \sin(v)] e^{w u} \end{array} \right. \] onde \(u \in [u_{min}, u_{max}]\), \(R \in \{-1,1\}\), \(v \in [0, 2 \pi]\) e \( a, b, c, h, k, w \in \mathbb{R}\).


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