1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2<HTML> 3<HEAD> 4<META http-equiv="Content-Type" content="text/html; charset=windows-1252"> 5<META name="GENERATOR" content="Microsoft FrontPage 5.0"> 6<META http-equiv="Content-Style-Type" content="text/css"> 7<LINK rel="stylesheet" type="text/css" href="../../CSS/revolution.css"> 8<TITLE>MTXFrustum</TITLE> 9</HEAD> 10<BODY> 11<H1 align="left">MTXFrustum</H1> 12<H2 align="left">C Specification</H2> 13<BLOCKQUOTE><CODE><CODE>#include <revolution/mtx.h></CODE></CODE></BLOCKQUOTE> 14<BLOCKQUOTE><CODE><CODE>void MTXFrustum (<BR> Mtx44 <EM>m</EM>,<BR> f32 <EM>t</EM>,<BR> f32 <EM>b</EM>,<BR> f32 <EM>l</EM>,<BR> f32 <EM>r</EM>,<BR> f32 <EM>n</EM>,<BR> f32 <EM>f</EM> );</CODE></CODE></BLOCKQUOTE> 15<H2 align="left">Arguments</H2> 16<DIV align="left"> 17<TABLE border="1" cellpadding="3" cellspacing="0.1"> 18 <TBODY> 19 <TR> 20<TD width="120" valign="top" align="left" bgcolor="#ffffe8"><CODE><STRONG><EM>m</EM></STRONG></CODE></TD> 21<TD width="520">New 4x4 parallel projection matrix. <code><em><strong>m</strong></em></code> may be either a <A href="../structures/Mtx44_Mtx44Ptr.html"><CODE>Mtx44</CODE></A> or a <A href="../structures/Mtx44_Mtx44Ptr.html"><CODE>Mtx44Ptr</CODE></A>..</TD> 22 </TR> 23 <TR> 24<TD width="120" valign="top" align="left" bgcolor="#ffffe8"><CODE><STRONG><EM>t</EM></STRONG></CODE></TD> 25<TD width="520">Top edge of view volume at the near clipping plane.</TD> 26 </TR> 27 <TR> 28<TD width="120" valign="top" align="left" bgcolor="#ffffe8"><CODE><STRONG><EM>b</EM></STRONG></CODE></TD> 29<TD width="520">Bottom edge of view volume at the near clipping plane.</TD> 30 </TR> 31 <TR> 32<TD width="120" valign="top" align="left" bgcolor="#ffffe8"><CODE><STRONG><EM>l</EM></STRONG></CODE></TD> 33<TD width="520">Left edge of view volume at the near clipping plane.</TD> 34 </TR> 35 <TR> 36<TD width="120" valign="top" align="left" bgcolor="#ffffe8"><CODE><STRONG><EM>r</EM></STRONG></CODE></TD> 37<TD width="520">Right edge of view volume at the near clipping plane.</TD> 38 </TR> 39 <TR> 40<TD width="120" valign="top" align="left" bgcolor="#ffffe8"><CODE><STRONG><EM>n</EM></STRONG></CODE></TD> 41<TD width="520">Positive distance to near clipping plane.</TD> 42 </TR> 43 <TR> 44<TD width="120" valign="top" align="left" bgcolor="#ffffe8"><CODE><STRONG><EM>f</EM></STRONG></CODE></TD> 45<TD width="520">Positive distance to far clipping plane.</TD> 46 </TR> 47 </TBODY> 48</TABLE> 49</DIV> 50<H2 align="left">Return Values</H2> 51<P align="left">None.</P> 52<H2 align="left">Description</H2> 53<P>Sets a 4×4 perspective projection matrix from viewing volume dimensions. This matrix is used by the <code>GX API</code> to convert points to screen space.</P> 54<P>For typical perspective projections, the axis of projection is the -z axis, so <code><em><strong>t</strong></em></code> = positive, <code><em><strong>b</strong></em></code> = <code>-<em><strong>t</strong></em></code>,<em><strong> <code>r</code></strong></em> = positive,<em><strong> <code>l</code></strong></em> = <code>-<em><strong>r</strong></em></code>. <CODE><EM><STRONG>n</STRONG></EM></CODE> and <CODE><EM><STRONG>f</STRONG></EM></CODE> must both be positive values representing the distance to the near and far clipping planes, respectively.</P> 55<P><B>Note:</B> <CODE><EM><STRONG>m</STRONG></EM></CODE> must possess a negative "Z" value in order to make converted points visible after projection in view space.</P> 56 57 58<H2 align="left">See Also</H2> 59<P align="left"><A href="../structures/Mtx_MtxPtr.html"><CODE>Mtx44, Mtx44Ptr</CODE></A>, 60<A href="MTXOrtho.html"><CODE>MTXOrtho</CODE></A>, <CODE><A href="MTXPerspective.html">MtxPerspective</A></CODE> </P> 61<H2>Revision History</H2> 62<P>2006/03/01 Initial version.</P> 63<hr> 64<P>CONFIDENTIAL</p> 65</BODY> 66</HTML>