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<h1>windy.cpp</h1><a href="windy_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">// windy.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">// WindyTexture Declarations</span>
<a name="l00029"></a><a class="code" href="classWindyTexture.html">00029</a> <span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; <span class="keyword">class </span><a class="code" href="classWindyTexture.html">WindyTexture</a> : <span class="keyword">public</span> <a class="code" href="classTexture.html">Texture</a>&lt;T&gt; {
<a name="l00030"></a>00030 <span class="keyword">public</span>:
<a name="l00031"></a>00031         <span class="comment">// WindyTexture Public Methods</span>
<a name="l00032"></a><a class="code" href="classWindyTexture.html#c5d17bb13f5d1027f0e31744315860e0">00032</a>         <a class="code" href="classWindyTexture.html#c5d17bb13f5d1027f0e31744315860e0">~WindyTexture</a>() {
<a name="l00033"></a>00033                 <span class="keyword">delete</span> <a class="code" href="classWindyTexture.html#b99ffa1142fa6676c20dd9830a217c66">mapping</a>;
<a name="l00034"></a>00034         }
<a name="l00035"></a><a class="code" href="classWindyTexture.html#53d371fda13d3749e66673b31f841234">00035</a>         <a class="code" href="classWindyTexture.html#53d371fda13d3749e66673b31f841234">WindyTexture</a>(<a class="code" href="classTextureMapping3D.html">TextureMapping3D</a> *map) {
<a name="l00036"></a>00036                 <a class="code" href="classWindyTexture.html#b99ffa1142fa6676c20dd9830a217c66">mapping</a> = map;
<a name="l00037"></a>00037         }
<a name="l00038"></a><a class="code" href="classWindyTexture.html#aac4822afcac6bbe9423dba0976b7c93">00038</a>         T <a class="code" href="classWindyTexture.html#aac4822afcac6bbe9423dba0976b7c93">Evaluate</a>(<span class="keyword">const</span> <a class="code" href="structDifferentialGeometry.html">DifferentialGeometry</a> &amp;dg)<span class="keyword"> const </span>{
<a name="l00039"></a>00039                 <a class="code" href="classVector.html">Vector</a> dpdx, dpdy;
<a name="l00040"></a>00040                 <a class="code" href="classPoint.html">Point</a> P = <a class="code" href="classWindyTexture.html#b99ffa1142fa6676c20dd9830a217c66">mapping</a>-&gt;<a class="code" href="classTextureMapping3D.html#93dbc1e5be5a60569c66562ce65c9713">Map</a>(dg, &amp;dpdx, &amp;dpdy);
<a name="l00041"></a>00041                 <span class="keywordtype">float</span> windStrength =
<a name="l00042"></a>00042                         <a class="code" href="pbrt_8h.html#0f06337c23a253f6f36dac935151a9d8">FBm</a>(.1f * P, .1f * dpdx, .1f * dpdy, .5f, 3);
<a name="l00043"></a>00043                 <span class="keywordtype">float</span> waveHeight =
<a name="l00044"></a>00044                         <a class="code" href="pbrt_8h.html#0f06337c23a253f6f36dac935151a9d8">FBm</a>(P, dpdx, dpdy, .5f, 6);
<a name="l00045"></a>00045                 <span class="keywordflow">return</span> fabsf(windStrength) * waveHeight;
<a name="l00046"></a>00046         }
<a name="l00047"></a>00047 <span class="keyword">private</span>:
<a name="l00048"></a>00048         <span class="comment">// WindyTexture Private Data</span>
<a name="l00049"></a><a class="code" href="classWindyTexture.html#b99ffa1142fa6676c20dd9830a217c66">00049</a>         <a class="code" href="classTextureMapping3D.html">TextureMapping3D</a> *<a class="code" href="classWindyTexture.html#b99ffa1142fa6676c20dd9830a217c66">mapping</a>;
<a name="l00050"></a>00050 };
<a name="l00051"></a>00051 <span class="comment">// WindyTexture Method Definitions</span>
<a name="l00052"></a><a class="code" href="windy_8cpp.html#a327196792a520cf6474d6d070066738">00052</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="l00053"></a>00053                 <span class="keyword">const</span> <a class="code" href="classTextureParams.html">TextureParams</a> &amp;tp) {
<a name="l00054"></a>00054         <span class="comment">// Initialize 3D texture mapping _map_ from _tp_</span>
<a name="l00055"></a>00055         <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="l00056"></a>00056         <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="classWindyTexture.html">WindyTexture&lt;float&gt;</a>(map);
<a name="l00057"></a>00057 }
<a name="l00058"></a>00058 
<a name="l00059"></a><a class="code" href="windy_8cpp.html#310da60fe3129572e26e896019bb4f7f">00059</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="l00060"></a>00060                 <span class="keyword">const</span> <a class="code" href="classTextureParams.html">TextureParams</a> &amp;tp) {
<a name="l00061"></a>00061         <span class="comment">// Initialize 3D texture mapping _map_ from _tp_</span>
<a name="l00062"></a>00062         <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="l00063"></a>00063         <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="classWindyTexture.html">WindyTexture&lt;Spectrum&gt;</a>(map);
<a name="l00064"></a>00064 }
</pre></div></div>
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