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<hr><h1>noise_value.cpp</h1><a href="noise__value_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="noise__value_8h.html">3d/noise_value.h</a>"</font>
00029 <font class="preprocessor">#include "<a class="code" href="fast__floor_8h.html">3d/fast_floor.h</a>"</font>
00030
00031 <font class="keyword">using</font> <font class="keyword">namespace </font>NLMISC;
00032
00033 <font class="keyword">namespace </font>NL3D
00034 {
00035
00036
00037 <font class="comment">// 3 level: best quality/speed ratio.</font>
<a name="l00038"></a><a class="code" href="noise__value_8cpp.html#a0">00038</a> <font class="preprocessor">#define NL3D_NOISE_LEVEL 3</font>
<a name="l00039"></a><a class="code" href="noise__value_8cpp.html#a1">00039</a> <font class="preprocessor"></font><font class="preprocessor">#define NL3D_NOISE_GRID_SIZE_SHIFT 5</font>
<a name="l00040"></a><a class="code" href="noise__value_8cpp.html#a2">00040</a> <font class="preprocessor"></font><font class="preprocessor">#define NL3D_NOISE_GRID_SIZE (1<<NL3D_NOISE_GRID_SIZE_SHIFT)</font>
00041 <font class="preprocessor"></font><font class="keyword">static</font> <font class="keyword">const</font> <font class="keywordtype">float</font> <a class="code" href="namespaceNL3D.html#a162">NL3D_OO255</a>= 1.0f / 255;
00042
00043 <font class="comment">// ***************************************************************************</font>
00044 <font class="comment">// ***************************************************************************</font>
00045 <font class="comment">// ***************************************************************************</font>
00046
00047 <font class="comment">// ***************************************************************************</font>
<a name="l00049"></a><a class="code" href="classNL3D_1_1CRandomGrid3D.html">00049</a> <font class="comment">class CRandomGrid3D</font>
00050 {
00051 <font class="keyword">public</font>:
00052
00053 <font class="comment">// generate a random grid, with same seed.</font>
<a name="l00054"></a><a class="code" href="classNL3D_1_1CRandomGrid3D.html#a0">00054</a> CRandomGrid3D()
00055 {
00056 <font class="comment">//seed</font>
00057 srand(0);
00058
00059 <font class="comment">// init the grid</font>
00060 <font class="keywordflow">for</font>(uint <a class="code" href="driver__opengl__extension__def_8h.html#a366">z</a>=0; <a class="code" href="driver__opengl__extension__def_8h.html#a366">z</a><<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>; <a class="code" href="driver__opengl__extension__def_8h.html#a366">z</a>++)
00061 {
00062 <font class="keywordflow">for</font>(uint <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>=0; <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a><<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>; <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>++)
00063 {
00064 <font class="keywordflow">for</font>(uint <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>=0; <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a><<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>; <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>++)
00065 {
00066 uint <a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>= <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a> + (<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a><<<a class="code" href="noise__value_8cpp.html#a1">NL3D_NOISE_GRID_SIZE_SHIFT</a>) + (<a class="code" href="driver__opengl__extension__def_8h.html#a366">z</a><<(<a class="code" href="noise__value_8cpp.html#a1">NL3D_NOISE_GRID_SIZE_SHIFT</a>*2));
00067 <font class="comment">// take higher bits of rand gives better result.</font>
00068 uint <a class="code" href="driver__opengl__extension__def_8h.html#a368">v</a>= rand() >> 5;
00069 _Texture3d[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>]= <a class="code" href="driver__opengl__extension__def_8h.html#a368">v</a>&255;
00070 }
00071 }
00072 }
00073
00074 <font class="comment">// init sizes.</font>
00075 uint i;
00076 <font class="comment">// sum of sizes must be 1, and each level must be /2.</font>
00077 <font class="keywordtype">float</font> sizeSum=0;
00078 <font class="keywordflow">for</font>(i=0; i<<a class="code" href="noise__value_8cpp.html#a0">NL3D_NOISE_LEVEL</a>; i++)
00079 {
00080 _Sizes[i]= 1.0f / (1<<i);
00081 sizeSum+= _Sizes[i];
00082 }
00083 <font class="comment">// normalize</font>
00084 <font class="keywordflow">for</font>(i=0; i<<a class="code" href="noise__value_8cpp.html#a0">NL3D_NOISE_LEVEL</a>; i++)
00085 {
00086 _Sizes[i]/= sizeSum;
00087 }
00088
00089 <font class="comment">// init LevelPhases.</font>
00090 <font class="keywordflow">for</font>(i=0; i<<a class="code" href="noise__value_8cpp.html#a0">NL3D_NOISE_LEVEL</a>; i++)
00091 {
00092 _LevelPhase[i].x= <a class="code" href="namespaceNLMISC.html#a212">frand</a>(<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>);
00093 _LevelPhase[i].y= <a class="code" href="namespaceNLMISC.html#a212">frand</a>(<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>);
00094 _LevelPhase[i].z= <a class="code" href="namespaceNLMISC.html#a212">frand</a>(<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>);
00095 }
00096 <font class="comment">// not for level 0.</font>
00097 _LevelPhase[0]= CVector::Null;
00098 }
00099
00100 <font class="comment">// x/y/z are use to lookup directly in the grid 3D.</font>
<a name="l00101"></a><a class="code" href="classNL3D_1_1CRandomGrid3D.html#d0">00101</a> <font class="keyword">static</font> <font class="keyword">inline</font> <font class="keywordtype">float</font> evalNearest(<font class="keyword">const</font> CVector &pos)
00102 {
00103 <font class="comment">// compute integer part.</font>
00104 sint <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>= <a class="code" href="namespaceNL3D.html#a362">OptFastFloor</a>(pos.x);
00105 sint <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>= <a class="code" href="namespaceNL3D.html#a362">OptFastFloor</a>(pos.y);
00106 sint <a class="code" href="driver__opengl__extension__def_8h.html#a366">z</a>= <a class="code" href="namespaceNL3D.html#a362">OptFastFloor</a>(pos.z);
00107 <font class="comment">// index in texture.</font>
00108 uint ux= <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>& (<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>-1);
00109 uint uy= <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>& (<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>-1);
00110 uint uz= <a class="code" href="driver__opengl__extension__def_8h.html#a366">z</a>& (<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>-1);
00111
00112 <font class="comment">// read the texture.</font>
00113 <font class="keywordtype">float</font> turb= lookup(ux,uy,uz);
00114
00115 <font class="keywordflow">return</font> turb*<a class="code" href="namespaceNL3D.html#a162">NL3D_OO255</a>;
00116 }
00117
00118 <font class="comment">// x/y/z are use to lookup directly in the grid 3D.</font>
<a name="l00119"></a><a class="code" href="classNL3D_1_1CRandomGrid3D.html#d1">00119</a> <font class="keyword">static</font> <font class="keyword">inline</font> <font class="keywordtype">float</font> evalBiLinear(<font class="keyword">const</font> CVector &pos)
00120 {
00121 <font class="comment">// compute integer part.</font>
00122 sint <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>= <a class="code" href="namespaceNL3D.html#a362">OptFastFloor</a>(pos.x);
00123 sint <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>= <a class="code" href="namespaceNL3D.html#a362">OptFastFloor</a>(pos.y);
00124 sint <a class="code" href="driver__opengl__extension__def_8h.html#a366">z</a>= <a class="code" href="namespaceNL3D.html#a362">OptFastFloor</a>(pos.z);
00125 <font class="comment">// index in texture.</font>
00126 uint ux= <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>& (<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>-1);
00127 uint uy= <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>& (<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>-1);
00128 uint uz= <a class="code" href="driver__opengl__extension__def_8h.html#a366">z</a>& (<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>-1);
00129 uint ux2= (<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>+1)& (<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>-1);
00130 uint uy2= (<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>+1)& (<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>-1);
00131 uint uz2= (<a class="code" href="driver__opengl__extension__def_8h.html#a366">z</a>+1)& (<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>-1);
00132 <font class="comment">// delta.</font>
00133 <font class="keywordtype">float</font> dx2;
00134 <font class="keywordtype">float</font> dy2;
00135 <font class="keywordtype">float</font> dz2;
00136 easeInEaseOut(dx2, pos.x-<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>);
00137 easeInEaseOut(dy2, pos.y-<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>);
00138 easeInEaseOut(dz2, pos.z-<a class="code" href="driver__opengl__extension__def_8h.html#a366">z</a>);
00139 <font class="keywordtype">float</font> dx= 1-dx2;
00140 <font class="keywordtype">float</font> dy= 1-dy2;
00141 <font class="keywordtype">float</font> dz= 1-dz2;
00142 <font class="comment">// TriLinear in texture3D.</font>
00143 <font class="keywordtype">float</font> turb=0;
00144 <font class="keywordtype">float</font> dxdy= dx*dy;
00145 turb+= lookup(ux,uy,uz)* dxdy*dz;
00146 turb+= lookup(ux,uy,uz2)* dxdy*dz2;
00147 <font class="keywordtype">float</font> dxdy2= dx*dy2;
00148 turb+= lookup(ux,uy2,uz)* dxdy2*dz;
00149 turb+= lookup(ux,uy2,uz2)* dxdy2*dz2;
00150 <font class="keywordtype">float</font> dx2dy= dx2*dy;
00151 turb+= lookup(ux2,uy,uz)* dx2dy*dz;
00152 turb+= lookup(ux2,uy,uz2)* dx2dy*dz2;
00153 <font class="keywordtype">float</font> dx2dy2= dx2*dy2;
00154 turb+= lookup(ux2,uy2,uz)* dx2dy2*dz;
00155 turb+= lookup(ux2,uy2,uz2)* dx2dy2*dz2;
00156
00157 <font class="comment">// End!</font>
00158 <font class="keywordflow">return</font> turb*<a class="code" href="namespaceNL3D.html#a162">NL3D_OO255</a>;
00159 }
00160
00161
00162 <font class="comment">// get size according to level</font>
<a name="l00163"></a><a class="code" href="classNL3D_1_1CRandomGrid3D.html#d2">00163</a> <font class="keyword">static</font> <font class="keyword">inline</font> <font class="keywordtype">float</font> getLevelSize(uint <a class="code" href="driver__opengl__extension__def_8h.html#a387">level</a>)
00164 {
00165 <font class="keywordflow">return</font> _Sizes[<a class="code" href="driver__opengl__extension__def_8h.html#a387">level</a>];
00166 }
00167
00168 <font class="comment">// get an additional level phase.</font>
<a name="l00169"></a><a class="code" href="classNL3D_1_1CRandomGrid3D.html#d3">00169</a> <font class="keyword">static</font> <font class="keyword">inline</font> <font class="keyword">const</font> CVector &getLevelPhase(uint <a class="code" href="driver__opengl__extension__def_8h.html#a387">level</a>)
00170 {
00171 <font class="keywordflow">return</font> _LevelPhase[<a class="code" href="driver__opengl__extension__def_8h.html#a387">level</a>];
00172 }
00173
00174
00175 <font class="comment">// **************</font>
00176 <font class="keyword">private</font>:
00177
00178 <font class="keyword">static</font> uint8 _Texture3d[<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>*<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>*<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>];
00179 <font class="keyword">static</font> <font class="keywordtype">float</font> _Sizes[<a class="code" href="noise__value_8cpp.html#a0">NL3D_NOISE_LEVEL</a>];
00180 <font class="keyword">static</font> CVector _LevelPhase[<a class="code" href="noise__value_8cpp.html#a0">NL3D_NOISE_LEVEL</a>];
00181
00182
00183 <font class="comment">// lookup with no mod.</font>
<a name="l00184"></a><a class="code" href="classNL3D_1_1CRandomGrid3D.html#f0">00184</a> <font class="keyword">static</font> <font class="keyword">inline</font> <font class="keywordtype">float</font> lookup(uint ux, uint uy, uint uz)
00185 {
00186 uint <a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>= ux + (uy<<<a class="code" href="noise__value_8cpp.html#a1">NL3D_NOISE_GRID_SIZE_SHIFT</a>) + (uz<<(<a class="code" href="noise__value_8cpp.html#a1">NL3D_NOISE_GRID_SIZE_SHIFT</a>*2));
00187 <font class="keywordflow">return</font> _Texture3d[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>];
00188 }
00189
00190 <font class="comment">// easineasout</font>
<a name="l00191"></a><a class="code" href="classNL3D_1_1CRandomGrid3D.html#f1">00191</a> <font class="keyword">static</font> <font class="keyword">inline</font> <font class="keywordtype">void</font> easeInEaseOut(<font class="keywordtype">float</font> &<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>, <font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>)
00192 {
00193 <font class="comment">// cubic such that f(0)=0, f'(0)=0, f(1)=1, f'(1)=0.</font>
00194 <font class="keywordtype">float</font> x2=<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>*<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>;
00195 <font class="keywordtype">float</font> x3=x2*<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>;
00196 <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>= -2*x3 + 3*x2;
00197 }
00198
00199 };
00200
00201
<a name="l00202"></a><a class="code" href="classNL3D_1_1CRandomGrid3D.html#r0">00202</a> uint8 CRandomGrid3D::_Texture3d[<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>*<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>*<a class="code" href="noise__value_8cpp.html#a2">NL3D_NOISE_GRID_SIZE</a>];
<a name="l00203"></a><a class="code" href="classNL3D_1_1CRandomGrid3D.html#r1">00203</a> <font class="keywordtype">float</font> CRandomGrid3D::_Sizes[<a class="code" href="noise__value_8cpp.html#a0">NL3D_NOISE_LEVEL</a>];
<a name="l00204"></a><a class="code" href="classNL3D_1_1CRandomGrid3D.html#r2">00204</a> CVector CRandomGrid3D::_LevelPhase[<a class="code" href="noise__value_8cpp.html#a0">NL3D_NOISE_LEVEL</a>];
00205
00206 <font class="comment">// just to init the static arrays.</font>
00207 <font class="keyword">static</font> CRandomGrid3D <a class="code" href="namespaceNL3D.html#a163">NL3D_RandomGrid3D</a>;
00208
00209
00210 <font class="comment">// ***************************************************************************</font>
00211 <font class="comment">// ***************************************************************************</font>
00212 <font class="comment">// ***************************************************************************</font>
00213
00214
00215 <font class="comment">// ***************************************************************************</font>
<a name="l00216"></a><a class="code" href="classNL3D_1_1CNoiseValue.html#c1">00216</a> <font class="keywordtype">float</font> CNoiseValue::evalRandom(<font class="keyword">const</font> CVector &pos)<font class="keyword"> const</font>
00217 <font class="keyword"></font>{
00218 <font class="keywordflow">return</font> CRandomGrid3D::evalNearest(pos);
00219 }
00220
00221
00222 <font class="comment">// ***************************************************************************</font>
<a name="l00223"></a><a class="code" href="classNL3D_1_1CNoiseValue.html#c0">00223</a> <font class="keywordtype">float</font> CNoiseValue::noise(<font class="keyword">const</font> CVector &pos)<font class="keyword"> const</font>
00224 <font class="keyword"></font>{
00225 <font class="comment">// eval "fractaly".</font>
00226 <font class="keywordtype">float</font> turb;
00227
00228 <font class="preprocessor">#if (NL3D_NOISE_LEVEL != 3)</font>
00229 <font class="preprocessor"></font> CVector vd= pos;
00230 turb=0;
00231 <font class="keywordflow">for</font>(uint <a class="code" href="driver__opengl__extension__def_8h.html#a387">level</a>=0;<a class="code" href="driver__opengl__extension__def_8h.html#a387">level</a><<a class="code" href="noise__value_8cpp.html#a0">NL3D_NOISE_LEVEL</a>;<a class="code" href="driver__opengl__extension__def_8h.html#a387">level</a>++)
00232 {
00233 <font class="comment">// Add the influence of the ith level.</font>
00234 turb+= CRandomGrid3D::getLevelSize(<a class="code" href="driver__opengl__extension__def_8h.html#a387">level</a>) *
00235 CRandomGrid3D::evalBiLinear(vd + CRandomGrid3D::getLevelPhase(<a class="code" href="driver__opengl__extension__def_8h.html#a387">level</a>) );
00236 <font class="comment">// Next level at higher frequency</font>
00237 vd*= 2;
00238 }
00239 <font class="preprocessor">#else</font>
00240 <font class="preprocessor"></font> <font class="comment">// special case. unrolled loop.</font>
00241 <font class="comment">// level 0 has no phase.</font>
00242 turb= CRandomGrid3D::getLevelSize(0) *
00243 CRandomGrid3D::evalBiLinear(pos);
00244 <font class="comment">// level 1</font>
00245 turb+= CRandomGrid3D::getLevelSize(1) *
00246 CRandomGrid3D::evalBiLinear(pos*2 + CRandomGrid3D::getLevelPhase(1) );
00247 <font class="comment">// level 2</font>
00248 turb+= CRandomGrid3D::getLevelSize(2) *
00249 CRandomGrid3D::evalBiLinear(pos*4 + CRandomGrid3D::getLevelPhase(2) );
00250 <font class="preprocessor">#endif</font>
00251 <font class="preprocessor"></font>
00252 <font class="keywordflow">return</font> turb;
00253 }
00254
00255
00256
00257 <font class="comment">// ***************************************************************************</font>
<a name="l00258"></a><a class="code" href="classNL3D_1_1CNoiseValue.html#a0">00258</a> CNoiseValue::CNoiseValue()
00259 {
00260 <a class="code" href="classNL3D_1_1CNoiseValue.html#m0">Abs</a>= 0;
00261 <a class="code" href="classNL3D_1_1CNoiseValue.html#m1">Rand</a>= 1;
00262 <a class="code" href="classNL3D_1_1CNoiseValue.html#m2">Frequency</a>= 1;
00263 }
00264
00265
00266 <font class="comment">// ***************************************************************************</font>
<a name="l00267"></a><a class="code" href="classNL3D_1_1CNoiseValue.html#a1">00267</a> CNoiseValue::CNoiseValue(<font class="keywordtype">float</font> abs, <font class="keywordtype">float</font> rand, <font class="keywordtype">float</font> freq)
00268 {
00269 <a class="code" href="classNL3D_1_1CNoiseValue.html#m0">Abs</a>= abs;
00270 <a class="code" href="classNL3D_1_1CNoiseValue.html#m1">Rand</a>= rand;
00271 <a class="code" href="classNL3D_1_1CNoiseValue.html#m2">Frequency</a>= freq;
00272 }
00273
00274
00275 <font class="comment">// ***************************************************************************</font>
<a name="l00276"></a><a class="code" href="classNL3D_1_1CNoiseValue.html#a2">00276</a> <font class="keywordtype">float</font> CNoiseValue::eval(<font class="keyword">const</font> CVector &posInWorld)<font class="keyword"> const</font>
00277 <font class="keyword"></font>{
00278 <font class="comment">// A single cube in the Grid3d correspond to Frequency==1.</font>
00279 <font class="comment">// So enlarging size of the grid3d do not affect the frequency aspect.</font>
00280 <font class="keywordflow">return</font> <a class="code" href="classNL3D_1_1CNoiseValue.html#m0">Abs</a> + <a class="code" href="classNL3D_1_1CNoiseValue.html#m1">Rand</a> * <a class="code" href="classNL3D_1_1CNoiseValue.html#c0">noise</a>(posInWorld*<a class="code" href="classNL3D_1_1CNoiseValue.html#m2">Frequency</a>);
00281 }
00282
00283
00284 <font class="comment">// ***************************************************************************</font>
<a name="l00285"></a><a class="code" href="classNL3D_1_1CNoiseValue.html#a3">00285</a> <font class="keywordtype">float</font> CNoiseValue::evalOneLevelRandom(<font class="keyword">const</font> CVector &posInWorld)<font class="keyword"> const</font>
00286 <font class="keyword"></font>{
00287 <font class="comment">// A single cube in the Grid3d correspond to Frequency==1.</font>
00288 <font class="comment">// So enlarging size of the grid3d do not affect the frequency aspect.</font>
00289 <font class="keywordflow">return</font> <a class="code" href="classNL3D_1_1CNoiseValue.html#m0">Abs</a> + <a class="code" href="classNL3D_1_1CNoiseValue.html#m1">Rand</a> * <a class="code" href="classNL3D_1_1CNoiseValue.html#c1">evalRandom</a>(posInWorld*<a class="code" href="classNL3D_1_1CNoiseValue.html#m2">Frequency</a>);
00290 }
00291
00292
00293 <font class="comment">// ***************************************************************************</font>
<a name="l00294"></a><a class="code" href="classNL3D_1_1CNoiseValue.html#a4">00294</a> <font class="keywordtype">void</font> CNoiseValue::serial(IStream &f)
00295 {
00296 (void)f.serialVersion(0);
00297 f.serial(<a class="code" href="classNL3D_1_1CNoiseValue.html#m0">Abs</a>);
00298 f.serial(<a class="code" href="classNL3D_1_1CNoiseValue.html#m1">Rand</a>);
00299 f.serial(<a class="code" href="classNL3D_1_1CNoiseValue.html#m2">Frequency</a>);
00300 }
00301
00302
00303 <font class="comment">// ***************************************************************************</font>
00304 <font class="comment">// ***************************************************************************</font>
00305 <font class="comment">// ***************************************************************************</font>
00306
00307
00308 <font class="comment">// ***************************************************************************</font>
<a name="l00309"></a><a class="code" href="classNL3D_1_1CNoiseColorGradient.html#a0">00309</a> <font class="keywordtype">void</font> CNoiseColorGradient::eval(<font class="keyword">const</font> CVector &posInWorld, CRGBAF &result)<font class="keyword"> const</font>
00310 <font class="keyword"></font>{
00311 <font class="comment">// test if not null grads.</font>
00312 uint nGrads= <a class="code" href="classNL3D_1_1CNoiseColorGradient.html#m1">Gradients</a>.size();
00313 <font class="keywordflow">if</font>(nGrads==0)
00314 <font class="keywordflow">return</font>;
00315 <font class="comment">// if only one color, easy</font>
00316 <font class="keywordflow">if</font>(nGrads==1)
00317 {
00318 result= <a class="code" href="classNL3D_1_1CNoiseColorGradient.html#m1">Gradients</a>[0];
00319 }
00320 <font class="keywordflow">else</font>
00321 {
00322 <font class="comment">// eval noise</font>
00323 <font class="keywordtype">float</font> f= <a class="code" href="classNL3D_1_1CNoiseColorGradient.html#m0">NoiseValue</a>.eval(posInWorld) * (nGrads-1);
00324 <a class="code" href="namespaceNLMISC.html#a215">clamp</a>(f, 0.f, (<font class="keywordtype">float</font>)(nGrads-1));
00325 <font class="comment">// look up in table of gradients.</font>
00326 uint <a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>= <a class="code" href="namespaceNL3D.html#a362">OptFastFloor</a>(f);
00327 <a class="code" href="namespaceNLMISC.html#a215">clamp</a>(<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>, 0U, nGrads-2);
00328 <font class="comment">// fractionnal part.</font>
00329 f= f-<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>;
00330 <a class="code" href="namespaceNLMISC.html#a215">clamp</a>(f, 0, 1);
00331 <font class="comment">// interpolate the gradient.</font>
00332 result= <a class="code" href="classNL3D_1_1CNoiseColorGradient.html#m1">Gradients</a>[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>]*(1-f) + <a class="code" href="classNL3D_1_1CNoiseColorGradient.html#m1">Gradients</a>[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>+1]*f;
00333 }
00334 }
00335
00336 <font class="comment">// ***************************************************************************</font>
<a name="l00337"></a><a class="code" href="classNL3D_1_1CNoiseColorGradient.html#a1">00337</a> <font class="keywordtype">void</font> CNoiseColorGradient::serial(IStream &f)
00338 {
00339 (void)f.serialVersion(0);
00340 f.serial(<a class="code" href="classNL3D_1_1CNoiseColorGradient.html#m0">NoiseValue</a>);
00341 f.serialCont(<a class="code" href="classNL3D_1_1CNoiseColorGradient.html#m1">Gradients</a>);
00342 }
00343
00344
00345
00346 } <font class="comment">// NL3D</font>
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