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<hr><h1>quad_grid_clip_cluster.cpp</h1><a href="quad__grid__clip__cluster_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 
00007 <font class="comment">/* Copyright, 2001 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="std3d_8h.html">std3d.h</a>"</font>
00027 
00028 <font class="preprocessor">#include "<a class="code" href="quad__grid__clip__cluster_8h.html">3d/quad_grid_clip_cluster.h</a>"</font>
00029 
00030 
00031 <font class="keyword">using</font> <font class="keyword">namespace </font>NLMISC;
00032 <font class="keyword">using</font> <font class="keyword">namespace </font>std;
00033 
00034 
00035 <font class="keyword">namespace </font>NL3D {
00036 
00037 
00038 <font class="comment">// ***************************************************************************</font>
<a name="l00039"></a><a class="code" href="classNL3D_1_1CQuadGridClipCluster.html#d0">00039</a> <font class="keywordtype">void</font>            CQuadGridClipCluster::registerBasic()
00040 {
00041         CMOT::registerModel( <a class="code" href="namespaceNL3D.html#a224">QuadGridClipClusterId</a>, 0, CQuadGridClipCluster::creator);
00042         CMOT::registerObs( <a class="code" href="namespaceNL3D.html#a25">ClipTravId</a>, <a class="code" href="namespaceNL3D.html#a224">QuadGridClipClusterId</a>, CQuadGridClipClusterClipObs::creator );
00043 }
00044 
00045 
00046 <font class="comment">// ***************************************************************************</font>
<a name="l00047"></a><a class="code" href="classNL3D_1_1CQuadGridClipCluster.html#a0">00047</a> <font class="keywordtype">void</font>            CQuadGridClipCluster::extendCluster(<font class="keyword">const</font> <a class="code" href="classNLMISC_1_1CAABBox.html">NLMISC::CAABBox</a> &amp;worldBBox)
00048 {
00049         <font class="keywordflow">if</font>(_Empty)
00050         {
00051                 <a class="code" href="classNL3D_1_1CQuadGridClipCluster.html#o1">_Empty</a>= <font class="keyword">false</font>;
00052                 <a class="code" href="classNL3D_1_1CQuadGridClipCluster.html#o0">_BBox</a>= worldBBox;
00053         }
00054         <font class="keywordflow">else</font>
00055         {
00056                 <font class="comment">// extend the bbox with 2 corners of the incoming bbox (sufficient for an AABBox).</font>
00057                 <a class="code" href="classNL3D_1_1CQuadGridClipCluster.html#o0">_BBox</a>.<a class="code" href="classNLMISC_1_1CAABBox.html#z263_4">extend</a>( worldBBox.<a class="code" href="classNLMISC_1_1CAABBox.html#z264_4">getCenter</a>() + worldBBox.<a class="code" href="classNLMISC_1_1CAABBox.html#z264_5">getHalfSize</a>() );
00058                 <a class="code" href="classNL3D_1_1CQuadGridClipCluster.html#o0">_BBox</a>.<a class="code" href="classNLMISC_1_1CAABBox.html#z263_4">extend</a>( worldBBox.<a class="code" href="classNLMISC_1_1CAABBox.html#z264_4">getCenter</a>() - worldBBox.<a class="code" href="classNLMISC_1_1CAABBox.html#z264_5">getHalfSize</a>() );
00059         }
00060 
00061         <font class="comment">// update _Radius</font>
00062         <a class="code" href="classNL3D_1_1CQuadGridClipCluster.html#o3">_Radius</a>= <a class="code" href="classNL3D_1_1CQuadGridClipCluster.html#o0">_BBox</a>.<a class="code" href="classNLMISC_1_1CAABBox.html#z264_8">getRadius</a>();
00063 }
00064 
00065 
00066 <font class="comment">// ***************************************************************************</font>
<a name="l00067"></a><a class="code" href="classNL3D_1_1CQuadGridClipCluster.html#a2">00067</a> <font class="keywordtype">void</font>            CQuadGridClipCluster::update()
00068 {
00069         <font class="comment">// never need to update, so unlink me from ValidateList.</font>
00070         <a class="code" href="classNL3D_1_1IModel.html#z616_3">unlinkFromValidateList</a>();
00071 }
00072 
00073 
00074 <font class="comment">// ***************************************************************************</font>
<a name="l00075"></a><a class="code" href="classNL3D_1_1CQuadGridClipClusterClipObs.html#a0">00075</a> CQuadGridClipClusterClipObs::CQuadGridClipClusterClipObs()
00076 {
00077         <a class="code" href="classNL3D_1_1CQuadGridClipClusterClipObs.html#o0">_LastClipWasDistMaxClip</a>= <font class="keyword">false</font>;
00078         <a class="code" href="classNL3D_1_1CQuadGridClipClusterClipObs.html#o1">_LastClipWasFrustumClip</a>= <font class="keyword">false</font>;
00079 }
00080 
00081 <font class="comment">// ***************************************************************************</font>
<a name="l00082"></a><a class="code" href="classNL3D_1_1CQuadGridClipClusterClipObs.html#z744_0">00082</a> <font class="keywordtype">void</font>            CQuadGridClipClusterClipObs::traverse(IObs *caller)
00083 {
00084         CQuadGridClipCluster    *cluster= (CQuadGridClipCluster*)<a class="code" href="classNL3D_1_1IObs.html#m0">Model</a>;
00085         CClipTrav                       *clipTrav= (CClipTrav*)<a class="code" href="classNL3D_1_1IObs.html#m1">Trav</a>;
00086 
00087         <font class="comment">// if empty, just return (not visible at all).</font>
00088         <font class="keywordflow">if</font>(cluster-&gt;_Empty)
00089         {
00090                 <font class="comment">/* reset cache, to be sure that any instances added to this cluster later will </font>
00091 <font class="comment">                        be correctly updated if a clip of this cluster occurs.</font>
00092 <font class="comment">                */</font>
00093                 <a class="code" href="classNL3D_1_1CQuadGridClipClusterClipObs.html#o0">_LastClipWasDistMaxClip</a>= <font class="keyword">false</font>;
00094                 <a class="code" href="classNL3D_1_1CQuadGridClipClusterClipObs.html#o1">_LastClipWasFrustumClip</a>= <font class="keyword">false</font>;
00095                 <font class="keywordflow">return</font>;
00096         }
00097 
00098         <font class="comment">// First, clip DistMax.</font>
00099         CAABBox         &amp;bbox= cluster-&gt;_BBox;
00100         <font class="comment">// if clip DistMax enabled</font>
00101         <font class="keywordflow">if</font>(cluster-&gt;_DistMax!=-1)
00102         {
00103                 CVector         c= bbox.getCenter();
00104                 <font class="keywordtype">float</font>           dist= (c - clipTrav-&gt;CamPos).norm();
00105                 <font class="comment">// it the bbox is entirely out the distMax</font>
00106                 <font class="keywordflow">if</font>( dist-cluster-&gt;_Radius &gt; cluster-&gt;_DistMax )
00107                 {
00108                         <font class="comment">// if the cluster was DistMax-visible at last frame</font>
00109                         <font class="keywordflow">if</font>( !<a class="code" href="classNL3D_1_1CQuadGridClipClusterClipObs.html#o0">_LastClipWasDistMaxClip</a> )
00110                         {
00111                                 <font class="comment">// Advert sons of the clip. Important for CMeshMultiLodInstace. Do it for me and my sons.</font>
00112                                 <a class="code" href="classNL3D_1_1IBaseClipObs.html#a5">forceClip</a>(IBaseClipObs::DistMaxClip);
00113                                 <font class="comment">// new state.</font>
00114                                 <a class="code" href="classNL3D_1_1CQuadGridClipClusterClipObs.html#o0">_LastClipWasDistMaxClip</a>= <font class="keyword">true</font>;
00115                         }
00116                         <font class="comment">// quit</font>
00117                         <font class="keywordflow">return</font>;
00118                 }
00119                 <font class="keywordflow">else</font>
00120                 {
00121                         <font class="comment">// reset.</font>
00122                         <a class="code" href="classNL3D_1_1CQuadGridClipClusterClipObs.html#o0">_LastClipWasDistMaxClip</a>= <font class="keyword">false</font>;
00123                 }
00124         }
00125 
00126         <font class="comment">// Then clip against pyramid</font>
00127         <font class="keywordtype">bool</font>    unspecified= <font class="keyword">false</font>;
00128         <font class="keywordtype">bool</font>    visible= <font class="keyword">true</font>;
00129         <font class="keywordflow">for</font>(sint i=0;i&lt;(sint)clipTrav-&gt;WorldPyramid.size();i++)
00130         {
00131                 <font class="comment">// We are sure that pyramid has normalized plane normals.</font>
00132                 <font class="keywordflow">if</font>(!bbox.clipBack(clipTrav-&gt;WorldPyramid[i]))
00133                 {
00134                         visible= <font class="keyword">false</font>;
00135                         <font class="keywordflow">break</font>;
00136                 }
00137                 <font class="comment">// else test is the bbox is partially or fully in the plane</font>
00138                 <font class="keywordflow">else</font> <font class="keywordflow">if</font>(!unspecified)
00139                 {
00140                         <font class="comment">// if clipFront AND clipBack, it means partially.</font>
00141                         <font class="keywordflow">if</font>(bbox.clipFront(clipTrav-&gt;WorldPyramid[i]))
00142                                 unspecified= <font class="keyword">true</font>;
00143                 }
00144         }
00145 
00146         <font class="comment">// if ! visible at all, just skip sons.</font>
00147         <font class="keywordflow">if</font>(!visible)
00148         {
00149                 <font class="comment">// if the cluster was frustum visible at last frame</font>
00150                 <font class="keywordflow">if</font>( !<a class="code" href="classNL3D_1_1CQuadGridClipClusterClipObs.html#o1">_LastClipWasFrustumClip</a> )
00151                 {
00152                         <font class="comment">// Advert sons of the clip. Do it for me and my sons.</font>
00153                         <a class="code" href="classNL3D_1_1IBaseClipObs.html#a5">forceClip</a>(IBaseClipObs::FrustumClip);
00154                         <font class="comment">// new state.</font>
00155                         <a class="code" href="classNL3D_1_1CQuadGridClipClusterClipObs.html#o1">_LastClipWasFrustumClip</a>= <font class="keyword">true</font>;
00156                 }
00157         }
00158         <font class="keywordflow">else</font>
00159         {
00160                 <font class="comment">// reset frustum clip cache.</font>
00161                 <a class="code" href="classNL3D_1_1CQuadGridClipClusterClipObs.html#o1">_LastClipWasFrustumClip</a>= <font class="keyword">false</font>;
00162 
00163                 <font class="comment">// clip sons.</font>
00164                 <font class="keywordflow">if</font>(unspecified)
00165                 {
00166                         <font class="comment">// clip the sons individually </font>
00167                         <a class="code" href="classNL3D_1_1IObs.html#z620_0">traverseSons</a>();
00168                 }
00169                 <font class="keywordflow">else</font>
00170                 {
00171                         <font class="comment">// udpdate the sons, but don't clip, because we know they are fully visible.</font>
00172                         clipTrav-&gt;ForceNoFrustumClip= <font class="keyword">true</font>;
00173                         <a class="code" href="classNL3D_1_1IObs.html#z620_0">traverseSons</a>();
00174                         clipTrav-&gt;ForceNoFrustumClip= <font class="keyword">false</font>;
00175                 }
00176         }
00177 }
00178 
00179 
00180 } <font class="comment">// NL3D</font>
</pre></div>

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