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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> &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->_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 &bbox= cluster->_BBox;
00100 <font class="comment">// if clip DistMax enabled</font>
00101 <font class="keywordflow">if</font>(cluster->_DistMax!=-1)
00102 {
00103 CVector c= bbox.getCenter();
00104 <font class="keywordtype">float</font> dist= (c - clipTrav->CamPos).norm();
00105 <font class="comment">// it the bbox is entirely out the distMax</font>
00106 <font class="keywordflow">if</font>( dist-cluster->_Radius > cluster->_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<(sint)clipTrav->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->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->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->ForceNoFrustumClip= <font class="keyword">true</font>;
00173 <a class="code" href="classNL3D_1_1IObs.html#z620_0">traverseSons</a>();
00174 clipTrav->ForceNoFrustumClip= <font class="keyword">false</font>;
00175 }
00176 }
00177 }
00178
00179
00180 } <font class="comment">// NL3D</font>
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