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<h1>homogeneous.cpp</h1><a href="homogeneous_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">// homogeneous.cpp*</span>
<a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="volume_8h.html">volume.h</a>"</span>
<a name="l00026"></a>00026 <span class="comment">// HomogeneousVolume Declarations</span>
<a name="l00027"></a><a class="code" href="classHomogeneousVolume.html">00027</a> <span class="keyword">class </span><a class="code" href="classHomogeneousVolume.html">HomogeneousVolume</a> : <span class="keyword">public</span> <a class="code" href="classVolumeRegion.html">VolumeRegion</a> {
<a name="l00028"></a>00028 <span class="keyword">public</span>:
<a name="l00029"></a>00029         <span class="comment">// HomogeneousVolume Public Methods</span>
<a name="l00030"></a><a class="code" href="classHomogeneousVolume.html#93e10cd70915ca758339e72214662cb8">00030</a>         <a class="code" href="classHomogeneousVolume.html#93e10cd70915ca758339e72214662cb8">HomogeneousVolume</a>(<span class="keyword">const</span> <a class="code" href="classSpectrum.html">Spectrum</a> &amp;sa, <span class="keyword">const</span> <a class="code" href="classSpectrum.html">Spectrum</a> &amp;ss, <span class="keywordtype">float</span> gg,
<a name="l00031"></a>00031                         <span class="keyword">const</span> <a class="code" href="classSpectrum.html">Spectrum</a> &amp;emit, <span class="keyword">const</span> <a class="code" href="classBBox.html">BBox</a> &amp;e,
<a name="l00032"></a>00032                         <span class="keyword">const</span> <a class="code" href="classTransform.html">Transform</a> &amp;v2w) {
<a name="l00033"></a>00033                 <a class="code" href="classHomogeneousVolume.html#a4d64d2abf821eccef9d69b3f217451b">WorldToVolume</a> = v2w.<a class="code" href="classTransform.html#ced6cc3fb16b20846fcee5aaf6432f49">GetInverse</a>();
<a name="l00034"></a>00034                 <a class="code" href="classHomogeneousVolume.html#6beed23249883a9fed17c14c5b046654">sig_a</a> = sa;
<a name="l00035"></a>00035                 <a class="code" href="classHomogeneousVolume.html#326b688e8bb7db1f9570eeefc6f34424">sig_s</a> = ss;
<a name="l00036"></a>00036                 <a class="code" href="classHomogeneousVolume.html#75451d0dff5bca202db60e1922dc10ce">g</a> = gg;
<a name="l00037"></a>00037                 <a class="code" href="classHomogeneousVolume.html#89555e3e0103bf598f87e442179879c6">le</a> = emit;
<a name="l00038"></a>00038                 <a class="code" href="classHomogeneousVolume.html#8c26b54fe48d17c833450355fb44987e">extent</a> = e;
<a name="l00039"></a>00039         }
<a name="l00040"></a><a class="code" href="classHomogeneousVolume.html#0e8eb56e3e26b9101ce5666e2f79173d">00040</a>         <a class="code" href="classBBox.html">BBox</a> <a class="code" href="classHomogeneousVolume.html#0e8eb56e3e26b9101ce5666e2f79173d">WorldBound</a>()<span class="keyword"> const </span>{
<a name="l00041"></a>00041                 <span class="keywordflow">return</span> <a class="code" href="classHomogeneousVolume.html#a4d64d2abf821eccef9d69b3f217451b">WorldToVolume</a>.<a class="code" href="classTransform.html#ced6cc3fb16b20846fcee5aaf6432f49">GetInverse</a>()(<a class="code" href="classHomogeneousVolume.html#8c26b54fe48d17c833450355fb44987e">extent</a>);
<a name="l00042"></a>00042         }
<a name="l00043"></a><a class="code" href="classHomogeneousVolume.html#1320ef12c2a646d51c76fd66a4aae85b">00043</a>         <span class="keywordtype">bool</span> <a class="code" href="classHomogeneousVolume.html#1320ef12c2a646d51c76fd66a4aae85b">IntersectP</a>(<span class="keyword">const</span> <a class="code" href="classRay.html">Ray</a> &amp;r, <span class="keywordtype">float</span> *t0, <span class="keywordtype">float</span> *t1)<span class="keyword"> const </span>{
<a name="l00044"></a>00044                 <a class="code" href="classRay.html">Ray</a> ray = <a class="code" href="classHomogeneousVolume.html#a4d64d2abf821eccef9d69b3f217451b">WorldToVolume</a>(r);
<a name="l00045"></a>00045                 <span class="keywordflow">return</span> <a class="code" href="classHomogeneousVolume.html#8c26b54fe48d17c833450355fb44987e">extent</a>.<a class="code" href="classBBox.html#4415e7f6ce6461eacdeebd7869a84066">IntersectP</a>(ray, t0, t1);
<a name="l00046"></a>00046         }
<a name="l00047"></a><a class="code" href="classHomogeneousVolume.html#dbfcc45200a1b301ded66f57243b553f">00047</a>         <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classHomogeneousVolume.html#dbfcc45200a1b301ded66f57243b553f">sigma_a</a>(<span class="keyword">const</span> <a class="code" href="classPoint.html">Point</a> &amp;<a class="code" href="classHomogeneousVolume.html#1319875df3cdf1021e357f5e32edd3cc">p</a>, <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="keywordflow">return</span> <a class="code" href="classHomogeneousVolume.html#8c26b54fe48d17c833450355fb44987e">extent</a>.<a class="code" href="classBBox.html#8b4dfd27f77b865f18ae052155614576">Inside</a>(<a class="code" href="classHomogeneousVolume.html#a4d64d2abf821eccef9d69b3f217451b">WorldToVolume</a>(p)) ? <a class="code" href="classHomogeneousVolume.html#6beed23249883a9fed17c14c5b046654">sig_a</a> : 0.;
<a name="l00049"></a>00049         }
<a name="l00050"></a><a class="code" href="classHomogeneousVolume.html#0ac106159012200366b7d2a63239de9f">00050</a>         <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classHomogeneousVolume.html#0ac106159012200366b7d2a63239de9f">sigma_s</a>(<span class="keyword">const</span> <a class="code" href="classPoint.html">Point</a> &amp;<a class="code" href="classHomogeneousVolume.html#1319875df3cdf1021e357f5e32edd3cc">p</a>, <span class="keyword">const</span> <a class="code" href="classVector.html">Vector</a> &amp;)<span class="keyword"> const </span>{
<a name="l00051"></a>00051                 <span class="keywordflow">return</span> <a class="code" href="classHomogeneousVolume.html#8c26b54fe48d17c833450355fb44987e">extent</a>.<a class="code" href="classBBox.html#8b4dfd27f77b865f18ae052155614576">Inside</a>(<a class="code" href="classHomogeneousVolume.html#a4d64d2abf821eccef9d69b3f217451b">WorldToVolume</a>(p)) ? <a class="code" href="classHomogeneousVolume.html#326b688e8bb7db1f9570eeefc6f34424">sig_s</a> : 0.;
<a name="l00052"></a>00052         }
<a name="l00053"></a><a class="code" href="classHomogeneousVolume.html#e744eb80f65873ccf5252f775f8d3d0f">00053</a>         <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classHomogeneousVolume.html#e744eb80f65873ccf5252f775f8d3d0f">sigma_t</a>(<span class="keyword">const</span> <a class="code" href="classPoint.html">Point</a> &amp;<a class="code" href="classHomogeneousVolume.html#1319875df3cdf1021e357f5e32edd3cc">p</a>, <span class="keyword">const</span> <a class="code" href="classVector.html">Vector</a> &amp;)<span class="keyword"> const </span>{
<a name="l00054"></a>00054                 <span class="keywordflow">return</span> <a class="code" href="classHomogeneousVolume.html#8c26b54fe48d17c833450355fb44987e">extent</a>.<a class="code" href="classBBox.html#8b4dfd27f77b865f18ae052155614576">Inside</a>(<a class="code" href="classHomogeneousVolume.html#a4d64d2abf821eccef9d69b3f217451b">WorldToVolume</a>(p)) ? (<a class="code" href="classHomogeneousVolume.html#6beed23249883a9fed17c14c5b046654">sig_a</a> + <a class="code" href="classHomogeneousVolume.html#326b688e8bb7db1f9570eeefc6f34424">sig_s</a>) : 0.;
<a name="l00055"></a>00055         }
<a name="l00056"></a><a class="code" href="classHomogeneousVolume.html#b68f9f246f37bdc90f7ac2153b372830">00056</a>         <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classHomogeneousVolume.html#b68f9f246f37bdc90f7ac2153b372830">Lve</a>(<span class="keyword">const</span> <a class="code" href="classPoint.html">Point</a> &amp;<a class="code" href="classHomogeneousVolume.html#1319875df3cdf1021e357f5e32edd3cc">p</a>, <span class="keyword">const</span> <a class="code" href="classVector.html">Vector</a> &amp;)<span class="keyword"> const </span>{
<a name="l00057"></a>00057                 <span class="keywordflow">return</span> <a class="code" href="classHomogeneousVolume.html#8c26b54fe48d17c833450355fb44987e">extent</a>.<a class="code" href="classBBox.html#8b4dfd27f77b865f18ae052155614576">Inside</a>(<a class="code" href="classHomogeneousVolume.html#a4d64d2abf821eccef9d69b3f217451b">WorldToVolume</a>(p)) ? <a class="code" href="classHomogeneousVolume.html#89555e3e0103bf598f87e442179879c6">le</a> : 0.;
<a name="l00058"></a>00058         }
<a name="l00059"></a><a class="code" href="classHomogeneousVolume.html#1319875df3cdf1021e357f5e32edd3cc">00059</a>         <span class="keywordtype">float</span> <a class="code" href="classHomogeneousVolume.html#1319875df3cdf1021e357f5e32edd3cc">p</a>(<span class="keyword">const</span> <a class="code" href="classPoint.html">Point</a> &amp;<a class="code" href="classHomogeneousVolume.html#1319875df3cdf1021e357f5e32edd3cc">p</a>, <span class="keyword">const</span> <a class="code" href="classVector.html">Vector</a> &amp;wi, <span class="keyword">const</span> <a class="code" href="classVector.html">Vector</a> &amp;wo)<span class="keyword"> const </span>{
<a name="l00060"></a>00060                 <span class="keywordflow">if</span> (!<a class="code" href="classHomogeneousVolume.html#8c26b54fe48d17c833450355fb44987e">extent</a>.<a class="code" href="classBBox.html#8b4dfd27f77b865f18ae052155614576">Inside</a>(<a class="code" href="classHomogeneousVolume.html#a4d64d2abf821eccef9d69b3f217451b">WorldToVolume</a>(p))) <span class="keywordflow">return</span> 0.;
<a name="l00061"></a>00061                 <span class="keywordflow">return</span> <a class="code" href="volume_8cpp.html#f11d691872b17277d633cf5d3a78abbd">PhaseHG</a>(wi, wo, <a class="code" href="classHomogeneousVolume.html#75451d0dff5bca202db60e1922dc10ce">g</a>);
<a name="l00062"></a>00062         }
<a name="l00063"></a><a class="code" href="classHomogeneousVolume.html#5bd7e5842169ef3e16e976754cd62fe9">00063</a>         <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classHomogeneousVolume.html#5bd7e5842169ef3e16e976754cd62fe9">Tau</a>(<span class="keyword">const</span> <a class="code" href="classRay.html">Ray</a> &amp;ray, <span class="keywordtype">float</span>, <span class="keywordtype">float</span>)<span class="keyword"> const </span>{
<a name="l00064"></a>00064                 <span class="keywordtype">float</span> t0, t1;
<a name="l00065"></a>00065                 <span class="keywordflow">if</span> (!<a class="code" href="classHomogeneousVolume.html#1320ef12c2a646d51c76fd66a4aae85b">IntersectP</a>(ray, &amp;t0, &amp;t1)) <span class="keywordflow">return</span> 0.;
<a name="l00066"></a>00066                 <span class="keywordflow">return</span> <a class="code" href="geometry_8h.html#b9355fa6841dbeaad166b9ea35cb9efc">Distance</a>(ray(t0), ray(t1)) * (<a class="code" href="classHomogeneousVolume.html#6beed23249883a9fed17c14c5b046654">sig_a</a> + <a class="code" href="classHomogeneousVolume.html#326b688e8bb7db1f9570eeefc6f34424">sig_s</a>);
<a name="l00067"></a>00067         }
<a name="l00068"></a>00068 <span class="keyword">private</span>:
<a name="l00069"></a>00069         <span class="comment">// HomogeneousVolume Private Data</span>
<a name="l00070"></a><a class="code" href="classHomogeneousVolume.html#326b688e8bb7db1f9570eeefc6f34424">00070</a>         <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classHomogeneousVolume.html#6beed23249883a9fed17c14c5b046654">sig_a</a>, <a class="code" href="classHomogeneousVolume.html#326b688e8bb7db1f9570eeefc6f34424">sig_s</a>, <a class="code" href="classHomogeneousVolume.html#89555e3e0103bf598f87e442179879c6">le</a>;
<a name="l00071"></a><a class="code" href="classHomogeneousVolume.html#75451d0dff5bca202db60e1922dc10ce">00071</a>         <span class="keywordtype">float</span> <a class="code" href="classHomogeneousVolume.html#75451d0dff5bca202db60e1922dc10ce">g</a>;
<a name="l00072"></a><a class="code" href="classHomogeneousVolume.html#8c26b54fe48d17c833450355fb44987e">00072</a>         <a class="code" href="classBBox.html">BBox</a> <a class="code" href="classHomogeneousVolume.html#8c26b54fe48d17c833450355fb44987e">extent</a>;
<a name="l00073"></a><a class="code" href="classHomogeneousVolume.html#a4d64d2abf821eccef9d69b3f217451b">00073</a>         <a class="code" href="classTransform.html">Transform</a> <a class="code" href="classHomogeneousVolume.html#a4d64d2abf821eccef9d69b3f217451b">WorldToVolume</a>;
<a name="l00074"></a>00074 };
<a name="l00075"></a>00075 <span class="comment">// HomogeneousVolume Method Definitions</span>
<a name="l00076"></a><a class="code" href="homogeneous_8cpp.html#2cc41487051ad087db8d39c7c88c53f0">00076</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="classVolumeRegion.html">VolumeRegion</a> *<a class="code" href="exponential_8cpp.html#2cc41487051ad087db8d39c7c88c53f0">CreateVolumeRegion</a>(<span class="keyword">const</span> <a class="code" href="classTransform.html">Transform</a> &amp;volume2world,
<a name="l00077"></a>00077                 <span class="keyword">const</span> <a class="code" href="classParamSet.html">ParamSet</a> &amp;params) {
<a name="l00078"></a>00078         <span class="comment">// Initialize common volume region parameters</span>
<a name="l00079"></a>00079         <a class="code" href="classSpectrum.html">Spectrum</a> sigma_a = params.<a class="code" href="classParamSet.html#abe7a9db3a1aff8d7ec06408c34adc14">FindOneSpectrum</a>(<span class="stringliteral">"sigma_a"</span>, 0.);
<a name="l00080"></a>00080         <a class="code" href="classSpectrum.html">Spectrum</a> sigma_s = params.<a class="code" href="classParamSet.html#abe7a9db3a1aff8d7ec06408c34adc14">FindOneSpectrum</a>(<span class="stringliteral">"sigma_s"</span>, 0.);
<a name="l00081"></a>00081         <span class="keywordtype">float</span> g = params.<a class="code" href="classParamSet.html#87143fd8e73a75082179a110d42531a4">FindOneFloat</a>(<span class="stringliteral">"g"</span>, 0.);
<a name="l00082"></a>00082         <a class="code" href="classSpectrum.html">Spectrum</a> Le = params.<a class="code" href="classParamSet.html#abe7a9db3a1aff8d7ec06408c34adc14">FindOneSpectrum</a>(<span class="stringliteral">"Le"</span>, 0.);
<a name="l00083"></a>00083         <a class="code" href="classPoint.html">Point</a> p0 = params.<a class="code" href="classParamSet.html#8a61fa4f03358648fae8b39dc7aba4c3">FindOnePoint</a>(<span class="stringliteral">"p0"</span>, <a class="code" href="classPoint.html">Point</a>(0,0,0));
<a name="l00084"></a>00084         <a class="code" href="classPoint.html">Point</a> p1 = params.<a class="code" href="classParamSet.html#8a61fa4f03358648fae8b39dc7aba4c3">FindOnePoint</a>(<span class="stringliteral">"p1"</span>, <a class="code" href="classPoint.html">Point</a>(1,1,1));
<a name="l00085"></a>00085         <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="classHomogeneousVolume.html">HomogeneousVolume</a>(sigma_a, sigma_s, g, Le, <a class="code" href="classBBox.html">BBox</a>(p0, p1),
<a name="l00086"></a>00086                 volume2world);
<a name="l00087"></a>00087 }
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