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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>4.3 3D transformations</TITLE><LINK REL=STYLESHEET TYPE="text/css" HREF="./Modulef.css" TITLE="Modulef CSS"><meta name="description" value="4.3 3D transformations"><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=tex2html1426 HREF="node80.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/previous_motif.gif" ALT="previous"></A><A NAME=tex2html1432 HREF="node78.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/up_motif.gif" ALT="up"></A><A NAME=tex2html1434 HREF="node82.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/next_motif.gif" ALT="next"></A><A NAME=tex2html1436 HREF="node2.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/contents_motif.gif" ALT="contents"></A><A HREF="../Guide6-18/node81.html"><IMG BORDER=0 SRC="../icons/zoom18.gif" ALIGN=BOTTOM ALT="[BIG]"></A><A HREF="../Guide6-14/node81.html"><IMG BORDER=0 SRC="../icons/zoom14.gif" ALIGN=BOTTOM ALT="[Normal]"></A><A HREF="../Guide6-10/node81.html"><IMG BORDER=0 SRC="../icons/zoom10.gif" ALIGN=BOTTOM ALT="[small]"></A><BR><B> Next: </B> <A NAME=tex2html1435 HREF="node82.html">4.4 The transformations</A><B>Up: </B> <A NAME=tex2html1433 HREF="node78.html">4 Creating a 3D image</A><B> Prev: </B> <A NAME=tex2html1427 HREF="node80.html">4.2 Masks and windows</A><B><A HREF="node2.html" >Contents</A></B><HR SIZE=3 WIDTH="75%"><H1><A NAME=SECTION05430000000000000000>4.3 3D transformations</A></H1><P><P><P> This corresponds to, before performing the transformations<A NAME=3132> </A> and describing the object, to declare the start and end of operations in some way.<P><UL><LI><P><PRE> SUBROUTINE PUSH</PRE><P>indicates the<A NAME=3134> </A> start of an occurrence of an object (it stacks a unit matrix).<P> <LI><P><PRE> SUBROUTINE PREPAR</PRE><P>must imperatively terminate the<A NAME=3135> </A> sequence describing the transformations and precede the sequence describing the object (it evaluates the transformation matrix).<P><LI><P><PRE> SUBROUTINE PULL</PRE><P>must imperatively follow the<A NAME=3136> </A> sequence describing an object (returns to the called object's space). A correct calling sequence for an object must therefore have the following form:<P><PRE> CALL PUSH DEFINITION OF THE TRANSFORMATIONS CALL PREPAR SEQUENCE DESCRIBING THE OBJECT CALLED CALL PULL</PRE><P> The PUSHes and PULLs can be nested up to 8 levels in the following manner:<P><PRE> CALL PUSH ..... CALL PREPAR ..... CALL PUSH ..... CALL PREPAR ..... CALL PULL ..... CALL PULL</PRE><P><LI><P><PRE> SUBROUTINE RAZPSK</PRE><P>is used to set the transformation stack pointer to 0 <A NAME=3137> </A> (done automatically in DEVICE).<P></UL><P><P><P><HR SIZE=3 WIDTH="75%"><IMG SRC="../icons/smallmod.gif" WIDTH=211 HEIGHT=50 ALIGN=BOTTOM ALT="Modulef"><A NAME=tex2html1426 HREF="node80.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/previous_motif.gif" ALT="previous"></A><A NAME=tex2html1432 HREF="node78.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/up_motif.gif" ALT="up"></A><A NAME=tex2html1434 HREF="node82.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/next_motif.gif" ALT="next"></A><A NAME=tex2html1436 HREF="node2.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/contents_motif.gif" ALT="contents"></A><A HREF="../Guide6-18/node81.html"><IMG BORDER=0 SRC="../icons/zoom18.gif" ALIGN=BOTTOM ALT="[BIG]"></A><A HREF="../Guide6-14/node81.html"><IMG BORDER=0 SRC="../icons/zoom14.gif" ALIGN=BOTTOM ALT="[Normal]"></A><A HREF="../Guide6-10/node81.html"><IMG BORDER=0 SRC="../icons/zoom10.gif" ALIGN=BOTTOM ALT="[small]"></A><BR><B> Next: </B> <A NAME=tex2html1435 HREF="node82.html">4.4 The transformations</A><B>Up: </B> <A NAME=tex2html1433 HREF="node78.html">4 Creating a 3D image</A><B> Prev: </B> <A NAME=tex2html1427 HREF="node80.html">4.2 Masks and windows</A><B><A HREF="node2.html" >Contents</A></B><BR> <HR><P><ADDRESS></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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