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<h1>distant.cpp</h1><a href="distant_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">// distant.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="light_8h.html">light.h</a>"</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include "<a class="code" href="shape_8h.html">shape.h</a>"</span>
<a name="l00028"></a>00028 <span class="preprocessor">#include "<a class="code" href="scene_8h.html">scene.h</a>"</span>
<a name="l00029"></a>00029 <span class="comment">// DistantLight Declarations</span>
<a name="l00030"></a><a class="code" href="classDistantLight.html">00030</a> <span class="keyword">class </span><a class="code" href="classDistantLight.html">DistantLight</a> : <span class="keyword">public</span> <a class="code" href="classLight.html">Light</a> {
<a name="l00031"></a>00031 <span class="keyword">public</span>:
<a name="l00032"></a>00032         <span class="comment">// DistantLight Public Methods</span>
<a name="l00033"></a>00033         <a class="code" href="classDistantLight.html#800493ea65e6b5064015f91e025a7758">DistantLight</a>(<span class="keyword">const</span> <a class="code" href="classTransform.html">Transform</a> &amp;light2world, <span class="keyword">const</span> <a class="code" href="classSpectrum.html">Spectrum</a> &amp;radiance, <span class="keyword">const</span> <a class="code" href="classVector.html">Vector</a> &amp;dir);
<a name="l00034"></a><a class="code" href="classDistantLight.html#bd88d41c6a29a56bf350b0e1f21a24c4">00034</a>         <span class="keywordtype">bool</span> <a class="code" href="classDistantLight.html#bd88d41c6a29a56bf350b0e1f21a24c4">IsDeltaLight</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <span class="keyword">true</span>; }
<a name="l00035"></a>00035         <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classDistantLight.html#2592fdfeb6fb4c1fdabec6d089f3f2d5">Sample_L</a>(<span class="keyword">const</span> <a class="code" href="classPoint.html">Point</a> &amp;p, <a class="code" href="classVector.html">Vector</a> *wi, <a class="code" href="structVisibilityTester.html">VisibilityTester</a> *) <span class="keyword">const</span>;
<a name="l00036"></a><a class="code" href="classDistantLight.html#9ebe2e5b5e2a0277856af8c824c71b76">00036</a>         <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classDistantLight.html#9ebe2e5b5e2a0277856af8c824c71b76">Power</a>(<span class="keyword">const</span> <a class="code" href="classScene.html">Scene</a> *scene)<span class="keyword"> const </span>{
<a name="l00037"></a>00037                 <a class="code" href="classPoint.html">Point</a> worldCenter;
<a name="l00038"></a>00038                 <span class="keywordtype">float</span> worldRadius;
<a name="l00039"></a>00039                 scene-&gt;<a class="code" href="classScene.html#0637bcdecbdce44660b7694685846446">WorldBound</a>().<a class="code" href="classBBox.html#89ce0fcced6eee5eb2a40ba9a510b8cc">BoundingSphere</a>(&amp;worldCenter,
<a name="l00040"></a>00040                                                    &amp;worldRadius);
<a name="l00041"></a>00041                 <span class="keywordflow">return</span> <a class="code" href="classDistantLight.html#272990a9abc46a4f5b708ecc17a6d5e7">L</a> * <a class="code" href="pbrt_8h.html#e71449b1cc6e6250b91f539153a7a0d3">M_PI</a> * worldRadius * worldRadius;
<a name="l00042"></a>00042         }
<a name="l00043"></a>00043         <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classDistantLight.html#2592fdfeb6fb4c1fdabec6d089f3f2d5">Sample_L</a>(<span class="keyword">const</span> <a class="code" href="classPoint.html">Point</a> &amp;P, <span class="keywordtype">float</span> u1, <span class="keywordtype">float</span> u2, <a class="code" href="classVector.html">Vector</a> *wo, <span class="keywordtype">float</span> *pdf,
<a name="l00044"></a>00044                 <a class="code" href="structVisibilityTester.html">VisibilityTester</a> *visibility) <span class="keyword">const</span>;
<a name="l00045"></a>00045         <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classDistantLight.html#2592fdfeb6fb4c1fdabec6d089f3f2d5">Sample_L</a>(<span class="keyword">const</span> <a class="code" href="classScene.html">Scene</a> *scene, <span class="keywordtype">float</span> u1, <span class="keywordtype">float</span> u2,
<a name="l00046"></a>00046                 <span class="keywordtype">float</span> u3, <span class="keywordtype">float</span> u4, <a class="code" href="classRay.html">Ray</a> *ray, <span class="keywordtype">float</span> *pdf) <span class="keyword">const</span>;
<a name="l00047"></a>00047         <span class="keywordtype">float</span> <a class="code" href="classDistantLight.html#d419fceba74a4e073b3eafad59d2d534">Pdf</a>(<span class="keyword">const</span> <a class="code" href="classPoint.html">Point</a> &amp;, <span class="keyword">const</span> <a class="code" href="classVector.html">Vector</a> &amp;) <span class="keyword">const</span>;
<a name="l00048"></a>00048 <span class="keyword">private</span>:
<a name="l00049"></a>00049         <span class="comment">// DistantLight Private Data</span>
<a name="l00050"></a><a class="code" href="classDistantLight.html#3430bf3a26bec8851c73e798a9652396">00050</a>         <a class="code" href="classVector.html">Vector</a> <a class="code" href="classDistantLight.html#3430bf3a26bec8851c73e798a9652396">lightDir</a>;
<a name="l00051"></a><a class="code" href="classDistantLight.html#272990a9abc46a4f5b708ecc17a6d5e7">00051</a>         <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classDistantLight.html#272990a9abc46a4f5b708ecc17a6d5e7">L</a>;
<a name="l00052"></a>00052 };
<a name="l00053"></a>00053 <span class="comment">// DistantLight Method Definitions</span>
<a name="l00054"></a><a class="code" href="classDistantLight.html#800493ea65e6b5064015f91e025a7758">00054</a> <a class="code" href="classDistantLight.html#800493ea65e6b5064015f91e025a7758">DistantLight::DistantLight</a>(<span class="keyword">const</span> <a class="code" href="classTransform.html">Transform</a> &amp;light2world,
<a name="l00055"></a>00055                 <span class="keyword">const</span> <a class="code" href="classSpectrum.html">Spectrum</a> &amp;radiance, <span class="keyword">const</span> <a class="code" href="classVector.html">Vector</a> &amp;dir)
<a name="l00056"></a>00056         : <a class="code" href="classLight.html">Light</a>(light2world) {
<a name="l00057"></a>00057         <a class="code" href="classDistantLight.html#3430bf3a26bec8851c73e798a9652396">lightDir</a> = <a class="code" href="geometry_8h.html#46448bfa3df1c2de5e3b763f163866a4">Normalize</a>(<a class="code" href="classLight.html#e405f6543d4d8ee5573183b4ca2c587e">LightToWorld</a>(dir));
<a name="l00058"></a>00058         <a class="code" href="classDistantLight.html#272990a9abc46a4f5b708ecc17a6d5e7">L</a> = radiance;
<a name="l00059"></a>00059 }
<a name="l00060"></a><a class="code" href="classDistantLight.html#2592fdfeb6fb4c1fdabec6d089f3f2d5">00060</a> <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classDistantLight.html#2592fdfeb6fb4c1fdabec6d089f3f2d5">DistantLight::Sample_L</a>(<span class="keyword">const</span> <a class="code" href="classPoint.html">Point</a> &amp;p,
<a name="l00061"></a>00061                 <a class="code" href="classVector.html">Vector</a> *wi, <a class="code" href="structVisibilityTester.html">VisibilityTester</a> *visibility)<span class="keyword"> const </span>{
<a name="l00062"></a>00062         *wi = <a class="code" href="classDistantLight.html#3430bf3a26bec8851c73e798a9652396">lightDir</a>;
<a name="l00063"></a>00063         visibility-&gt;<a class="code" href="structVisibilityTester.html#6333df874b073eea40c2f6ac3a61e640">SetRay</a>(p, *wi);
<a name="l00064"></a>00064         <span class="keywordflow">return</span> <a class="code" href="classDistantLight.html#272990a9abc46a4f5b708ecc17a6d5e7">L</a>;
<a name="l00065"></a>00065 }
<a name="l00066"></a><a class="code" href="classDistantLight.html#62072724ebfe89d8e9b871f69ebbfcb0">00066</a> <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classDistantLight.html#2592fdfeb6fb4c1fdabec6d089f3f2d5">DistantLight::Sample_L</a>(<span class="keyword">const</span> <a class="code" href="classPoint.html">Point</a> &amp;p, <span class="keywordtype">float</span> u1, <span class="keywordtype">float</span> u2,
<a name="l00067"></a>00067                 <a class="code" href="classVector.html">Vector</a> *wi, <span class="keywordtype">float</span> *pdf, <a class="code" href="structVisibilityTester.html">VisibilityTester</a> *visibility)<span class="keyword"> const </span>{
<a name="l00068"></a>00068         *pdf = 1.f;
<a name="l00069"></a>00069         <span class="keywordflow">return</span> <a class="code" href="classDistantLight.html#2592fdfeb6fb4c1fdabec6d089f3f2d5">Sample_L</a>(p, wi, visibility);
<a name="l00070"></a>00070 }
<a name="l00071"></a><a class="code" href="classDistantLight.html#d419fceba74a4e073b3eafad59d2d534">00071</a> <span class="keywordtype">float</span> <a class="code" href="classDistantLight.html#d419fceba74a4e073b3eafad59d2d534">DistantLight::Pdf</a>(<span class="keyword">const</span> <a class="code" href="classPoint.html">Point</a> &amp;, <span class="keyword">const</span> <a class="code" href="classVector.html">Vector</a> &amp;)<span class="keyword"> const </span>{
<a name="l00072"></a>00072         <span class="keywordflow">return</span> 0.;
<a name="l00073"></a>00073 }
<a name="l00074"></a><a class="code" href="classDistantLight.html#dced0735f3f4a5fc49a4ce95ca3e4f9a">00074</a> <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classDistantLight.html#2592fdfeb6fb4c1fdabec6d089f3f2d5">DistantLight::Sample_L</a>(<span class="keyword">const</span> <a class="code" href="classScene.html">Scene</a> *scene,
<a name="l00075"></a>00075                 <span class="keywordtype">float</span> u1, <span class="keywordtype">float</span> u2, <span class="keywordtype">float</span> u3, <span class="keywordtype">float</span> u4,
<a name="l00076"></a>00076                 <a class="code" href="classRay.html">Ray</a> *ray, <span class="keywordtype">float</span> *pdf)<span class="keyword"> const </span>{
<a name="l00077"></a>00077         <span class="comment">// Choose point on disk oriented toward infinite light direction</span>
<a name="l00078"></a>00078         <a class="code" href="classPoint.html">Point</a> worldCenter;
<a name="l00079"></a>00079         <span class="keywordtype">float</span> worldRadius;
<a name="l00080"></a>00080         scene-&gt;<a class="code" href="classScene.html#0637bcdecbdce44660b7694685846446">WorldBound</a>().<a class="code" href="classBBox.html#89ce0fcced6eee5eb2a40ba9a510b8cc">BoundingSphere</a>(&amp;worldCenter,
<a name="l00081"></a>00081                                            &amp;worldRadius);
<a name="l00082"></a>00082         <a class="code" href="classVector.html">Vector</a> v1, v2;
<a name="l00083"></a>00083         <a class="code" href="geometry_8h.html#031e7585a4def8a8496acb37db87adca">CoordinateSystem</a>(<a class="code" href="classDistantLight.html#3430bf3a26bec8851c73e798a9652396">lightDir</a>, &amp;v1, &amp;v2);
<a name="l00084"></a>00084         <span class="keywordtype">float</span> d1, d2;
<a name="l00085"></a>00085         <a class="code" href="mc_8cpp.html#95605832633c4524c81f2eb75c9e5cad">ConcentricSampleDisk</a>(u1, u2, &amp;d1, &amp;d2);
<a name="l00086"></a>00086         <a class="code" href="classPoint.html">Point</a> Pdisk =
<a name="l00087"></a>00087                 worldCenter + worldRadius * (d1 * v1 + d2 * v2);
<a name="l00088"></a>00088         <span class="comment">// Set ray origin and direction for infinite light ray</span>
<a name="l00089"></a>00089         ray-&gt;<a class="code" href="classRay.html#1014d000992e8ac3b92f150ad2a5cffe">o</a> = Pdisk + worldRadius * <a class="code" href="classDistantLight.html#3430bf3a26bec8851c73e798a9652396">lightDir</a>;
<a name="l00090"></a>00090         ray-&gt;<a class="code" href="classRay.html#5bbfc94e178e0a050b51200acc579069">d</a> = -lightDir;
<a name="l00091"></a>00091         *pdf = 1.f / (<a class="code" href="pbrt_8h.html#e71449b1cc6e6250b91f539153a7a0d3">M_PI</a> * worldRadius * worldRadius);
<a name="l00092"></a>00092         <span class="keywordflow">return</span> <a class="code" href="classDistantLight.html#272990a9abc46a4f5b708ecc17a6d5e7">L</a>;
<a name="l00093"></a>00093 }
<a name="l00094"></a><a class="code" href="distant_8cpp.html#490f507d1e9d24b745170dc3cff2fad2">00094</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="classLight.html">Light</a> *<a class="code" href="distant_8cpp.html#490f507d1e9d24b745170dc3cff2fad2">CreateLight</a>(<span class="keyword">const</span> <a class="code" href="classTransform.html">Transform</a> &amp;light2world,
<a name="l00095"></a>00095                 <span class="keyword">const</span> <a class="code" href="classParamSet.html">ParamSet</a> &amp;paramSet) {
<a name="l00096"></a>00096         <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classDistantLight.html#272990a9abc46a4f5b708ecc17a6d5e7">L</a> = paramSet.<a class="code" href="classParamSet.html#abe7a9db3a1aff8d7ec06408c34adc14">FindOneSpectrum</a>(<span class="stringliteral">"L"</span>, <a class="code" href="classSpectrum.html">Spectrum</a>(1.0));
<a name="l00097"></a>00097         <a class="code" href="classPoint.html">Point</a> from = paramSet.<a class="code" href="classParamSet.html#8a61fa4f03358648fae8b39dc7aba4c3">FindOnePoint</a>(<span class="stringliteral">"from"</span>, <a class="code" href="classPoint.html">Point</a>(0,0,0));
<a name="l00098"></a>00098         <a class="code" href="classPoint.html">Point</a> to = paramSet.<a class="code" href="classParamSet.html#8a61fa4f03358648fae8b39dc7aba4c3">FindOnePoint</a>(<span class="stringliteral">"to"</span>, <a class="code" href="classPoint.html">Point</a>(0,0,1));
<a name="l00099"></a>00099         <a class="code" href="classVector.html">Vector</a> dir = from-to;
<a name="l00100"></a>00100         <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="classDistantLight.html#800493ea65e6b5064015f91e025a7758">DistantLight</a>(light2world, L, dir);
<a name="l00101"></a>00101 }
</pre></div></div>
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