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doxygen="_cgi:http://www.nevrax.org/cgi-bin/nel-search.cgi" href="http://www.nevrax.org/cgi-bin/nel-search.cgi">Search</a> </center> +<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> +</pre></div> + +<!-- footer --> +<BR><FONT Size=+5> </FONT> +</TD> +<TD WIDTH=15><IMG SRC=http://www.nevrax.org/inc/img/pixel.gif WIDTH=15 HEIGHT=15 BORDER=0 ALT=""></TD> +</TR> +</TABLE> +</BODY> +</HTML> |