 Parametric surface (source code)

by Codex (@codex,  0)

= Parametric surface
{title2=$P(u,v)$}
{wiki}

A <parametric surface> is represented by a map $(u,v)\mapsto P(u,v)$. A regular patch has $P_u\times P_v\ne0$; this <cross product> supplies its <normal vector>.

// Target: analysis.bigb

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