# [pstricks] Hyperbolic Paraboloidal for Rafael's Thesis

Rafael Castro Triguero me1catrr at uco.es
Mon Oct 30 17:54:46 CET 2006

Poul Riis escribió:
> Well, the following is probably somewhat closer to what you want.
>
> Yours,
> Poul Riis
>
> \documentclass[a4paper]{article}
>
> % \usepackage{pst-all} % Para trabajar con Pstricks
> % \usepackage{pdftricks}
>  \usepackage{pst-3dplot}
> % \usepackage{pst-vue3d}
> % \usepackage{pst-math} % Permite trabajar con funciones matemáticas
> % \usepackage{pst-infixplot} % Permite trabajar con fórmulas igual que
> MATLAB
> % \usepackage{pst-poly} % Para trabajar con polígonos
> % \usepackage{pst-blur} % Para dibujar sombras más suaves
> % \usepackage{pst-circ} % Permite trabajar con circuitos eléctricos
>
> \begin{document}
> \begin{pspicture}(-1,3)(-1,3)
> \psset{THETA=60,PHI=10,Dobs=60,Decran=40,dLight=1e9,Alpha=30,Beta=10}%Alpha=90-THETA,Beta=PHI
>    \pstThreeDCoor[xMin=-1,xMax=4,yMin=-1,yMax=4,zMin=-1,zMax=3.5]
> \parametricplotThreeD[xPlotpoints=10,yPlotpoints=10,linecolor=green,linewidth=0.25pt,plotstyle=curve](-2,2)(-2,2){t
> u -1}
> \parametricplotThreeD[xPlotpoints=10,yPlotpoints=10,linecolor=green,linewidth=0.25pt,plotstyle=curve](-2,2)(-2,2){u
> t -1}
> \parametricplotThreeD[xPlotpoints=10,yPlotpoints=10,linecolor=blue,linewidth=0.5pt,plotstyle=curve](-2,2)(-2,2){t
> u t dup mul u dup mul sub 5 div}
> \parametricplotThreeD[xPlotpoints=10,yPlotpoints=10,linecolor=blue,linewidth=0.5pt,plotstyle=curve](-2,2)(-2,2){u
> t u dup mul t dup mul sub 5 div}
>
>  \end{pspicture}
>
> \end{document}
>
>
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I have tried this and I get something like I was looking for but the
parametric formulas are

x = u + t
y = u - t
z = u * t

and with those I can't get good results. Where is the error?

\begin{pspicture}(-3,-3)(3,3)
\psset{Dobs=60,Decran=40,Alpha=30,Beta=10}%Alpha=90-THETA,Beta=PHI
\parametricplotThreeD[xPlotpoints=10,yPlotpoints=10,linecolor=blue,linewidth=0.25pt,plotstyle=curve](0,3)(0,3){t
u t u mul 0.2 mul}
\parametricplotThreeD[xPlotpoints=10,yPlotpoints=10,linecolor=blue,linewidth=0.25pt,plotstyle=curve](0,3)(0,3){u
t u t mul 0.2 mul}
\pstThreeDCoor[xMin=-1,xMax=4,yMin=-1,yMax=4,zMin=-1,zMax=3.5]
\end{pspicture}

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PhD. Student Rafael Castro Triguero
University of Córdoba
Polithecnical School
Menéndez Pidal Avenue
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