doxygen/html/marble_8cpp-source.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>pbrt: marble.cpp Source File</title>
<link href="doxygen.css" rel="stylesheet" type="text/css">
<link href="tabs.css" rel="stylesheet" type="text/css">
</head><body>
<!-- Generated by Doxygen 1.5.6 -->
<div class="navigation" id="top">
  <div class="tabs">
    <ul>
      <li><a href="index.html"><span>Main&nbsp;Page</span></a></li>
      <li><a href="annotated.html"><span>Classes</span></a></li>
      <li class="current"><a href="files.html"><span>Files</span></a></li>
    </ul>
  </div>
<h1>marble.cpp</h1><a href="marble_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 
<a name="l00002"></a>00002 <span class="comment">/*</span>
<a name="l00003"></a>00003 <span class="comment">    pbrt source code Copyright(c) 1998-2007 Matt Pharr and Greg Humphreys.</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">    This file is part of pbrt.</span>
<a name="l00006"></a>00006 <span class="comment"></span>
<a name="l00007"></a>00007 <span class="comment">    pbrt is free software; you can redistribute it and/or modify</span>
<a name="l00008"></a>00008 <span class="comment">    it under the terms of the GNU General Public License as published by</span>
<a name="l00009"></a>00009 <span class="comment">    the Free Software Foundation; either version 2 of the License, or</span>
<a name="l00010"></a>00010 <span class="comment">    (at your option) any later version.  Note that the text contents of</span>
<a name="l00011"></a>00011 <span class="comment">    the book "Physically Based Rendering" are *not* licensed under the</span>
<a name="l00012"></a>00012 <span class="comment">    GNU GPL.</span>
<a name="l00013"></a>00013 <span class="comment"></span>
<a name="l00014"></a>00014 <span class="comment">    pbrt is distributed in the hope that it will be useful,</span>
<a name="l00015"></a>00015 <span class="comment">    but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00016"></a>00016 <span class="comment">    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<a name="l00017"></a>00017 <span class="comment">    GNU General Public License for more details.</span>
<a name="l00018"></a>00018 <span class="comment"></span>
<a name="l00019"></a>00019 <span class="comment">    You should have received a copy of the GNU General Public License</span>
<a name="l00020"></a>00020 <span class="comment">    along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>
<a name="l00021"></a>00021 <span class="comment"></span>
<a name="l00022"></a>00022 <span class="comment"> */</span>
<a name="l00023"></a>00023 
<a name="l00024"></a>00024 <span class="comment">// marble.cpp*</span>
<a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="pbrt_8h.html">pbrt.h</a>"</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="texture_8h.html">texture.h</a>"</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include "<a class="code" href="paramset_8h.html">paramset.h</a>"</span>
<a name="l00028"></a>00028 <span class="comment">// MarbleTexture Declarations</span>
<a name="l00029"></a><a class="code" href="classMarbleTexture.html">00029</a> <span class="keyword">class </span><a class="code" href="classMarbleTexture.html">MarbleTexture</a> : <span class="keyword">public</span> <a class="code" href="classTexture.html">Texture</a>&lt;Spectrum&gt; {
<a name="l00030"></a>00030 <span class="keyword">public</span>:
<a name="l00031"></a>00031         <span class="comment">// MarbleTexture Public Methods</span>
<a name="l00032"></a><a class="code" href="classMarbleTexture.html#15dbb14572449536b5a1f115ed693d65">00032</a>         <a class="code" href="classMarbleTexture.html#15dbb14572449536b5a1f115ed693d65">~MarbleTexture</a>() {
<a name="l00033"></a>00033                 <span class="keyword">delete</span> <a class="code" href="classMarbleTexture.html#2171702e5983e20b8c6d4e61b9b1e8a7">mapping</a>;
<a name="l00034"></a>00034         }
<a name="l00035"></a><a class="code" href="classMarbleTexture.html#7bd6481f26bafde16af690abc1587deb">00035</a>         <a class="code" href="classMarbleTexture.html#7bd6481f26bafde16af690abc1587deb">MarbleTexture</a>(<span class="keywordtype">int</span> oct, <span class="keywordtype">float</span> roughness, <span class="keywordtype">float</span> sc, <span class="keywordtype">float</span> var,
<a name="l00036"></a>00036                         <a class="code" href="classTextureMapping3D.html">TextureMapping3D</a> *map) {
<a name="l00037"></a>00037                 <a class="code" href="classMarbleTexture.html#69a438e744761ea3e2a8027423e7f9af">omega</a> = roughness;
<a name="l00038"></a>00038                 <a class="code" href="classMarbleTexture.html#24522610baea3bb26028b548a7b9b8ad">octaves</a> = oct;
<a name="l00039"></a>00039                 <a class="code" href="classMarbleTexture.html#2171702e5983e20b8c6d4e61b9b1e8a7">mapping</a> = map;
<a name="l00040"></a>00040                 <a class="code" href="classMarbleTexture.html#61ad948cb2e48731e0e67276e1128c19">scale</a> = sc;
<a name="l00041"></a>00041                 <a class="code" href="classMarbleTexture.html#9839a55b74d65cc329ae7778e73d328e">variation</a> = var;
<a name="l00042"></a>00042         }
<a name="l00043"></a><a class="code" href="classMarbleTexture.html#7269d5122c339a059bc693cd75aa55eb">00043</a>         <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classMarbleTexture.html#7269d5122c339a059bc693cd75aa55eb">Evaluate</a>(<span class="keyword">const</span> <a class="code" href="structDifferentialGeometry.html">DifferentialGeometry</a> &amp;dg)<span class="keyword"> const </span>{
<a name="l00044"></a>00044                 <a class="code" href="classVector.html">Vector</a> dpdx, dpdy;
<a name="l00045"></a>00045                 <a class="code" href="classPoint.html">Point</a> P = <a class="code" href="classMarbleTexture.html#2171702e5983e20b8c6d4e61b9b1e8a7">mapping</a>-&gt;<a class="code" href="classTextureMapping3D.html#93dbc1e5be5a60569c66562ce65c9713">Map</a>(dg, &amp;dpdx, &amp;dpdy);
<a name="l00046"></a>00046                 P *= <a class="code" href="classMarbleTexture.html#61ad948cb2e48731e0e67276e1128c19">scale</a>;
<a name="l00047"></a>00047                 <span class="keywordtype">float</span> marble = P.<a class="code" href="classPoint.html#6101960c8d2d4e8ea1d32c9234bbeb8d">y</a> + <a class="code" href="classMarbleTexture.html#9839a55b74d65cc329ae7778e73d328e">variation</a> * <a class="code" href="pbrt_8h.html#0f06337c23a253f6f36dac935151a9d8">FBm</a>(P, <a class="code" href="classMarbleTexture.html#61ad948cb2e48731e0e67276e1128c19">scale</a> * dpdx,
<a name="l00048"></a>00048                         <a class="code" href="classMarbleTexture.html#61ad948cb2e48731e0e67276e1128c19">scale</a> * dpdy, <a class="code" href="classMarbleTexture.html#69a438e744761ea3e2a8027423e7f9af">omega</a>, <a class="code" href="classMarbleTexture.html#24522610baea3bb26028b548a7b9b8ad">octaves</a>);
<a name="l00049"></a>00049                 <span class="keywordtype">float</span> t = .5f + .5f * sinf(marble);
<a name="l00050"></a>00050                 <span class="comment">// Evaluate marble spline at _t_</span>
<a name="l00051"></a>00051                 <span class="keyword">static</span> <span class="keywordtype">float</span> c[][3] = { { .58f, .58f, .6f }, { .58f, .58f, .6f }, { .58f, .58f, .6f },
<a name="l00052"></a>00052                         { .5f, .5f, .5f }, { .6f, .59f, .58f }, { .58f, .58f, .6f },
<a name="l00053"></a>00053                         { .58f, .58f, .6f }, {.2f, .2f, .33f }, { .58f, .58f, .6f }, };
<a name="l00054"></a>00054 <span class="preprocessor">                #define NC  sizeof(c) / sizeof(c[0])</span>
<a name="l00055"></a>00055 <span class="preprocessor"></span><span class="preprocessor">                #define NSEG (NC-3)</span>
<a name="l00056"></a>00056 <span class="preprocessor"></span>                <span class="keywordtype">int</span> first = <a class="code" href="pbrt_8h.html#02648670ea7bf29f5782902cd9aa87c1">Floor2Int</a>(t * <a class="code" href="marble_8cpp.html#25e4a708c34da7176992fccafa54c732">NSEG</a>);
<a name="l00057"></a>00057                 t = (t * NSEG - first);
<a name="l00058"></a>00058                 <a class="code" href="classSpectrum.html">Spectrum</a> c0(c[first]), c1(c[first+1]), c2(c[first+2]), c3(c[first+3]);
<a name="l00059"></a>00059                 <span class="comment">// Bezier spline evaluated with de Castilejau's algorithm</span>
<a name="l00060"></a>00060                 <a class="code" href="classSpectrum.html">Spectrum</a> s0 = (1.f - t) * c0 + t * c1;
<a name="l00061"></a>00061                 <a class="code" href="classSpectrum.html">Spectrum</a> s1 = (1.f - t) * c1 + t * c2;
<a name="l00062"></a>00062                 <a class="code" href="classSpectrum.html">Spectrum</a> s2 = (1.f - t) * c2 + t * c3;
<a name="l00063"></a>00063                 s0 = (1.f - t) * s0 + t * s1;
<a name="l00064"></a>00064                 s1 = (1.f - t) * s1 + t * s2;
<a name="l00065"></a>00065                 <span class="comment">// Extra scale of 1.5 to increase variation among colors</span>
<a name="l00066"></a>00066                 <span class="keywordflow">return</span> 1.5f * ((1.f - t) * s0 + t * s1);
<a name="l00067"></a>00067         }
<a name="l00068"></a>00068 <span class="keyword">private</span>:
<a name="l00069"></a>00069         <span class="comment">// MarbleTexture Private Data</span>
<a name="l00070"></a><a class="code" href="classMarbleTexture.html#24522610baea3bb26028b548a7b9b8ad">00070</a>         <span class="keywordtype">int</span> <a class="code" href="classMarbleTexture.html#24522610baea3bb26028b548a7b9b8ad">octaves</a>;
<a name="l00071"></a><a class="code" href="classMarbleTexture.html#9839a55b74d65cc329ae7778e73d328e">00071</a>         <span class="keywordtype">float</span> <a class="code" href="classMarbleTexture.html#69a438e744761ea3e2a8027423e7f9af">omega</a>, <a class="code" href="classMarbleTexture.html#61ad948cb2e48731e0e67276e1128c19">scale</a>, <a class="code" href="classMarbleTexture.html#9839a55b74d65cc329ae7778e73d328e">variation</a>;
<a name="l00072"></a><a class="code" href="classMarbleTexture.html#2171702e5983e20b8c6d4e61b9b1e8a7">00072</a>         <a class="code" href="classTextureMapping3D.html">TextureMapping3D</a> *<a class="code" href="classMarbleTexture.html#2171702e5983e20b8c6d4e61b9b1e8a7">mapping</a>;
<a name="l00073"></a>00073 };
<a name="l00074"></a>00074 <span class="comment">// MarbleTexture Method Definitions</span>
<a name="l00075"></a><a class="code" href="marble_8cpp.html#a327196792a520cf6474d6d070066738">00075</a> <span class="keyword">extern</span> <span class="stringliteral">"C"</span> <a class="code" href="pbrt_8h.html#808e08638be3cba36e36759e5b150de0">DLLEXPORT</a> <a class="code" href="classTexture.html">Texture&lt;float&gt;</a> * <a class="code" href="bilerp_8cpp.html#a327196792a520cf6474d6d070066738">CreateFloatTexture</a>(<span class="keyword">const</span> <a class="code" href="classTransform.html">Transform</a> &amp;tex2world,
<a name="l00076"></a>00076                 <span class="keyword">const</span> <a class="code" href="classTextureParams.html">TextureParams</a> &amp;tp) {
<a name="l00077"></a>00077         <span class="keywordflow">return</span> NULL;
<a name="l00078"></a>00078 }
<a name="l00079"></a>00079 
<a name="l00080"></a><a class="code" href="marble_8cpp.html#310da60fe3129572e26e896019bb4f7f">00080</a> <span class="keyword">extern</span> <span class="stringliteral">"C"</span> <a class="code" href="pbrt_8h.html#808e08638be3cba36e36759e5b150de0">DLLEXPORT</a> <a class="code" href="classTexture.html">Texture&lt;Spectrum&gt;</a> * <a class="code" href="bilerp_8cpp.html#310da60fe3129572e26e896019bb4f7f">CreateSpectrumTexture</a>(<span class="keyword">const</span> <a class="code" href="classTransform.html">Transform</a> &amp;tex2world,
<a name="l00081"></a>00081                 <span class="keyword">const</span> <a class="code" href="classTextureParams.html">TextureParams</a> &amp;tp) {
<a name="l00082"></a>00082         <span class="comment">// Initialize 3D texture mapping _map_ from _tp_</span>
<a name="l00083"></a>00083         <a class="code" href="classTextureMapping3D.html">TextureMapping3D</a> *map = <span class="keyword">new</span> <a class="code" href="classIdentityMapping3D.html">IdentityMapping3D</a>(tex2world);
<a name="l00084"></a>00084         <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="classMarbleTexture.html">MarbleTexture</a>(tp.<a class="code" href="classTextureParams.html#ca5ac737691fa5765644683fd147acb8">FindInt</a>(<span class="stringliteral">"octaves"</span>, 8),
<a name="l00085"></a>00085                 tp.<a class="code" href="classTextureParams.html#515fcaebd83191597efb444595738411">FindFloat</a>(<span class="stringliteral">"roughness"</span>, .5f),
<a name="l00086"></a>00086                 tp.<a class="code" href="classTextureParams.html#515fcaebd83191597efb444595738411">FindFloat</a>(<span class="stringliteral">"scale"</span>, 1.f),
<a name="l00087"></a>00087                 tp.<a class="code" href="classTextureParams.html#515fcaebd83191597efb444595738411">FindFloat</a>(<span class="stringliteral">"variation"</span>, .2f),
<a name="l00088"></a>00088                 map);
<a name="l00089"></a>00089 }
</pre></div></div>
<hr size="1"><address style="text-align: right;"><small>Generated on Mon Jul 20 17:31:53 2009 for pbrt by&nbsp;
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address>
</body>
</html>