<br><br><div><span class="gmail_quote">On 9/25/05, <b class="gmail_sendername">Herbert Voss</b> <<a href="mailto:LaTeX@zedat.fu-berlin.de">LaTeX@zedat.fu-berlin.de</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
geotal wrote:<br><br>> Thanks. pst-vue3d is excellent.<br><br>indeed<br><br> > Now instead of a sphere,<br>> I would like to plot the circular paraboloid f(x,y) = x^2 + y^2,<br>> clipped (bounded) by the plane z = 1, which resembles a bowl, close to a
<br>> semi-sphere.<br>><br>> I have looked at the code of the sphere and semi-sphere in pst-vue3d to<br>> see if I could define the paraboloid but it is<br>> beyond me.<br><br>a parametrical plot with a limited z value is easy
<br><br>x(t,u) = a sqrt(u/h) cos t<br>y(t,u) = a sqrt(u/h) sin t<br>z(t,u) = u<br><br>u=[0;1], t=[0;360) a is the radius at the height h</blockquote><div><br>
Thanks, Hebert.<br>
<br>
I can understand your example, and will build upon it. It is especially<br>
useful for outline type drawings of paraboloids.<br>
<br>
geotal<br>
</div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">\documentclass[12pt]{article}<br>\usepackage{pst-3dplot}<br>\begin{document}<br><br>
\psset{xunit=5cm,yunit=5cm}<br>\begin{pspicture}(-1,-1)(1,1)<br>\pstThreeDCoor[xMax=1,yMax=1,zMin=0.1,zMax=2]<br>\pstVerb{<br> /height 1 def<br> /radius 1 def<br>}<br>\parametricplotThreeD[yPlotpoints=50,plotstyle=curve](0,360)(0,1){%
<br> radius u height div sqrt mul t cos mul<br> radius u height div sqrt mul t sin mul<br> u }<br>\end{pspicture}<br><br>\end{document}<br><br><br>Herbert<br><br>_______________________________________________
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