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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&lt;&lt;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>&lt;<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>&lt;<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>&lt;<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>&lt;&lt;<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>&lt;&lt;(<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() &gt;&gt; 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>&amp;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&lt;<a class="code" href="noise__value_8cpp.html#a0">NL3D_NOISE_LEVEL</a>; i++)
00079                 {
00080                         _Sizes[i]= 1.0f / (1&lt;&lt;i);
00081                         sizeSum+= _Sizes[i];
00082                 }
00083                 <font class="comment">// normalize</font>
00084                 <font class="keywordflow">for</font>(i=0; i&lt;<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&lt;<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 &amp;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>&amp; (<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>&amp; (<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>&amp; (<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 &amp;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>&amp; (<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>&amp; (<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>&amp; (<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)&amp; (<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)&amp; (<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)&amp; (<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     &amp;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&lt;&lt;<a class="code" href="noise__value_8cpp.html#a1">NL3D_NOISE_GRID_SIZE_SHIFT</a>) + (uz&lt;&lt;(<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> &amp;<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 &amp;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 &amp;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>&lt;<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 &amp;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 &amp;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 &amp;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 &amp;posInWorld, CRGBAF &amp;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 &amp;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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