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<h1>exponential.cpp</h1><a href="exponential_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 <http://www.gnu.org/licenses/>.</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">// exponential.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">// ExponentialDensity Declarations</span>
<a name="l00027"></a><a class="code" href="classExponentialDensity.html">00027</a> <span class="keyword">class </span><a class="code" href="classExponentialDensity.html">ExponentialDensity</a> : <span class="keyword">public</span> <a class="code" href="classDensityRegion.html">DensityRegion</a> {
<a name="l00028"></a>00028 <span class="keyword">public</span>:
<a name="l00029"></a>00029 <span class="comment">// ExponentialDensity Public Methods</span>
<a name="l00030"></a><a class="code" href="classExponentialDensity.html#6f7d75c84e0af3d269b1f713be0838d9">00030</a> <a class="code" href="classExponentialDensity.html#6f7d75c84e0af3d269b1f713be0838d9">ExponentialDensity</a>(<span class="keyword">const</span> <a class="code" href="classSpectrum.html">Spectrum</a> &sa, <span class="keyword">const</span> <a class="code" href="classSpectrum.html">Spectrum</a> &ss,
<a name="l00031"></a>00031 <span class="keywordtype">float</span> gg, <span class="keyword">const</span> <a class="code" href="classSpectrum.html">Spectrum</a> &emit, <span class="keyword">const</span> <a class="code" href="classBBox.html">BBox</a> &e,
<a name="l00032"></a>00032 <span class="keyword">const</span> <a class="code" href="classTransform.html">Transform</a> &v2w, <span class="keywordtype">float</span> aa, <span class="keywordtype">float</span> bb,
<a name="l00033"></a>00033 <span class="keyword">const</span> <a class="code" href="classVector.html">Vector</a> &up)
<a name="l00034"></a>00034 : <a class="code" href="classDensityRegion.html">DensityRegion</a>(sa, ss, gg, emit, v2w),
<a name="l00035"></a>00035 <a class="code" href="classExponentialDensity.html#efbe6a430966061b032e4938a6197137">extent</a>(e), <a class="code" href="classExponentialDensity.html#0242c03318e71f0f11c67a2f3bbaf2b3">a</a>(aa), <a class="code" href="classExponentialDensity.html#1ba773d2460c2f4462a7e579f0bac945">b</a>(bb) {
<a name="l00036"></a>00036 <a class="code" href="classExponentialDensity.html#feaf43aa6160751e93768b9c08f28d76">upDir</a> = <a class="code" href="geometry_8h.html#46448bfa3df1c2de5e3b763f163866a4">Normalize</a>(up);
<a name="l00037"></a>00037 }
<a name="l00038"></a><a class="code" href="classExponentialDensity.html#c48ca191f418669c79e9378703c1cd88">00038</a> <a class="code" href="classBBox.html">BBox</a> <a class="code" href="classExponentialDensity.html#c48ca191f418669c79e9378703c1cd88">WorldBound</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classDensityRegion.html#16e6a32c16709e01167153eb9194802c">WorldToVolume</a>.<a class="code" href="classTransform.html#ced6cc3fb16b20846fcee5aaf6432f49">GetInverse</a>()(<a class="code" href="classExponentialDensity.html#efbe6a430966061b032e4938a6197137">extent</a>); }
<a name="l00039"></a><a class="code" href="classExponentialDensity.html#43a471d346c4dd7c16b1b893ef49c267">00039</a> <span class="keywordtype">bool</span> <a class="code" href="classExponentialDensity.html#43a471d346c4dd7c16b1b893ef49c267">IntersectP</a>(<span class="keyword">const</span> <a class="code" href="classRay.html">Ray</a> &r, <span class="keywordtype">float</span> *t0, <span class="keywordtype">float</span> *t1)<span class="keyword"> const </span>{
<a name="l00040"></a>00040 <a class="code" href="classRay.html">Ray</a> ray = <a class="code" href="classDensityRegion.html#16e6a32c16709e01167153eb9194802c">WorldToVolume</a>(r);
<a name="l00041"></a>00041 <span class="keywordflow">return</span> <a class="code" href="classExponentialDensity.html#efbe6a430966061b032e4938a6197137">extent</a>.<a class="code" href="classBBox.html#4415e7f6ce6461eacdeebd7869a84066">IntersectP</a>(ray, t0, t1);
<a name="l00042"></a>00042 }
<a name="l00043"></a><a class="code" href="classExponentialDensity.html#2ae063fd425bc8c129e08e08389f3779">00043</a> <span class="keywordtype">float</span> <a class="code" href="classExponentialDensity.html#2ae063fd425bc8c129e08e08389f3779">Density</a>(<span class="keyword">const</span> <a class="code" href="classPoint.html">Point</a> &Pobj)<span class="keyword"> const </span>{
<a name="l00044"></a>00044 <span class="keywordflow">if</span> (!<a class="code" href="classExponentialDensity.html#efbe6a430966061b032e4938a6197137">extent</a>.<a class="code" href="classBBox.html#8b4dfd27f77b865f18ae052155614576">Inside</a>(Pobj)) <span class="keywordflow">return</span> 0;
<a name="l00045"></a>00045 <span class="keywordtype">float</span> height = <a class="code" href="geometry_8h.html#ad0d36688d190693f70a5c9ef9342914">Dot</a>(Pobj - <a class="code" href="classExponentialDensity.html#efbe6a430966061b032e4938a6197137">extent</a>.<a class="code" href="classBBox.html#6efc252ac04a7236369d0ebdc11dab4c">pMin</a>, <a class="code" href="classExponentialDensity.html#feaf43aa6160751e93768b9c08f28d76">upDir</a>);
<a name="l00046"></a>00046 <span class="keywordflow">return</span> <a class="code" href="classExponentialDensity.html#0242c03318e71f0f11c67a2f3bbaf2b3">a</a> * expf(-<a class="code" href="classExponentialDensity.html#1ba773d2460c2f4462a7e579f0bac945">b</a> * height);
<a name="l00047"></a>00047 }
<a name="l00048"></a>00048 <span class="keyword">private</span>:
<a name="l00049"></a>00049 <span class="comment">// ExponentialDensity Private Data</span>
<a name="l00050"></a><a class="code" href="classExponentialDensity.html#efbe6a430966061b032e4938a6197137">00050</a> <a class="code" href="classBBox.html">BBox</a> <a class="code" href="classExponentialDensity.html#efbe6a430966061b032e4938a6197137">extent</a>;
<a name="l00051"></a><a class="code" href="classExponentialDensity.html#1ba773d2460c2f4462a7e579f0bac945">00051</a> <span class="keywordtype">float</span> <a class="code" href="classExponentialDensity.html#0242c03318e71f0f11c67a2f3bbaf2b3">a</a>, <a class="code" href="classExponentialDensity.html#1ba773d2460c2f4462a7e579f0bac945">b</a>;
<a name="l00052"></a><a class="code" href="classExponentialDensity.html#feaf43aa6160751e93768b9c08f28d76">00052</a> <a class="code" href="classVector.html">Vector</a> <a class="code" href="classExponentialDensity.html#feaf43aa6160751e93768b9c08f28d76">upDir</a>;
<a name="l00053"></a>00053 };
<a name="l00054"></a>00054 <span class="comment">// ExponentialDensity Method Definitions</span>
<a name="l00055"></a><a class="code" href="exponential_8cpp.html#2cc41487051ad087db8d39c7c88c53f0">00055</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> &volume2world,
<a name="l00056"></a>00056 <span class="keyword">const</span> <a class="code" href="classParamSet.html">ParamSet</a> &params) {
<a name="l00057"></a>00057 <span class="comment">// Initialize common volume region parameters</span>
<a name="l00058"></a>00058 <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="l00059"></a>00059 <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="l00060"></a>00060 <span class="keywordtype">float</span> g = params.<a class="code" href="classParamSet.html#87143fd8e73a75082179a110d42531a4">FindOneFloat</a>(<span class="stringliteral">"g"</span>, 0.);
<a name="l00061"></a>00061 <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="l00062"></a>00062 <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="l00063"></a>00063 <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="l00064"></a>00064 <span class="keywordtype">float</span> a = params.<a class="code" href="classParamSet.html#87143fd8e73a75082179a110d42531a4">FindOneFloat</a>(<span class="stringliteral">"a"</span>, 1.);
<a name="l00065"></a>00065 <span class="keywordtype">float</span> b = params.<a class="code" href="classParamSet.html#87143fd8e73a75082179a110d42531a4">FindOneFloat</a>(<span class="stringliteral">"b"</span>, 1.);
<a name="l00066"></a>00066 <a class="code" href="classVector.html">Vector</a> up = params.<a class="code" href="classParamSet.html#ed75f5f8f40b12f89a3f3bacd68be147">FindOneVector</a>(<span class="stringliteral">"updir"</span>, <a class="code" href="classVector.html">Vector</a>(0,1,0));
<a name="l00067"></a>00067 <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="classExponentialDensity.html">ExponentialDensity</a>(sigma_a, sigma_s, g, Le, <a class="code" href="classBBox.html">BBox</a>(p0, p1),
<a name="l00068"></a>00068 volume2world, a, b, up);
<a name="l00069"></a>00069 }
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