<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">I beginning to learn (very slowly) the working of pst-solides3d, using an adaptation of the Moebius band example on the melusine.eu.org website. Here is the part of the code I am working on (the first line makes sure TeXShop uses ghostscript+latex, not pdflatex; the commented package calls are ones I might like to make later):<div>**************************************************************</div><div><div>%!TEX TS-program = latex</div><div><br></div><div>\listfiles</div><div>\documentclass[11pt]{article}</div><div>%\usepackage{amsmath, amssymb}</div><div>\usepackage[dvipsnames, svgnames]{pstricks}</div><div>\usepackage{pst-plot, pst-math, pst-3dplot}</div><div>\usepackage{pst-grad, pst-func, pst-text}</div><div>\usepackage{pstricks-add}</div><div>\usepackage{pst-solides3d}</div><div><br></div><div>%\usepackage{graphicsmacros}</div><div>%\usepackage{basicmacros}</div><div>%\usepackage{calculusmacros}</div><div><br></div><div>\title{Brief Article}</div><div>\author{The Author}</div><div><br></div><div>\begin{document}</div><div>\maketitle</div><div>\begin{figure}[htbp]</div><div>\begin{center}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\begin{pspicture}(-6,-3)(6,3)</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psset{unit=1.5}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\defFunction{mobius}(u,v)</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>{2 u v Cos mul add 2 v mul Cos mul}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>{2 u v Cos mul add 2 v mul Sin mul}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>{u v Sin mul}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psset[pst-solides3d]{viewpoint=20 10 5,Decran=40,lightsrc=0 10 10}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psSolid[object=surfaceparametree,linewidth=0.75\pslinewidth,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>base=0.2 0.25 0 pi,linewidth=0.1,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>function=mobius,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>ngrid=.025]</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psSolid[object=surfaceparametree,linewidth=0.75\pslinewidth,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>base=-0.25 -0.2 0 pi,linewidth=0.1,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>function=mobius,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>ngrid=.025]</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psSolid[object=surfaceparametree, linewidth=0.5\pslinewidth,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>base=-0.25 0.25 0 pi, fillcolor=lightgray!50, incolor=white!50,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>function=mobius,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>ngrid=.05]</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\end{pspicture}</div><div>\caption{Moebius Band}</div><div>\label{fig:Moebius}</div><div>\end{center}</div><div>\end{figure}</div><div><br></div><div><br></div><div><br></div><div>\end{document}</div><div>*******************************************************************************************</div><div>This creates a reasonable facsimile of the picture on the website (except that I have changed th e colors, and added a lightsource---a primary reason to use this package). </div><div><br></div><div>However, several items puzzle me:</div><div><br></div><div>1. Where do the limits on the parameters u and v get set? If I want the width of the band to</div><div>change, where do I modify the code?</div><div><br></div><div>2. what does the !50 after the colors do?</div><div><br></div><div>3. What is the role of base=...?</div><div><br></div><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; "><br class="Apple-interchange-newline">Zbigniew Nitecki</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Department of Mathematics</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Tufts University</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Medford, MA 02155</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><br></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">telephones:</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Office<span class="Apple-converted-space"><span class="Apple-converted-tab"> <span class="Apple-converted-space"> </span></span></span>(617)627-3843</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Dept.<span class="Apple-converted-space"><span class="Apple-converted-tab"> <span class="Apple-converted-space"> </span></span></span>(617)627-3234</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Dept. fax<span class="Apple-converted-space"><span class="Apple-converted-tab"> <span class="Apple-converted-space"> </span></span></span>(617)627-3966</font></p><a href="http://www.tufts.edu/~znitecki/">http://www.tufts.edu/~znitecki/</a></span> </div><br></div></body></html>