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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 &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) > 0) <font class="keywordflow">return</font> <font class="keyword">true</font>;
00040 <font class="keywordflow">if</font>(p*(Center - HalfSize) > 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) > 0) <font class="keywordflow">return</font> <font class="keyword">true</font>;
00043 <font class="keywordflow">if</font>(p*(Center - hswap) > 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) > 0) <font class="keywordflow">return</font> <font class="keyword">true</font>;
00046 <font class="keywordflow">if</font>(p*(Center - hswap) > 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) > 0) <font class="keywordflow">return</font> <font class="keyword">true</font>;
00049 <font class="keywordflow">if</font>(p*(Center - hswap) > 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 &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) < 0) <font class="keywordflow">return</font> <font class="keyword">true</font>;
00060 <font class="keywordflow">if</font>(p*(Center - HalfSize) < 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) < 0) <font class="keywordflow">return</font> <font class="keyword">true</font>;
00063 <font class="keywordflow">if</font>(p*(Center - hswap) < 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) < 0) <font class="keywordflow">return</font> <font class="keyword">true</font>;
00066 <font class="keywordflow">if</font>(p*(Center - hswap) < 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) < 0) <font class="keywordflow">return</font> <font class="keyword">true</font>;
00069 <font class="keywordflow">if</font>(p*(Center - hswap) < 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 &a)<font class="keyword"> const
</font>00077 <font class="keyword"></font>{
00078 <font class="keywordflow">if</font>(Center.x+HalfSize.x<a.x) <font class="keywordflow">return</font> <font class="keyword">false</font>;
00079 <font class="keywordflow">if</font>(Center.x-HalfSize.x>a.x) <font class="keywordflow">return</font> <font class="keyword">false</font>;
00080 <font class="keywordflow">if</font>(Center.y+HalfSize.y<a.y) <font class="keywordflow">return</font> <font class="keyword">false</font>;
00081 <font class="keywordflow">if</font>(Center.y-HalfSize.y>a.y) <font class="keywordflow">return</font> <font class="keyword">false</font>;
00082 <font class="keywordflow">if</font>(Center.z+HalfSize.z<a.z) <font class="keywordflow">return</font> <font class="keyword">false</font>;
00083 <font class="keywordflow">if</font>(Center.z-HalfSize.z>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 &a, <font class="keyword">const</font> CVector &b, <font class="keyword">const</font> CVector &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> &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 &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 &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<-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>-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 &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>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<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> &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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