1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2<html> 3 4<head> 5<META http-equiv="Content-Type" content="text/html; charset=windows-1252"> 6<META name="GENERATOR" content="Microsoft FrontPage 5.0"> 7<META http-equiv="Content-Style-Type" content="text/css"> 8<LINK rel="stylesheet" type="text/css" href="../../../CSS/revolution.css"> 9<title>tf-tg-mtx</title> 10</head> 11 12<body> 13 14<h1 align="left">tf-tg-mtx</h1> 15 16 17 18<h2>Description</h2> 19 20<p><CODE>tf-tg-mtx</CODE> uses all default texture matrices to test texture coordinate generation. The following texture coordinate schemes are tested. (Texture coordinates) * (Identity matrix)<BR>(Position coordinates) * (3x4 matrix) : Texture projection<BR>(Texture coordinates) * (2x4 matrix) : Texture transform<BR>(Normal vector) * (3x4 matrix) : Reflection mapping<BR><BR>The <CODE>GX_IDENTITY</CODE> matrix is always transforming the center cube for comparison. Since this would result in Q=0 for projection and reflection mapping, the center cube is not drawn for those cases.</p> 21 22<p>It is important to note for the reflection mapping area, the normals of the cube have been bent outward to resemble those of a sphere. We would have used a sphere model except that it is very hard to tell when a reflection-mapped sphere is rotating.</p> 23 24<h2>Coverage</h2> 25<TABLE border="1" cellpadding="3" cellspacing="0.1" width="640"> 26 <tr> 27<TD width="30%" bgcolor="#C0C0C0"><EM><STRONG>Function</STRONG></EM></TD> 28<TD width="25%" bgcolor="#C0C0C0"><EM><STRONG>Parameters</STRONG></EM></TD> 29<TD width="45%" bgcolor="#C0C0C0"><EM><STRONG>Description</STRONG></EM></TD> 30 </tr> 31 <tr> 32<TD width="30%" rowspan="3"><a href="../../../gx/Transform/GXLoadTexMtxImm.html"><FONT face="Courier New">GXLoadTexMtxImm</FONT></a></TD> 33<TD width="25%">Matrices</TD> 34<TD width="45%">different matrix sent down for each cube</TD> 35 </tr> 36 <tr> 37<TD width="25%">matrix destination</TD> 38<TD width="45%"><FONT face="Courier New">GX_TEXMTX0</FONT> - <FONT face="Courier New">GX_TEXMTX9</FONT></TD> 39 </tr> 40 <tr> 41<TD width="25%">Matrix type</TD> 42<TD width="45%"><CODE>GX_MTX2x4</CODE> or <CODE>GX_MTX3x4</CODE> depeneding on generation type.</TD> 43 </tr> 44 <tr> 45<TD width="30%" rowspan="4"><FONT face="Courier New"><a href="../../../gx/TexCoordGen/GXSetTexCoordGen.html">GXSetTexCoordGen</a></FONT> </TD> 46<TD width="25%">Destination coordinates.</TD> 47<TD width="45%">Always <FONT face="Courier New">GX_TEXCOORD0</FONT>.</TD> 48 </tr> 49 <tr> 50<TD width="25%">texgen type</TD> 51<TD width="45%"><CODE>GX_TG_MTX3x4</CODE> or <CODE>GX_TG_MTX2x4</CODE> depending on generation type.</TD> 52 </tr> 53 <tr> 54<TD width="25%">texgen src</TD> 55<TD width="45%"><FONT face="Courier New">GX_TG_TEX0</FONT>, <FONT face="Courier New">GX_TG_POS</FONT>, <FONT face="Courier New">GX_TG_NRM</FONT></TD> 56 </tr> 57 <tr> 58<TD width="25%">Matrix input source.</TD> 59<TD width="45%"><FONT face="Courier New">GX_TEXMTX0</FONT>-<FONT face="Courier New">GX_TEXMTX9</FONT>, <FONT face="Courier New">GX_IDENTITY</FONT></TD> 60 </tr> 61</TABLE> 62<h2>Operation Method</h2> 63 64<p>START exits the demo.</p> 65 66<p>The B Button stops/starts cube rotation.</p> 67 68<p>The X Button changes the texgen method.</p> 69 70<h2>Snapshot</h2> 71 72<p>No texgen. The texture coordinates are all transformed by an identity matrix.</p> 73 74<P><IMG src="./images/tf-tg-mtx-1.jpg" alt="tf-tg-mtx-1.jpg (13420 bytes)" WIDTH="400" HEIGHT="308"></p> 75 76<p>Projected texture.</p> 77 78<P><IMG src="./images/tf-tg-mtx-2.jpg" alt="tf-tg-mtx-2.jpg (11105 bytes)" WIDTH="400" HEIGHT="295"></p> 79 80<p>Texture transform.</p> 81 82<P><IMG src="./images/tf-tg-mtx-3.jpg" alt="tf-tg-mtx-3.jpg (14086 bytes)" WIDTH="400" HEIGHT="296"></p> 83 84<p>Reflection mapping.</p> 85 86<P><IMG src="./images/tf-tg-mtx-4.jpg" alt="tf-tg-mtx-4.jpg (11953 bytes)" WIDTH="400" HEIGHT="295"></p> 87 88<h2>Data Files Required</h2> 89 90<p><FONT face="Courier New">$REVOLUTION_SDK_ROOT/dvddata/gxTests/tf-02.tpl</FONT></p> 91<H2>Revision History</H2> 92<P>03/01/2006 Initial version.</P> 93</body> 94</html>
