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<h1>dox/VolumeRendering/vtkUnstructuredGridPartialPreIntegration.h</h1><a href="a03629.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*=========================================================================</span>
<a name="l00002"></a>00002 <span class="comment"></span>
<a name="l00003"></a>00003 <span class="comment"> Program: Visualization Toolkit</span>
<a name="l00004"></a>00004 <span class="comment"> Module: $RCSfile: vtkUnstructuredGridPartialPreIntegration.h,v $</span>
<a name="l00005"></a>00005 <span class="comment"></span>
<a name="l00006"></a>00006 <span class="comment"> Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen</span>
<a name="l00007"></a>00007 <span class="comment"> All rights reserved.</span>
<a name="l00008"></a>00008 <span class="comment"> See Copyright.txt or http://www.kitware.com/Copyright.htm for details.</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment"> This software is distributed WITHOUT ANY WARRANTY; without even</span>
<a name="l00011"></a>00011 <span class="comment"> the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR</span>
<a name="l00012"></a>00012 <span class="comment"> PURPOSE. See the above copyright notice for more information.</span>
<a name="l00013"></a>00013 <span class="comment"></span>
<a name="l00014"></a>00014 <span class="comment">=========================================================================*/</span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="comment">/*</span>
<a name="l00017"></a>00017 <span class="comment"> * Copyright 2004 Sandia Corporation.</span>
<a name="l00018"></a>00018 <span class="comment"> * Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive</span>
<a name="l00019"></a>00019 <span class="comment"> * license for use of this work by or on behalf of the</span>
<a name="l00020"></a>00020 <span class="comment"> * U.S. Government. Redistribution and use in source and binary forms, with</span>
<a name="l00021"></a>00021 <span class="comment"> * or without modification, are permitted provided that this Notice and any</span>
<a name="l00022"></a>00022 <span class="comment"> * statement of authorship are reproduced on all copies.</span>
<a name="l00023"></a>00023 <span class="comment"> */</span>
<a name="l00024"></a>00024
<a name="l00044"></a>00044 <span class="preprocessor">#ifndef __vtkUnstructuredGridPartialPreIntegration_h</span>
<a name="l00045"></a>00045 <span class="preprocessor"></span><span class="preprocessor">#define __vtkUnstructuredGridPartialPreIntegration_h</span>
<a name="l00046"></a>00046 <span class="preprocessor"></span>
<a name="l00047"></a>00047 <span class="preprocessor">#include "<a class="code" href="a03635.html">vtkUnstructuredGridVolumeRayIntegrator.h</a>"</span>
<a name="l00048"></a>00048 <span class="preprocessor">#include "<a class="code" href="a02073.html">vtkMath.h</a>"</span> <span class="comment">// For all the inline methods</span>
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="keyword">class </span>vtkPartialPreIntegrationTransferFunction;
<a name="l00051"></a>00051 <span class="keyword">class </span><a class="code" href="a01844.html" title="represents the common properties for rendering a volume.">vtkVolumeProperty</a>;
<a name="l00052"></a>00052
<a name="l00053"></a><a class="code" href="a01797.html">00053</a> <span class="keyword">class </span><a class="code" href="a02170.html#4c512a1c00e5052ca1bbef09929dba95">VTK_VOLUMERENDERING_EXPORT</a> <a class="code" href="a01797.html" title="performs piecewise linear ray integration.">vtkUnstructuredGridPartialPreIntegration</a> : <span class="keyword">public</span> <a class="code" href="a01807.html" title="a superclass for volume ray integration functions">vtkUnstructuredGridVolumeRayIntegrator</a>
<a name="l00054"></a>00054 {
<a name="l00055"></a>00055 <span class="keyword">public</span>:
<a name="l00056"></a>00056 vtkTypeRevisionMacro(<a class="code" href="a01797.html" title="performs piecewise linear ray integration.">vtkUnstructuredGridPartialPreIntegration</a>,
<a name="l00057"></a><a class="code" href="a01797.html#b4b926adbbb06af3b51e2721e5c868ec">00057</a> <a class="code" href="a01807.html" title="a superclass for volume ray integration functions">vtkUnstructuredGridVolumeRayIntegrator</a>);
<a name="l00058"></a>00058 <span class="keyword">static</span> <a class="code" href="a01797.html" title="performs piecewise linear ray integration.">vtkUnstructuredGridPartialPreIntegration</a> *<a class="code" href="a01084.html#4d5b227267c076d6f9e38483370b6612">New</a>();
<a name="l00059"></a>00059 <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="a01807.html#c1f0c958c64ef2d20c3950fa70eba003">PrintSelf</a>(ostream &os, <a class="code" href="a00869.html" title="a simple class to control print indentation">vtkIndent</a> indent);
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="a01807.html#1bf6fd3d88e2dcb7710f28b3d5de405d">Initialize</a>(<a class="code" href="a01839.html" title="represents a volume (data &amp; properties) in a rendered scene">vtkVolume</a> *volume, <a class="code" href="a00356.html" title="abstract superclass for arrays of numeric data">vtkDataArray</a> *scalars);
<a name="l00062"></a>00062
<a name="l00063"></a>00063 <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="a01807.html#a0ddf237a4541d9e21389b5e6cb26d2d">Integrate</a>(<a class="code" href="a00436.html" title="dynamic, self-adjusting array of double">vtkDoubleArray</a> *intersectionLengths,
<a name="l00064"></a>00064 <a class="code" href="a00356.html" title="abstract superclass for arrays of numeric data">vtkDataArray</a> *nearIntersections,
<a name="l00065"></a>00065 <a class="code" href="a00356.html" title="abstract superclass for arrays of numeric data">vtkDataArray</a> *farIntersections,
<a name="l00066"></a>00066 <span class="keywordtype">float</span> <a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d210ab06a058f9ffb559855ff8495aa7e53e">color</a>[4]);
<a name="l00067"></a>00067
<a name="l00069"></a>00069
<a name="l00071"></a>00071 <span class="keyword">static</span> <span class="keywordtype">void</span> IntegrateRay(<span class="keywordtype">double</span> <a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d21042c5d76c3275f5d17bc1b329d83ab003">length</a>,
<a name="l00072"></a>00072 <span class="keywordtype">double</span> intensity_front, <span class="keywordtype">double</span> attenuation_front,
<a name="l00073"></a>00073 <span class="keywordtype">double</span> intensity_back, <span class="keywordtype">double</span> attenuation_back,
<a name="l00074"></a>00074 <span class="keywordtype">float</span> <a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d210ab06a058f9ffb559855ff8495aa7e53e">color</a>[4]);
<a name="l00075"></a>00075 <span class="keyword">static</span> <span class="keywordtype">void</span> IntegrateRay(<span class="keywordtype">double</span> <a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d21042c5d76c3275f5d17bc1b329d83ab003">length</a>,
<a name="l00076"></a>00076 <span class="keyword">const</span> <span class="keywordtype">double</span> color_front[3],
<a name="l00077"></a>00077 <span class="keywordtype">double</span> attenuation_front,
<a name="l00078"></a>00078 <span class="keyword">const</span> <span class="keywordtype">double</span> color_back[3],
<a name="l00079"></a>00079 <span class="keywordtype">double</span> attenuation_back,
<a name="l00080"></a>00080 <span class="keywordtype">float</span> <a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d210ab06a058f9ffb559855ff8495aa7e53e">color</a>[4]);
<a name="l00082"></a>00082
<a name="l00084"></a>00084
<a name="l00088"></a>00088 <span class="keyword">static</span> <span class="keywordtype">float</span> Psi(<span class="keywordtype">float</span> taufD, <span class="keywordtype">float</span> taubD);
<a name="l00089"></a>00089 <span class="keyword">static</span> <span class="keywordtype">float</span> *GetPsiTable(<span class="keywordtype">int</span> &<a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d210e3d5e7c015dff08d8daf72a0102e1444">size</a>);
<a name="l00090"></a>00090 <span class="keyword">static</span> <span class="keywordtype">void</span> BuildPsiTable();
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="keyword">protected</span>:
<a name="l00094"></a>00094 <a class="code" href="a01797.html" title="performs piecewise linear ray integration.">vtkUnstructuredGridPartialPreIntegration</a>();
<a name="l00095"></a>00095 ~<a class="code" href="a01797.html" title="performs piecewise linear ray integration.">vtkUnstructuredGridPartialPreIntegration</a>();
<a name="l00096"></a>00096
<a name="l00097"></a><a class="code" href="a01797.html#57158864bc912e1f41aafce145fd7e5d">00097</a> <a class="code" href="a01844.html" title="represents the common properties for rendering a volume.">vtkVolumeProperty</a> *Property;
<a name="l00098"></a>00098
<a name="l00099"></a><a class="code" href="a01797.html#46faa346576d60a9fbeea411c406cbb5">00099</a> vtkPartialPreIntegrationTransferFunction *TransferFunctions;
<a name="l00100"></a><a class="code" href="a01797.html#7911e8f9d7db455e6ddbb66fc2b6d068">00100</a> <a class="code" href="a01719.html" title="record modification and/or execution time">vtkTimeStamp</a> TransferFunctionsModified;
<a name="l00101"></a><a class="code" href="a01797.html#c90fb3cdfad496192c50bac918448eb1">00101</a> <span class="keywordtype">int</span> NumIndependentComponents;
<a name="l00102"></a>00102
<a name="l00103"></a>00103 <span class="comment">//BTX</span>
<a name="l00104"></a><a class="code" href="a01797.html#f6dbea834d26a59aba0bfe8e467a5d013a77330e38d6dda2baf4a8165b0e580b">00104</a> <span class="keyword">enum</span> {PSI_TABLE_SIZE = 512};
<a name="l00105"></a>00105 <span class="comment">//ETX</span>
<a name="l00106"></a><a class="code" href="a01797.html#cb7d8c0a66dc17d4db0868a3cc2e6474">00106</a> <span class="keyword">static</span> <span class="keywordtype">float</span> PsiTable[PSI_TABLE_SIZE*PSI_TABLE_SIZE];
<a name="l00107"></a><a class="code" href="a01797.html#8d083672f99f721efd82eb50fab5ed5a">00107</a> <span class="keyword">static</span> <span class="keywordtype">int</span> PsiTableBuilt;
<a name="l00108"></a>00108
<a name="l00109"></a>00109 <span class="keyword">private</span>:
<a name="l00110"></a>00110 <a class="code" href="a01797.html" title="performs piecewise linear ray integration.">vtkUnstructuredGridPartialPreIntegration</a>(<span class="keyword">const</span> <a class="code" href="a01797.html" title="performs piecewise linear ray integration.">vtkUnstructuredGridPartialPreIntegration</a>&); <span class="comment">// Not implemented.</span>
<a name="l00111"></a>00111 <span class="keywordtype">void</span> operator=(<span class="keyword">const</span> <a class="code" href="a01797.html" title="performs piecewise linear ray integration.">vtkUnstructuredGridPartialPreIntegration</a>&); <span class="comment">// Not implemented.</span>
<a name="l00112"></a>00112 };
<a name="l00113"></a>00113
<a name="l00114"></a><a class="code" href="a01797.html#b39cd26c57fe3f2d471074610777ca94">00114</a> <span class="keyword">inline</span> <span class="keywordtype">float</span> <a class="code" href="a01797.html#b39cd26c57fe3f2d471074610777ca94">vtkUnstructuredGridPartialPreIntegration::Psi</a>(<span class="keywordtype">float</span> taufD,
<a name="l00115"></a>00115 <span class="keywordtype">float</span> taubD)
<a name="l00116"></a>00116 {
<a name="l00117"></a>00117 <span class="keywordtype">float</span> gammaf = taufD/(taufD+1);
<a name="l00118"></a>00118 <span class="keywordtype">float</span> gammab = taubD/(taubD+1);
<a name="l00119"></a>00119 <span class="keywordtype">int</span> gammafi = <a class="code" href="a00996.html#a32a872d29227bb04a59fd60b0a96076">vtkMath::Floor</a>(gammaf*<a class="code" href="a01797.html#f6dbea834d26a59aba0bfe8e467a5d013a77330e38d6dda2baf4a8165b0e580b">PSI_TABLE_SIZE</a>);
<a name="l00120"></a>00120 <span class="keywordtype">int</span> gammabi = <a class="code" href="a00996.html#a32a872d29227bb04a59fd60b0a96076">vtkMath::Floor</a>(gammab*PSI_TABLE_SIZE);
<a name="l00121"></a>00121 <span class="keywordflow">return</span> <a class="code" href="a01797.html#cb7d8c0a66dc17d4db0868a3cc2e6474">PsiTable</a>[gammafi*PSI_TABLE_SIZE + gammabi];
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123
<a name="l00124"></a><a class="code" href="a01797.html#a863f3344df8d7d3e85fffe383a20a5d">00124</a> <span class="keyword">inline</span> <span class="keywordtype">float</span> *<a class="code" href="a01797.html#a863f3344df8d7d3e85fffe383a20a5d">vtkUnstructuredGridPartialPreIntegration::GetPsiTable</a>(<span class="keywordtype">int</span> &<a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d210e3d5e7c015dff08d8daf72a0102e1444">size</a>)
<a name="l00125"></a>00125 {
<a name="l00126"></a>00126 size = <a class="code" href="a01797.html#f6dbea834d26a59aba0bfe8e467a5d013a77330e38d6dda2baf4a8165b0e580b">PSI_TABLE_SIZE</a>;
<a name="l00127"></a>00127 <span class="keywordflow">return</span> <a class="code" href="a01797.html#cb7d8c0a66dc17d4db0868a3cc2e6474">PsiTable</a>;
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129
<a name="l00130"></a><a class="code" href="a01797.html#7654fe4bd0503a5c6dddc9627439a59c">00130</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="a01797.html#7654fe4bd0503a5c6dddc9627439a59c">vtkUnstructuredGridPartialPreIntegration::IntegrateRay</a>(
<a name="l00131"></a>00131 <span class="keywordtype">double</span> <a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d21042c5d76c3275f5d17bc1b329d83ab003">length</a>,
<a name="l00132"></a>00132 <span class="keywordtype">double</span> intensity_front,
<a name="l00133"></a>00133 <span class="keywordtype">double</span> attenuation_front,
<a name="l00134"></a>00134 <span class="keywordtype">double</span> intensity_back,
<a name="l00135"></a>00135 <span class="keywordtype">double</span> attenuation_back,
<a name="l00136"></a>00136 <span class="keywordtype">float</span> <a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d210ab06a058f9ffb559855ff8495aa7e53e">color</a>[4])
<a name="l00137"></a>00137 {
<a name="l00138"></a>00138 <span class="keywordtype">float</span> taufD = length*attenuation_front;
<a name="l00139"></a>00139 <span class="keywordtype">float</span> taubD = length*attenuation_back;
<a name="l00140"></a>00140 <span class="keywordtype">float</span> <a class="code" href="a01797.html#b39cd26c57fe3f2d471074610777ca94">Psi</a> = <a class="code" href="a01797.html#b39cd26c57fe3f2d471074610777ca94">vtkUnstructuredGridPartialPreIntegration::Psi</a>(taufD, taubD);
<a name="l00141"></a>00141 <span class="keywordtype">float</span> zeta = <span class="keyword">static_cast<</span><span class="keywordtype">float</span><span class="keyword">></span>(exp(-0.5*(taufD+taubD)));
<a name="l00142"></a>00142 <span class="keywordtype">float</span> <a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d210a6028180e112c2c1c3556a8253cdbff5">alpha</a> = 1-zeta;
<a name="l00143"></a>00143
<a name="l00144"></a>00144 <span class="keywordtype">float</span> newintensity = (1-color[3])*( intensity_front*(1-Psi)
<a name="l00145"></a>00145 + intensity_back*(Psi-zeta) );
<a name="l00146"></a>00146 <span class="comment">// Is setting the RGB values the same the right thing to do?</span>
<a name="l00147"></a>00147 color[0] += newintensity;
<a name="l00148"></a>00148 color[1] += newintensity;
<a name="l00149"></a>00149 color[2] += newintensity;
<a name="l00150"></a>00150 color[3] += (1-color[3])*alpha;
<a name="l00151"></a>00151 }
<a name="l00152"></a>00152
<a name="l00153"></a><a class="code" href="a01797.html#73c3ad38cfff498d83d2097e3287c3d5">00153</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="a01797.html#7654fe4bd0503a5c6dddc9627439a59c">vtkUnstructuredGridPartialPreIntegration::IntegrateRay</a>(
<a name="l00154"></a>00154 <span class="keywordtype">double</span> <a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d21042c5d76c3275f5d17bc1b329d83ab003">length</a>,
<a name="l00155"></a>00155 <span class="keyword">const</span> <span class="keywordtype">double</span> color_front[3],
<a name="l00156"></a>00156 <span class="keywordtype">double</span> attenuation_front,
<a name="l00157"></a>00157 <span class="keyword">const</span> <span class="keywordtype">double</span> color_back[3],
<a name="l00158"></a>00158 <span class="keywordtype">double</span> attenuation_back,
<a name="l00159"></a>00159 <span class="keywordtype">float</span> <a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d210ab06a058f9ffb559855ff8495aa7e53e">color</a>[4])
<a name="l00160"></a>00160 {
<a name="l00161"></a>00161 <span class="keywordtype">float</span> taufD = length*attenuation_front;
<a name="l00162"></a>00162 <span class="keywordtype">float</span> taubD = length*attenuation_back;
<a name="l00163"></a>00163 <span class="keywordtype">float</span> <a class="code" href="a01797.html#b39cd26c57fe3f2d471074610777ca94">Psi</a> = <a class="code" href="a01797.html#b39cd26c57fe3f2d471074610777ca94">vtkUnstructuredGridPartialPreIntegration::Psi</a>(taufD, taubD);
<a name="l00164"></a>00164 <span class="keywordtype">float</span> zeta = <span class="keyword">static_cast<</span><span class="keywordtype">float</span><span class="keyword">></span>(exp(-0.5*(taufD+taubD)));
<a name="l00165"></a>00165 <span class="keywordtype">float</span> <a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d210a6028180e112c2c1c3556a8253cdbff5">alpha</a> = 1-zeta;
<a name="l00166"></a>00166
<a name="l00167"></a>00167 color[0] += (1-color[3])*(color_front[0]*(1-Psi) + color_back[0]*(Psi-zeta));
<a name="l00168"></a>00168 color[1] += (1-color[3])*(color_front[1]*(1-Psi) + color_back[1]*(Psi-zeta));
<a name="l00169"></a>00169 color[2] += (1-color[3])*(color_front[2]*(1-Psi) + color_back[2]*(Psi-zeta));
<a name="l00170"></a>00170 color[3] += (1-color[3])*alpha;
<a name="l00171"></a>00171 }
<a name="l00172"></a>00172
<a name="l00173"></a>00173 <span class="preprocessor">#endif //__vtkUnstructuredGridPartialPreIntegration_h</span>
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