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<hr><h1>aabbox.cpp</h1><a href="aabbox_cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 
00007 <font class="comment">/* Copyright, 2000 Nevrax Ltd.
</font>00008 <font class="comment"> *
</font>00009 <font class="comment"> * This file is part of NEVRAX NEL.
</font>00010 <font class="comment"> * NEVRAX NEL is free software; you can redistribute it and/or modify
</font>00011 <font class="comment"> * it under the terms of the GNU General Public License as published by
</font>00012 <font class="comment"> * the Free Software Foundation; either version 2, or (at your option)
</font>00013 <font class="comment"> * any later version.
</font>00014 <font class="comment">
</font>00015 <font class="comment"> * NEVRAX NEL is distributed in the hope that it will be useful, but
</font>00016 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of
</font>00017 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
</font>00018 <font class="comment"> * General Public License for more details.
</font>00019 <font class="comment">
</font>00020 <font class="comment"> * You should have received a copy of the GNU General Public License
</font>00021 <font class="comment"> * along with NEVRAX NEL; see the file COPYING. If not, write to the
</font>00022 <font class="comment"> * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
</font>00023 <font class="comment"> * MA 02111-1307, USA.
</font>00024 <font class="comment"> */</font>
00025 
00026 <font class="preprocessor">#include "<a class="code" href="aabbox_h.html">nel/3d/aabbox.h</a>"</font>
00027 <font class="preprocessor">#include "<a class="code" href="polygon_h.html">nel/3d/polygon.h</a>"</font>
00028 
00029 
00030 <font class="keyword">namespace</font> NL3D {
00031 
00032 
00033 <font class="comment">// ***************************************************************************</font>
<a name="l00034"></a><a class="code" href="class_NL3D__CAABBox.html#a12">00034</a> <font class="keywordtype">bool</font>    CAABBox::clipFront(<font class="keyword">const</font> CPlane &amp;p)<font class="keyword"> const
</font>00035 <font class="keyword"></font>{
00036         CVector         hswap;
00037 
00038         <font class="comment">// The bbox is front of the plane if only one of his vertex is in front.</font>
00039         <font class="keywordflow">if</font>(p*(Center + HalfSize) &gt; 0)   <font class="keywordflow">return</font> <font class="keyword">true</font>;
00040         <font class="keywordflow">if</font>(p*(Center - HalfSize) &gt; 0)   <font class="keywordflow">return</font> <font class="keyword">true</font>;
00041         hswap.set(-HalfSize.x, HalfSize.y, HalfSize.z);
00042         <font class="keywordflow">if</font>(p*(Center + hswap) &gt; 0)      <font class="keywordflow">return</font> <font class="keyword">true</font>;
00043         <font class="keywordflow">if</font>(p*(Center - hswap) &gt; 0)      <font class="keywordflow">return</font> <font class="keyword">true</font>;
00044         hswap.set(HalfSize.x, -HalfSize.y, HalfSize.z);
00045         <font class="keywordflow">if</font>(p*(Center + hswap) &gt; 0)      <font class="keywordflow">return</font> <font class="keyword">true</font>;
00046         <font class="keywordflow">if</font>(p*(Center - hswap) &gt; 0)      <font class="keywordflow">return</font> <font class="keyword">true</font>;
00047         hswap.set(HalfSize.x, HalfSize.y, -HalfSize.z);
00048         <font class="keywordflow">if</font>(p*(Center + hswap) &gt; 0)      <font class="keywordflow">return</font> <font class="keyword">true</font>;
00049         <font class="keywordflow">if</font>(p*(Center - hswap) &gt; 0)      <font class="keywordflow">return</font> <font class="keyword">true</font>;
00050 
00051         <font class="keywordflow">return</font> <font class="keyword">false</font>;
00052 }
00053 <font class="comment">// ***************************************************************************</font>
<a name="l00054"></a><a class="code" href="class_NL3D__CAABBox.html#a13">00054</a> <font class="keywordtype">bool</font>    CAABBox::clipBack(<font class="keyword">const</font> CPlane &amp;p)<font class="keyword"> const
</font>00055 <font class="keyword"></font>{
00056         CVector         hswap;
00057 
00058         <font class="comment">// The bbox is back of the plane if only one of his vertex is in back.</font>
00059         <font class="keywordflow">if</font>(p*(Center + HalfSize) &lt; 0)   <font class="keywordflow">return</font> <font class="keyword">true</font>;
00060         <font class="keywordflow">if</font>(p*(Center - HalfSize) &lt; 0)   <font class="keywordflow">return</font> <font class="keyword">true</font>;
00061         hswap.set(-HalfSize.x, HalfSize.y, HalfSize.z);
00062         <font class="keywordflow">if</font>(p*(Center + hswap) &lt; 0)      <font class="keywordflow">return</font> <font class="keyword">true</font>;
00063         <font class="keywordflow">if</font>(p*(Center - hswap) &lt; 0)      <font class="keywordflow">return</font> <font class="keyword">true</font>;
00064         hswap.set(HalfSize.x, -HalfSize.y, HalfSize.z);
00065         <font class="keywordflow">if</font>(p*(Center + hswap) &lt; 0)      <font class="keywordflow">return</font> <font class="keyword">true</font>;
00066         <font class="keywordflow">if</font>(p*(Center - hswap) &lt; 0)      <font class="keywordflow">return</font> <font class="keyword">true</font>;
00067         hswap.set(HalfSize.x, HalfSize.y, -HalfSize.z);
00068         <font class="keywordflow">if</font>(p*(Center + hswap) &lt; 0)      <font class="keywordflow">return</font> <font class="keyword">true</font>;
00069         <font class="keywordflow">if</font>(p*(Center - hswap) &lt; 0)      <font class="keywordflow">return</font> <font class="keyword">true</font>;
00070 
00071         <font class="keywordflow">return</font> <font class="keyword">false</font>;
00072 }
00073 
00074 
00075 <font class="comment">// ***************************************************************************</font>
<a name="l00076"></a><a class="code" href="class_NL3D__CAABBox.html#a14">00076</a> <font class="keywordtype">bool</font>                    CAABBox::include(<font class="keyword">const</font> CVector &amp;a)<font class="keyword"> const
</font>00077 <font class="keyword"></font>{
00078         <font class="keywordflow">if</font>(Center.x+HalfSize.x&lt;a.x)     <font class="keywordflow">return</font> <font class="keyword">false</font>;
00079         <font class="keywordflow">if</font>(Center.x-HalfSize.x&gt;a.x)     <font class="keywordflow">return</font> <font class="keyword">false</font>;
00080         <font class="keywordflow">if</font>(Center.y+HalfSize.y&lt;a.y)     <font class="keywordflow">return</font> <font class="keyword">false</font>;
00081         <font class="keywordflow">if</font>(Center.y-HalfSize.y&gt;a.y)     <font class="keywordflow">return</font> <font class="keyword">false</font>;
00082         <font class="keywordflow">if</font>(Center.z+HalfSize.z&lt;a.z)     <font class="keywordflow">return</font> <font class="keyword">false</font>;
00083         <font class="keywordflow">if</font>(Center.z-HalfSize.z&gt;a.z)     <font class="keywordflow">return</font> <font class="keyword">false</font>;
00084         <font class="keywordflow">return</font> <font class="keyword">true</font>;
00085 }
00086 
00087 
00088 <font class="comment">// ***************************************************************************</font>
<a name="l00089"></a><a class="code" href="class_NL3D__CAABBox.html#a15">00089</a> <font class="keywordtype">bool</font>                    CAABBox::intersect(<font class="keyword">const</font> CVector &amp;a, <font class="keyword">const</font> CVector &amp;b, <font class="keyword">const</font> CVector &amp;c)<font class="keyword"> const
</font>00090 <font class="keyword"></font>{
00091         <font class="comment">// Trivial test.</font>
00092         <font class="keywordflow">if</font>(include(a) || include(b) || include(c))
00093                 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00094         <font class="comment">// Else, must test if the polygon intersect the pyamid.</font>
00095         CPlane          planes[6];
00096         makePyramid(planes);
00097         CPolygon        poly(a,b,c);
00098         poly.clip(planes, 6);
00099         <font class="keywordflow">if</font>(poly.getNumVertices()==0)
00100                 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00101         <font class="keywordflow">return</font> <font class="keyword">true</font>;
00102 }
00103 
00104 
00105 <font class="comment">// ***************************************************************************</font>
<a name="l00106"></a><a class="code" href="class_NL3D__CAABBox.html#a16">00106</a> <font class="keywordtype">void</font>                    CAABBox::makePyramid(CPlane     planes[6])<font class="keyword"> const
</font>00107 <font class="keyword"></font>{
00108         planes[0].make(CVector(-1,0,0), Center-HalfSize);
00109         planes[1].make(CVector(+1,0,0), Center+HalfSize);
00110         planes[2].make(CVector(0,-1,0), Center-HalfSize);
00111         planes[3].make(CVector(0,+1,0), Center+HalfSize);
00112         planes[4].make(CVector(0,0,-1), Center-HalfSize);
00113         planes[5].make(CVector(0,0,+1), Center+HalfSize);
00114 }
00115 
00116 
00117 <font class="comment">// ***************************************************************************</font>
<a name="l00118"></a><a class="code" href="class_NL3D__CAABBox.html#a17">00118</a> <font class="keywordtype">void</font>                    CAABBox::serial(<a class="code" href="class_NLMISC__IStream.html">NLMISC::IStream</a> &amp;f)<font class="keyword">
</font>00119 <font class="keyword"></font>{
00120         uint    ver= f.<a class="code" href="class_NLMISC__IStream.html#a36">serialVersion</a>(0);
00121         f.<a class="code" href="class_NLMISC__IStream.html#a3">serial</a>(Center);
00122         f.<a class="code" href="class_NLMISC__IStream.html#a3">serial</a>(HalfSize);
00123 }
00124 
00125 
00126 <font class="comment">// ***************************************************************************</font>
<a name="l00127"></a><a class="code" href="class_NL3D__CAABBox.html#a5">00127</a> <font class="keywordtype">void</font>    CAABBox::extend(<font class="keyword">const</font> CVector &amp;v)<font class="keyword">
</font>00128 <font class="keyword"></font>{
00129         CVector         bmin= getMin(), bmax= getMax();
00130 
00131         bmin.minof(bmin, v);
00132         bmax.maxof(bmax, v);
00133         setMinMax(bmin, bmax);
00134 }
00135 
00136 
00137 <font class="comment">// ***************************************************************************</font>
<a name="l00138"></a><a class="code" href="class_NL3D__CAABBoxExt.html#a13">00138</a> <font class="keywordtype">bool</font>    CAABBoxExt::clipFront(<font class="keyword">const</font> CPlane &amp;p)<font class="keyword"> const
</font>00139 <font class="keyword"></font>{
00140         <font class="comment">// Assume normalized planes.</font>
00141 
00142         <font class="comment">// if( SpherMax OUT )   return false.</font>
00143         <font class="keywordtype">float</font>   d= p*Center;
00144         <font class="keywordflow">if</font>(d&lt;-RadiusMax)
00145                 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00146         <font class="comment">// if( SphereMin IN )   return true;</font>
00147         <font class="keywordflow">if</font>(d&gt;-RadiusMin)
00148                 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00149 
00150         <font class="comment">// else, standard clip box.</font>
00151         <font class="keywordflow">return</font> CAABBox::clipFront(p);
00152 }
00153 
00154 
00155 <font class="comment">// ***************************************************************************</font>
<a name="l00156"></a><a class="code" href="class_NL3D__CAABBoxExt.html#a14">00156</a> <font class="keywordtype">bool</font>    CAABBoxExt::clipBack(<font class="keyword">const</font> CPlane &amp;p)<font class="keyword"> const
</font>00157 <font class="keyword"></font>{
00158         <font class="comment">// Assume normalized planes.</font>
00159 
00160         <font class="comment">// if( SpherMax OUT )   return false.</font>
00161         <font class="keywordtype">float</font>   d= p*Center;
00162         <font class="keywordflow">if</font>(d&gt;RadiusMax)
00163                 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00164         <font class="comment">// if( SphereMin IN )   return true;</font>
00165         <font class="keywordflow">if</font>(d&lt;RadiusMin)
00166                 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00167 
00168         <font class="comment">// else, standard clip box.</font>
00169         <font class="keywordflow">return</font> CAABBox::clipBack(p);
00170 }
00171 
00172 
00173 <font class="comment">// ***************************************************************************</font>
<a name="l00174"></a><a class="code" href="class_NL3D__CAABBoxExt.html#a16">00174</a> <font class="keywordtype">void</font>                    CAABBoxExt::serial(<a class="code" href="class_NLMISC__IStream.html">NLMISC::IStream</a> &amp;f)<font class="keyword">
</font>00175 <font class="keyword"></font>{
00176         CAABBox::serial(f);
00177         <font class="keywordflow">if</font>(f.<a class="code" href="class_NLMISC__IStream.html#a2">isReading</a>())
00178                 updateRadius();
00179 }
00180 
00181 
00182 } <font class="comment">// NL3D</font>
</div></pre>

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