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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.2 Final//FR"><!-- Converted with LaTeX2HTML 95.1 (Fri Jan 20 1995) --><!-- by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds --><!-- Modified Simulog 03/97 --><HTML><HEAD><TITLE>1.1 Introduction</TITLE><LINK REL=STYLESHEET TYPE="text/css"	HREF="./Modulef.css" TITLE="Modulef CSS"><meta name="description" value="1.1 Introduction"><meta name="keywords" value="Guide6"><meta name="resource-type" value="document"><meta name="distribution" value="global"></HEAD><BODY BGCOLOR="#FFFFFF"><P> <IMG SRC="../icons/smallmod.gif" WIDTH=211 HEIGHT=50 ALIGN=BOTTOM	ALT="Modulef"><A NAME=tex2html1054 HREF="node48.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/previous_motif.gif"	ALT="previous"></A><A NAME=tex2html1060 HREF="node48.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/up_motif.gif"	ALT="up"></A><A NAME=tex2html1062 HREF="node50.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/next_motif.gif"	ALT="next"></A><A NAME=tex2html1064 HREF="node2.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/contents_motif.gif"	ALT="contents"></A><A HREF="../Guide6-18/node49.html"><IMG BORDER=0 SRC="../icons/zoom18.gif" ALIGN=BOTTOM	ALT="[BIG]"></A><A HREF="../Guide6-14/node49.html"><IMG BORDER=0 SRC="../icons/zoom14.gif" ALIGN=BOTTOM	ALT="[Normal]"></A><A HREF="../Guide6-10/node49.html"><IMG BORDER=0 SRC="../icons/zoom10.gif" ALIGN=BOTTOM	ALT="[small]"></A><BR><B> Next: </B> <A NAME=tex2html1063 HREF="node50.html">5.2 Aim and utilization limits</A><B>Up: </B> <A NAME=tex2html1061 HREF="node48.html">5 Visualization of surfaces</A><B> Prev: </B> <A NAME=tex2html1055 HREF="node48.html">5 Visualization of surfaces</A><B><A HREF="node2.html"	>Contents</A></B><HR SIZE=3 WIDTH="75&#37;"><H1><A NAME=SECTION04610000000000000000>1.1 Introduction</A></H1><P><P><P>The present module is used to visualize a function <b>F(X,Y)</b> in the form of a surface<b>Z = F(X,Y)</b> defined on a rectangular grid. Different possibilities are offered to the user to define the function.<P>We obtain a three-dimensional representation of the function by using  a hidden-linesalgorithm  of Williamson. The surface is represented using lines or a grid.<P>All  data typed at the terminal can be saved on file; this file can then be used  by the moduleto execute the session at a later stage.<P>The  utilization of the software is essentially interactive (conversational)<FONT color="#B8860B" SIZE=-1><I>(<IMG ALIGN=middle SRC="../icons/foot_motif.gif"	ALT="[note]"> While usingthis module, the user will note that it differs appreciably from  the other graphics modules due to historicalreasons.)</I></FONT><P>Tools for  plotting the reference axes automatically are included in the software. The user can alsowrite legends on the plot (using the software characters).<P>Preprocessor <b> VIS3XX</b> is used to visualize a  surface.<P><P><P><HR SIZE=3 WIDTH="75&#37;"><IMG SRC="../icons/smallmod.gif" WIDTH=211 HEIGHT=50 ALIGN=BOTTOM	ALT="Modulef"><A NAME=tex2html1054 HREF="node48.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/previous_motif.gif"	ALT="previous"></A><A NAME=tex2html1060 HREF="node48.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/up_motif.gif"	ALT="up"></A><A NAME=tex2html1062 HREF="node50.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/next_motif.gif"	ALT="next"></A><A NAME=tex2html1064 HREF="node2.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/contents_motif.gif"	ALT="contents"></A><A HREF="../Guide6-18/node49.html"><IMG BORDER=0 SRC="../icons/zoom18.gif" ALIGN=BOTTOM	ALT="[BIG]"></A><A HREF="../Guide6-14/node49.html"><IMG BORDER=0 SRC="../icons/zoom14.gif" ALIGN=BOTTOM	ALT="[Normal]"></A><A HREF="../Guide6-10/node49.html"><IMG BORDER=0 SRC="../icons/zoom10.gif" ALIGN=BOTTOM	ALT="[small]"></A><BR><B> Next: </B> <A NAME=tex2html1063 HREF="node50.html">5.2 Aim and utilization limits</A><B>Up: </B> <A NAME=tex2html1061 HREF="node48.html">5 Visualization of surfaces</A><B> Prev: </B> <A NAME=tex2html1055 HREF="node48.html">5 Visualization of surfaces</A><B><A HREF="node2.html"	>Contents</A></B><BR> <HR><P><ADDRESS></ADDRESS></BODY></HTML>
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