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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>pbrt: cylinder.cpp Source File</title>
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<h1>cylinder.cpp</h1><a href="cylinder_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">// cylinder.cpp*</span>
<a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="shape_8h.html">shape.h</a>"</span>
<a name="l00026"></a>00026 <span class="comment">// Cylinder Declarations</span>
<a name="l00027"></a><a class="code" href="classCylinder.html">00027</a> <span class="keyword">class </span><a class="code" href="classCylinder.html">Cylinder</a>: <span class="keyword">public</span> <a class="code" href="classShape.html">Shape</a> {
<a name="l00028"></a>00028 <span class="keyword">public</span>:
<a name="l00029"></a>00029 <span class="comment">// Cylinder Public Methods</span>
<a name="l00030"></a>00030 <a class="code" href="classCylinder.html#3f8602862c6811ac16cd9fa37e3ac7fd">Cylinder</a>(<span class="keyword">const</span> <a class="code" href="classTransform.html">Transform</a> &o2w, <span class="keywordtype">bool</span> ro, <span class="keywordtype">float</span> rad,
<a name="l00031"></a>00031 <span class="keywordtype">float</span> <a class="code" href="classCylinder.html#fd3c40a02876b8701c65559b7b237ad6">zmin</a>, <span class="keywordtype">float</span> <a class="code" href="classCylinder.html#5af56f6de3c76da8e58733277e55aa3c">zmax</a>, <span class="keywordtype">float</span> <a class="code" href="classCylinder.html#a3942fe9b276463a7e65b7ff74bdb448">phiMax</a>);
<a name="l00032"></a>00032 <a class="code" href="classBBox.html">BBox</a> <a class="code" href="classCylinder.html#ad876342c5c037119708d46b6b89766f">ObjectBound</a>() <span class="keyword">const</span>;
<a name="l00033"></a>00033 <span class="keywordtype">bool</span> <a class="code" href="classCylinder.html#0f10668c891f10330e6995056fbd656c">Intersect</a>(<span class="keyword">const</span> <a class="code" href="classRay.html">Ray</a> &ray, <span class="keywordtype">float</span> *tHit,
<a name="l00034"></a>00034 <a class="code" href="structDifferentialGeometry.html">DifferentialGeometry</a> *dg) <span class="keyword">const</span>;
<a name="l00035"></a>00035 <span class="keywordtype">bool</span> <a class="code" href="classCylinder.html#ecfa72682735fec14662d5196b5df1de">IntersectP</a>(<span class="keyword">const</span> <a class="code" href="classRay.html">Ray</a> &ray) <span class="keyword">const</span>;
<a name="l00036"></a>00036 <span class="keywordtype">float</span> <a class="code" href="classCylinder.html#d3b80b55e4d493a04fe66ccf7818be78">Area</a>() <span class="keyword">const</span>;
<a name="l00037"></a><a class="code" href="classCylinder.html#b7ea72992e636dbcecca5c06c30f32af">00037</a> <a class="code" href="classPoint.html">Point</a> <a class="code" href="classCylinder.html#b7ea72992e636dbcecca5c06c30f32af">Sample</a>(<span class="keywordtype">float</span> u1, <span class="keywordtype">float</span> u2,
<a name="l00038"></a>00038 <a class="code" href="classNormal.html">Normal</a> *Ns)<span class="keyword"> const </span>{
<a name="l00039"></a>00039 <span class="keywordtype">float</span> z = <a class="code" href="pbrt_8h.html#0934d1ba879ec4edf23b9c3bc4e52b35">Lerp</a>(u1, zmin, zmax);
<a name="l00040"></a>00040 <span class="keywordtype">float</span> t = u2 * phiMax;
<a name="l00041"></a>00041 <a class="code" href="classPoint.html">Point</a> p = <a class="code" href="classPoint.html">Point</a>(<a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">radius</a> * cosf(t), <a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">radius</a> * sinf(t), z);
<a name="l00042"></a>00042 *Ns = <a class="code" href="geometry_8h.html#46448bfa3df1c2de5e3b763f163866a4">Normalize</a>(<a class="code" href="classShape.html#7c8a34f400c3a5ad7cfd2395836cda03">ObjectToWorld</a>(<a class="code" href="classNormal.html">Normal</a>(p.<a class="code" href="classPoint.html#05dfe2dfbde813ad234b514f30e662f1">x</a>, p.<a class="code" href="classPoint.html#6101960c8d2d4e8ea1d32c9234bbeb8d">y</a>, 0.)));
<a name="l00043"></a>00043 <span class="keywordflow">if</span> (<a class="code" href="classShape.html#337c63db30f17a31ac81a8921ec97872">reverseOrientation</a>) *Ns *= -1.f;
<a name="l00044"></a>00044 <span class="keywordflow">return</span> <a class="code" href="classShape.html#7c8a34f400c3a5ad7cfd2395836cda03">ObjectToWorld</a>(p);
<a name="l00045"></a>00045 }
<a name="l00046"></a>00046 <span class="keyword">protected</span>:
<a name="l00047"></a>00047 <span class="comment">// Cylinder Private Data</span>
<a name="l00048"></a><a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">00048</a> <span class="keywordtype">float</span> <a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">radius</a>;
<a name="l00049"></a><a class="code" href="classCylinder.html#fd3c40a02876b8701c65559b7b237ad6">00049</a> <span class="keywordtype">float</span> zmin, zmax;
<a name="l00050"></a><a class="code" href="classCylinder.html#a3942fe9b276463a7e65b7ff74bdb448">00050</a> <span class="keywordtype">float</span> phiMax;
<a name="l00051"></a>00051 };
<a name="l00052"></a>00052 <span class="comment">// Cylinder Method Definitions</span>
<a name="l00053"></a><a class="code" href="classCylinder.html#3f8602862c6811ac16cd9fa37e3ac7fd">00053</a> <a class="code" href="classCylinder.html#3f8602862c6811ac16cd9fa37e3ac7fd">Cylinder::Cylinder</a>(<span class="keyword">const</span> <a class="code" href="classTransform.html">Transform</a> &o2w, <span class="keywordtype">bool</span> ro, <span class="keywordtype">float</span> rad,
<a name="l00054"></a>00054 <span class="keywordtype">float</span> z0, <span class="keywordtype">float</span> z1, <span class="keywordtype">float</span> pm)
<a name="l00055"></a>00055 : <a class="code" href="classShape.html">Shape</a>(o2w, ro) {
<a name="l00056"></a>00056 <a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">radius</a> = rad;
<a name="l00057"></a>00057 <a class="code" href="classCylinder.html#fd3c40a02876b8701c65559b7b237ad6">zmin</a> = min(z0, z1);
<a name="l00058"></a>00058 <a class="code" href="classCylinder.html#5af56f6de3c76da8e58733277e55aa3c">zmax</a> = max(z0, z1);
<a name="l00059"></a>00059 <a class="code" href="classCylinder.html#a3942fe9b276463a7e65b7ff74bdb448">phiMax</a> = <a class="code" href="pbrt_8h.html#12544670622d3fbc783e1cb4d56b3a23">Radians</a>(<a class="code" href="pbrt_8h.html#036098e5cec04b73d8720de12e8e5cd1">Clamp</a>(pm, 0.0f, 360.0f));
<a name="l00060"></a>00060 }
<a name="l00061"></a><a class="code" href="classCylinder.html#ad876342c5c037119708d46b6b89766f">00061</a> <a class="code" href="classBBox.html">BBox</a> <a class="code" href="classCylinder.html#ad876342c5c037119708d46b6b89766f">Cylinder::ObjectBound</a>()<span class="keyword"> const </span>{
<a name="l00062"></a>00062 <a class="code" href="classPoint.html">Point</a> p1 = <a class="code" href="classPoint.html">Point</a>(-<a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">radius</a>, -<a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">radius</a>, <a class="code" href="classCylinder.html#fd3c40a02876b8701c65559b7b237ad6">zmin</a>);
<a name="l00063"></a>00063 <a class="code" href="classPoint.html">Point</a> p2 = <a class="code" href="classPoint.html">Point</a>( <a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">radius</a>, <a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">radius</a>, <a class="code" href="classCylinder.html#5af56f6de3c76da8e58733277e55aa3c">zmax</a>);
<a name="l00064"></a>00064 <span class="keywordflow">return</span> <a class="code" href="classBBox.html">BBox</a>(p1, p2);
<a name="l00065"></a>00065 }
<a name="l00066"></a><a class="code" href="classCylinder.html#0f10668c891f10330e6995056fbd656c">00066</a> <span class="keywordtype">bool</span> <a class="code" href="classCylinder.html#0f10668c891f10330e6995056fbd656c">Cylinder::Intersect</a>(<span class="keyword">const</span> <a class="code" href="classRay.html">Ray</a> &r, <span class="keywordtype">float</span> *tHit,
<a name="l00067"></a>00067 <a class="code" href="structDifferentialGeometry.html">DifferentialGeometry</a> *dg)<span class="keyword"> const </span>{
<a name="l00068"></a>00068 <span class="keywordtype">float</span> phi;
<a name="l00069"></a>00069 <a class="code" href="classPoint.html">Point</a> phit;
<a name="l00070"></a>00070 <span class="comment">// Transform _Ray_ to object space</span>
<a name="l00071"></a>00071 <a class="code" href="classRay.html">Ray</a> ray;
<a name="l00072"></a>00072 <a class="code" href="classShape.html#72cf45b4c359fc22b3264a02e932324e">WorldToObject</a>(r, &ray);
<a name="l00073"></a>00073 <span class="comment">// Compute quadratic cylinder coefficients</span>
<a name="l00074"></a>00074 <span class="keywordtype">float</span> A = ray.<a class="code" href="classRay.html#5bbfc94e178e0a050b51200acc579069">d</a>.<a class="code" href="classVector.html#ca49165049a1e21ae47afcfc078819ed">x</a>*ray.<a class="code" href="classRay.html#5bbfc94e178e0a050b51200acc579069">d</a>.<a class="code" href="classVector.html#ca49165049a1e21ae47afcfc078819ed">x</a> + ray.<a class="code" href="classRay.html#5bbfc94e178e0a050b51200acc579069">d</a>.<a class="code" href="classVector.html#81be9102fca6d9beea3efef522c4c09d">y</a>*ray.<a class="code" href="classRay.html#5bbfc94e178e0a050b51200acc579069">d</a>.<a class="code" href="classVector.html#81be9102fca6d9beea3efef522c4c09d">y</a>;
<a name="l00075"></a>00075 <span class="keywordtype">float</span> B = 2 * (ray.<a class="code" href="classRay.html#5bbfc94e178e0a050b51200acc579069">d</a>.<a class="code" href="classVector.html#ca49165049a1e21ae47afcfc078819ed">x</a>*ray.<a class="code" href="classRay.html#1014d000992e8ac3b92f150ad2a5cffe">o</a>.<a class="code" href="classPoint.html#05dfe2dfbde813ad234b514f30e662f1">x</a> + ray.<a class="code" href="classRay.html#5bbfc94e178e0a050b51200acc579069">d</a>.<a class="code" href="classVector.html#81be9102fca6d9beea3efef522c4c09d">y</a>*ray.<a class="code" href="classRay.html#1014d000992e8ac3b92f150ad2a5cffe">o</a>.<a class="code" href="classPoint.html#6101960c8d2d4e8ea1d32c9234bbeb8d">y</a>);
<a name="l00076"></a>00076 <span class="keywordtype">float</span> C = ray.<a class="code" href="classRay.html#1014d000992e8ac3b92f150ad2a5cffe">o</a>.<a class="code" href="classPoint.html#05dfe2dfbde813ad234b514f30e662f1">x</a>*ray.<a class="code" href="classRay.html#1014d000992e8ac3b92f150ad2a5cffe">o</a>.<a class="code" href="classPoint.html#05dfe2dfbde813ad234b514f30e662f1">x</a> + ray.<a class="code" href="classRay.html#1014d000992e8ac3b92f150ad2a5cffe">o</a>.<a class="code" href="classPoint.html#6101960c8d2d4e8ea1d32c9234bbeb8d">y</a>*ray.<a class="code" href="classRay.html#1014d000992e8ac3b92f150ad2a5cffe">o</a>.<a class="code" href="classPoint.html#6101960c8d2d4e8ea1d32c9234bbeb8d">y</a> - <a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">radius</a>*<a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">radius</a>;
<a name="l00077"></a>00077 <span class="comment">// Solve quadratic equation for _t_ values</span>
<a name="l00078"></a>00078 <span class="keywordtype">float</span> t0, t1;
<a name="l00079"></a>00079 <span class="keywordflow">if</span> (!<a class="code" href="pbrt_8h.html#14bbcf80fc40915df82a84e6eb2dfb3b">Quadratic</a>(A, B, C, &t0, &t1))
<a name="l00080"></a>00080 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00081"></a>00081 <span class="comment">// Compute intersection distance along ray</span>
<a name="l00082"></a>00082 <span class="keywordflow">if</span> (t0 > ray.<a class="code" href="classRay.html#aa6c29ceae8edc5c9d37e879daa1557a">maxt</a> || t1 < ray.<a class="code" href="classRay.html#ded3b6e00c215611ebd61a6965560ba0">mint</a>)
<a name="l00083"></a>00083 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00084"></a>00084 <span class="keywordtype">float</span> thit = t0;
<a name="l00085"></a>00085 <span class="keywordflow">if</span> (t0 < ray.<a class="code" href="classRay.html#ded3b6e00c215611ebd61a6965560ba0">mint</a>) {
<a name="l00086"></a>00086 thit = t1;
<a name="l00087"></a>00087 <span class="keywordflow">if</span> (thit > ray.<a class="code" href="classRay.html#aa6c29ceae8edc5c9d37e879daa1557a">maxt</a>) <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00088"></a>00088 }
<a name="l00089"></a>00089 <span class="comment">// Compute cylinder hit point and $\phi$</span>
<a name="l00090"></a>00090 phit = ray(thit);
<a name="l00091"></a>00091 phi = atan2f(phit.<a class="code" href="classPoint.html#6101960c8d2d4e8ea1d32c9234bbeb8d">y</a>, phit.<a class="code" href="classPoint.html#05dfe2dfbde813ad234b514f30e662f1">x</a>);
<a name="l00092"></a>00092 <span class="keywordflow">if</span> (phi < 0.) phi += 2.f*<a class="code" href="pbrt_8h.html#e71449b1cc6e6250b91f539153a7a0d3">M_PI</a>;
<a name="l00093"></a>00093 <span class="comment">// Test cylinder intersection against clipping parameters</span>
<a name="l00094"></a>00094 <span class="keywordflow">if</span> (phit.<a class="code" href="classPoint.html#9a666531e0e99adff132be93d2407d0c">z</a> < <a class="code" href="classCylinder.html#fd3c40a02876b8701c65559b7b237ad6">zmin</a> || phit.<a class="code" href="classPoint.html#9a666531e0e99adff132be93d2407d0c">z</a> > <a class="code" href="classCylinder.html#5af56f6de3c76da8e58733277e55aa3c">zmax</a> || phi > <a class="code" href="classCylinder.html#a3942fe9b276463a7e65b7ff74bdb448">phiMax</a>) {
<a name="l00095"></a>00095 <span class="keywordflow">if</span> (thit == t1) <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00096"></a>00096 thit = t1;
<a name="l00097"></a>00097 <span class="keywordflow">if</span> (t1 > ray.<a class="code" href="classRay.html#aa6c29ceae8edc5c9d37e879daa1557a">maxt</a>) <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00098"></a>00098 <span class="comment">// Compute cylinder hit point and $\phi$</span>
<a name="l00099"></a>00099 phit = ray(thit);
<a name="l00100"></a>00100 phi = atan2f(phit.<a class="code" href="classPoint.html#6101960c8d2d4e8ea1d32c9234bbeb8d">y</a>, phit.<a class="code" href="classPoint.html#05dfe2dfbde813ad234b514f30e662f1">x</a>);
<a name="l00101"></a>00101 <span class="keywordflow">if</span> (phi < 0.) phi += 2.f*<a class="code" href="pbrt_8h.html#e71449b1cc6e6250b91f539153a7a0d3">M_PI</a>;
<a name="l00102"></a>00102 <span class="keywordflow">if</span> (phit.<a class="code" href="classPoint.html#9a666531e0e99adff132be93d2407d0c">z</a> < <a class="code" href="classCylinder.html#fd3c40a02876b8701c65559b7b237ad6">zmin</a> || phit.<a class="code" href="classPoint.html#9a666531e0e99adff132be93d2407d0c">z</a> > <a class="code" href="classCylinder.html#5af56f6de3c76da8e58733277e55aa3c">zmax</a> || phi > <a class="code" href="classCylinder.html#a3942fe9b276463a7e65b7ff74bdb448">phiMax</a>)
<a name="l00103"></a>00103 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00104"></a>00104 }
<a name="l00105"></a>00105 <span class="comment">// Find parametric representation of cylinder hit</span>
<a name="l00106"></a>00106 <span class="keywordtype">float</span> u = phi / <a class="code" href="classCylinder.html#a3942fe9b276463a7e65b7ff74bdb448">phiMax</a>;
<a name="l00107"></a>00107 <span class="keywordtype">float</span> v = (phit.<a class="code" href="classPoint.html#9a666531e0e99adff132be93d2407d0c">z</a> - <a class="code" href="classCylinder.html#fd3c40a02876b8701c65559b7b237ad6">zmin</a>) / (<a class="code" href="classCylinder.html#5af56f6de3c76da8e58733277e55aa3c">zmax</a> - <a class="code" href="classCylinder.html#fd3c40a02876b8701c65559b7b237ad6">zmin</a>);
<a name="l00108"></a>00108 <span class="comment">// Compute cylinder \dpdu and \dpdv</span>
<a name="l00109"></a>00109 <a class="code" href="classVector.html">Vector</a> dpdu(-<a class="code" href="classCylinder.html#a3942fe9b276463a7e65b7ff74bdb448">phiMax</a> * phit.<a class="code" href="classPoint.html#6101960c8d2d4e8ea1d32c9234bbeb8d">y</a>, <a class="code" href="classCylinder.html#a3942fe9b276463a7e65b7ff74bdb448">phiMax</a> * phit.<a class="code" href="classPoint.html#05dfe2dfbde813ad234b514f30e662f1">x</a>, 0);
<a name="l00110"></a>00110 <a class="code" href="classVector.html">Vector</a> dpdv(0, 0, <a class="code" href="classCylinder.html#5af56f6de3c76da8e58733277e55aa3c">zmax</a> - <a class="code" href="classCylinder.html#fd3c40a02876b8701c65559b7b237ad6">zmin</a>);
<a name="l00111"></a>00111 <span class="comment">// Compute cylinder \dndu and \dndv</span>
<a name="l00112"></a>00112 <a class="code" href="classVector.html">Vector</a> d2Pduu = -<a class="code" href="classCylinder.html#a3942fe9b276463a7e65b7ff74bdb448">phiMax</a> * <a class="code" href="classCylinder.html#a3942fe9b276463a7e65b7ff74bdb448">phiMax</a> *
<a name="l00113"></a>00113 <a class="code" href="classVector.html">Vector</a>(phit.<a class="code" href="classPoint.html#05dfe2dfbde813ad234b514f30e662f1">x</a>, phit.<a class="code" href="classPoint.html#6101960c8d2d4e8ea1d32c9234bbeb8d">y</a>, 0);
<a name="l00114"></a>00114 Vector d2Pduv(0, 0, 0), d2Pdvv(0, 0, 0);
<a name="l00115"></a>00115 <span class="comment">// Compute coefficients for fundamental forms</span>
<a name="l00116"></a>00116 <span class="keywordtype">float</span> E = <a class="code" href="geometry_8h.html#ad0d36688d190693f70a5c9ef9342914">Dot</a>(dpdu, dpdu);
<a name="l00117"></a>00117 <span class="keywordtype">float</span> F = <a class="code" href="geometry_8h.html#ad0d36688d190693f70a5c9ef9342914">Dot</a>(dpdu, dpdv);
<a name="l00118"></a>00118 <span class="keywordtype">float</span> G = <a class="code" href="geometry_8h.html#ad0d36688d190693f70a5c9ef9342914">Dot</a>(dpdv, dpdv);
<a name="l00119"></a>00119 Vector <a class="code" href="util_8cpp.html#0240ac851181b84ac374872dc5434ee4">N</a> = <a class="code" href="geometry_8h.html#46448bfa3df1c2de5e3b763f163866a4">Normalize</a>(<a class="code" href="geometry_8h.html#340d6d877ba46443c9ad20e7c0d0668f">Cross</a>(dpdu, dpdv));
<a name="l00120"></a>00120 <span class="keywordtype">float</span> e = <a class="code" href="geometry_8h.html#ad0d36688d190693f70a5c9ef9342914">Dot</a>(N, d2Pduu);
<a name="l00121"></a>00121 <span class="keywordtype">float</span> f = <a class="code" href="geometry_8h.html#ad0d36688d190693f70a5c9ef9342914">Dot</a>(N, d2Pduv);
<a name="l00122"></a>00122 <span class="keywordtype">float</span> g = <a class="code" href="geometry_8h.html#ad0d36688d190693f70a5c9ef9342914">Dot</a>(N, d2Pdvv);
<a name="l00123"></a>00123 <span class="comment">// Compute \dndu and \dndv from fundamental form coefficients</span>
<a name="l00124"></a>00124 <span class="keywordtype">float</span> invEGF2 = 1.f / (E*G - F*F);
<a name="l00125"></a>00125 Vector dndu = (f*F - e*G) * invEGF2 * dpdu +
<a name="l00126"></a>00126 (e*F - f*E) * invEGF2 * dpdv;
<a name="l00127"></a>00127 Vector dndv = (g*F - f*G) * invEGF2 * dpdu +
<a name="l00128"></a>00128 (f*F - g*E) * invEGF2 * dpdv;
<a name="l00129"></a>00129 <span class="comment">// Initialize _DifferentialGeometry_ from parametric information</span>
<a name="l00130"></a>00130 *dg = <a class="code" href="structDifferentialGeometry.html">DifferentialGeometry</a>(<a class="code" href="classShape.html#7c8a34f400c3a5ad7cfd2395836cda03">ObjectToWorld</a>(phit),
<a name="l00131"></a>00131 <a class="code" href="classShape.html#7c8a34f400c3a5ad7cfd2395836cda03">ObjectToWorld</a>(dpdu),
<a name="l00132"></a>00132 <a class="code" href="classShape.html#7c8a34f400c3a5ad7cfd2395836cda03">ObjectToWorld</a>(dpdv),
<a name="l00133"></a>00133 <a class="code" href="classShape.html#7c8a34f400c3a5ad7cfd2395836cda03">ObjectToWorld</a>(dndu),
<a name="l00134"></a>00134 <a class="code" href="classShape.html#7c8a34f400c3a5ad7cfd2395836cda03">ObjectToWorld</a>(dndv),
<a name="l00135"></a>00135 u, v, <span class="keyword">this</span>);
<a name="l00136"></a>00136 <span class="comment">// Update _tHit_ for quadric intersection</span>
<a name="l00137"></a>00137 *tHit = thit;
<a name="l00138"></a>00138 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00139"></a>00139 }
<a name="l00140"></a><a class="code" href="classCylinder.html#ecfa72682735fec14662d5196b5df1de">00140</a> <span class="keywordtype">bool</span> <a class="code" href="classCylinder.html#ecfa72682735fec14662d5196b5df1de">Cylinder::IntersectP</a>(<span class="keyword">const</span> <a class="code" href="classRay.html">Ray</a> &r)<span class="keyword"> const </span>{
<a name="l00141"></a>00141 <span class="keywordtype">float</span> phi;
<a name="l00142"></a>00142 <a class="code" href="classPoint.html">Point</a> phit;
<a name="l00143"></a>00143 <span class="comment">// Transform _Ray_ to object space</span>
<a name="l00144"></a>00144 <a class="code" href="classRay.html">Ray</a> ray;
<a name="l00145"></a>00145 <a class="code" href="classShape.html#72cf45b4c359fc22b3264a02e932324e">WorldToObject</a>(r, &ray);
<a name="l00146"></a>00146 <span class="comment">// Compute quadratic cylinder coefficients</span>
<a name="l00147"></a>00147 <span class="keywordtype">float</span> A = ray.<a class="code" href="classRay.html#5bbfc94e178e0a050b51200acc579069">d</a>.<a class="code" href="classVector.html#ca49165049a1e21ae47afcfc078819ed">x</a>*ray.<a class="code" href="classRay.html#5bbfc94e178e0a050b51200acc579069">d</a>.<a class="code" href="classVector.html#ca49165049a1e21ae47afcfc078819ed">x</a> + ray.<a class="code" href="classRay.html#5bbfc94e178e0a050b51200acc579069">d</a>.<a class="code" href="classVector.html#81be9102fca6d9beea3efef522c4c09d">y</a>*ray.<a class="code" href="classRay.html#5bbfc94e178e0a050b51200acc579069">d</a>.<a class="code" href="classVector.html#81be9102fca6d9beea3efef522c4c09d">y</a>;
<a name="l00148"></a>00148 <span class="keywordtype">float</span> B = 2 * (ray.<a class="code" href="classRay.html#5bbfc94e178e0a050b51200acc579069">d</a>.<a class="code" href="classVector.html#ca49165049a1e21ae47afcfc078819ed">x</a>*ray.<a class="code" href="classRay.html#1014d000992e8ac3b92f150ad2a5cffe">o</a>.<a class="code" href="classPoint.html#05dfe2dfbde813ad234b514f30e662f1">x</a> + ray.<a class="code" href="classRay.html#5bbfc94e178e0a050b51200acc579069">d</a>.<a class="code" href="classVector.html#81be9102fca6d9beea3efef522c4c09d">y</a>*ray.<a class="code" href="classRay.html#1014d000992e8ac3b92f150ad2a5cffe">o</a>.<a class="code" href="classPoint.html#6101960c8d2d4e8ea1d32c9234bbeb8d">y</a>);
<a name="l00149"></a>00149 <span class="keywordtype">float</span> C = ray.<a class="code" href="classRay.html#1014d000992e8ac3b92f150ad2a5cffe">o</a>.<a class="code" href="classPoint.html#05dfe2dfbde813ad234b514f30e662f1">x</a>*ray.<a class="code" href="classRay.html#1014d000992e8ac3b92f150ad2a5cffe">o</a>.<a class="code" href="classPoint.html#05dfe2dfbde813ad234b514f30e662f1">x</a> + ray.<a class="code" href="classRay.html#1014d000992e8ac3b92f150ad2a5cffe">o</a>.<a class="code" href="classPoint.html#6101960c8d2d4e8ea1d32c9234bbeb8d">y</a>*ray.<a class="code" href="classRay.html#1014d000992e8ac3b92f150ad2a5cffe">o</a>.<a class="code" href="classPoint.html#6101960c8d2d4e8ea1d32c9234bbeb8d">y</a> - <a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">radius</a>*<a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">radius</a>;
<a name="l00150"></a>00150 <span class="comment">// Solve quadratic equation for _t_ values</span>
<a name="l00151"></a>00151 <span class="keywordtype">float</span> t0, t1;
<a name="l00152"></a>00152 <span class="keywordflow">if</span> (!<a class="code" href="pbrt_8h.html#14bbcf80fc40915df82a84e6eb2dfb3b">Quadratic</a>(A, B, C, &t0, &t1))
<a name="l00153"></a>00153 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00154"></a>00154 <span class="comment">// Compute intersection distance along ray</span>
<a name="l00155"></a>00155 <span class="keywordflow">if</span> (t0 > ray.<a class="code" href="classRay.html#aa6c29ceae8edc5c9d37e879daa1557a">maxt</a> || t1 < ray.<a class="code" href="classRay.html#ded3b6e00c215611ebd61a6965560ba0">mint</a>)
<a name="l00156"></a>00156 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00157"></a>00157 <span class="keywordtype">float</span> thit = t0;
<a name="l00158"></a>00158 <span class="keywordflow">if</span> (t0 < ray.<a class="code" href="classRay.html#ded3b6e00c215611ebd61a6965560ba0">mint</a>) {
<a name="l00159"></a>00159 thit = t1;
<a name="l00160"></a>00160 <span class="keywordflow">if</span> (thit > ray.<a class="code" href="classRay.html#aa6c29ceae8edc5c9d37e879daa1557a">maxt</a>) <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00161"></a>00161 }
<a name="l00162"></a>00162 <span class="comment">// Compute cylinder hit point and $\phi$</span>
<a name="l00163"></a>00163 phit = ray(thit);
<a name="l00164"></a>00164 phi = atan2f(phit.<a class="code" href="classPoint.html#6101960c8d2d4e8ea1d32c9234bbeb8d">y</a>, phit.<a class="code" href="classPoint.html#05dfe2dfbde813ad234b514f30e662f1">x</a>);
<a name="l00165"></a>00165 <span class="keywordflow">if</span> (phi < 0.) phi += 2.f*<a class="code" href="pbrt_8h.html#e71449b1cc6e6250b91f539153a7a0d3">M_PI</a>;
<a name="l00166"></a>00166 <span class="comment">// Test cylinder intersection against clipping parameters</span>
<a name="l00167"></a>00167 <span class="keywordflow">if</span> (phit.<a class="code" href="classPoint.html#9a666531e0e99adff132be93d2407d0c">z</a> < <a class="code" href="classCylinder.html#fd3c40a02876b8701c65559b7b237ad6">zmin</a> || phit.<a class="code" href="classPoint.html#9a666531e0e99adff132be93d2407d0c">z</a> > <a class="code" href="classCylinder.html#5af56f6de3c76da8e58733277e55aa3c">zmax</a> || phi > <a class="code" href="classCylinder.html#a3942fe9b276463a7e65b7ff74bdb448">phiMax</a>) {
<a name="l00168"></a>00168 <span class="keywordflow">if</span> (thit == t1) <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00169"></a>00169 thit = t1;
<a name="l00170"></a>00170 <span class="keywordflow">if</span> (t1 > ray.<a class="code" href="classRay.html#aa6c29ceae8edc5c9d37e879daa1557a">maxt</a>) <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00171"></a>00171 <span class="comment">// Compute cylinder hit point and $\phi$</span>
<a name="l00172"></a>00172 phit = ray(thit);
<a name="l00173"></a>00173 phi = atan2f(phit.<a class="code" href="classPoint.html#6101960c8d2d4e8ea1d32c9234bbeb8d">y</a>, phit.<a class="code" href="classPoint.html#05dfe2dfbde813ad234b514f30e662f1">x</a>);
<a name="l00174"></a>00174 <span class="keywordflow">if</span> (phi < 0.) phi += 2.f*<a class="code" href="pbrt_8h.html#e71449b1cc6e6250b91f539153a7a0d3">M_PI</a>;
<a name="l00175"></a>00175 <span class="keywordflow">if</span> (phit.<a class="code" href="classPoint.html#9a666531e0e99adff132be93d2407d0c">z</a> < <a class="code" href="classCylinder.html#fd3c40a02876b8701c65559b7b237ad6">zmin</a> || phit.<a class="code" href="classPoint.html#9a666531e0e99adff132be93d2407d0c">z</a> > <a class="code" href="classCylinder.html#5af56f6de3c76da8e58733277e55aa3c">zmax</a> || phi > <a class="code" href="classCylinder.html#a3942fe9b276463a7e65b7ff74bdb448">phiMax</a>)
<a name="l00176"></a>00176 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00177"></a>00177 }
<a name="l00178"></a>00178 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00179"></a>00179 }
<a name="l00180"></a><a class="code" href="classCylinder.html#d3b80b55e4d493a04fe66ccf7818be78">00180</a> <span class="keywordtype">float</span> <a class="code" href="classCylinder.html#d3b80b55e4d493a04fe66ccf7818be78">Cylinder::Area</a>()<span class="keyword"> const </span>{
<a name="l00181"></a>00181 <span class="keywordflow">return</span> (<a class="code" href="classCylinder.html#5af56f6de3c76da8e58733277e55aa3c">zmax</a>-<a class="code" href="classCylinder.html#fd3c40a02876b8701c65559b7b237ad6">zmin</a>)*<a class="code" href="classCylinder.html#a3942fe9b276463a7e65b7ff74bdb448">phiMax</a>*<a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">radius</a>;
<a name="l00182"></a>00182 }
<a name="l00183"></a><a class="code" href="cylinder_8cpp.html#3ca5abc6928b2220103b7f077e0471e1">00183</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="classShape.html">Shape</a> *<a class="code" href="cone_8cpp.html#3ca5abc6928b2220103b7f077e0471e1">CreateShape</a>(<span class="keyword">const</span> <a class="code" href="classTransform.html">Transform</a> &o2w, <span class="keywordtype">bool</span> <a class="code" href="classShape.html#337c63db30f17a31ac81a8921ec97872">reverseOrientation</a>,
<a name="l00184"></a>00184 <span class="keyword">const</span> <a class="code" href="classParamSet.html">ParamSet</a> &params) {
<a name="l00185"></a>00185 <span class="keywordtype">float</span> <a class="code" href="classCylinder.html#1583f3bf381f6e293666fea468a3cd2a">radius</a> = params.<a class="code" href="classParamSet.html#87143fd8e73a75082179a110d42531a4">FindOneFloat</a>( <span class="stringliteral">"radius"</span>, 1 );
<a name="l00186"></a>00186 <span class="keywordtype">float</span> <a class="code" href="classCylinder.html#fd3c40a02876b8701c65559b7b237ad6">zmin</a> = params.<a class="code" href="classParamSet.html#87143fd8e73a75082179a110d42531a4">FindOneFloat</a>( <span class="stringliteral">"zmin"</span>, -1 );
<a name="l00187"></a>00187 <span class="keywordtype">float</span> <a class="code" href="classCylinder.html#5af56f6de3c76da8e58733277e55aa3c">zmax</a> = params.<a class="code" href="classParamSet.html#87143fd8e73a75082179a110d42531a4">FindOneFloat</a>( <span class="stringliteral">"zmax"</span>, 1 );
<a name="l00188"></a>00188 <span class="keywordtype">float</span> phimax = params.<a class="code" href="classParamSet.html#87143fd8e73a75082179a110d42531a4">FindOneFloat</a>( <span class="stringliteral">"phimax"</span>, 360 );
<a name="l00189"></a>00189 <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="classCylinder.html#3f8602862c6811ac16cd9fa37e3ac7fd">Cylinder</a>(o2w, reverseOrientation, radius, zmin, zmax, phimax);
<a name="l00190"></a>00190 }
</pre></div></div>
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