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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>frustum.cpp</h1><a href="frustum_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 +00007 <font class="comment">/* Copyright, 2000 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="frustum_8h.html">nel/3d/frustum.h</a>"</font> +00029 <font class="preprocessor">#include "<a class="code" href="matrix_8h.html">nel/misc/matrix.h</a>"</font> +00030 <font class="preprocessor">#include <math.h></font> +00031 +00032 +00033 <font class="keyword">using</font> <font class="keyword">namespace </font>NLMISC; +00034 +00035 <font class="keyword">namespace </font>NL3D +00036 { +00037 +00038 +<a name="l00039"></a><a class="code" href="classNL3D_1_1CFrustum.html#a2">00039</a> <font class="keywordtype">void</font> CFrustum::init(<font class="keywordtype">float</font> left, <font class="keywordtype">float</font> right, <font class="keywordtype">float</font> bottom, <font class="keywordtype">float</font> top, <font class="keywordtype">float</font> znear, <font class="keywordtype">float</font> zfar, <font class="keywordtype">bool</font> perspective) +00040 { +00041 <a class="code" href="classNL3D_1_1CFrustum.html#m0">Left</a>= left; +00042 <a class="code" href="classNL3D_1_1CFrustum.html#m1">Right</a>= right; +00043 <a class="code" href="classNL3D_1_1CFrustum.html#m2">Bottom</a>= bottom; +00044 <a class="code" href="classNL3D_1_1CFrustum.html#m3">Top</a>= top; +00045 <a class="code" href="classNL3D_1_1CFrustum.html#m4">Near</a>= znear; +00046 <a class="code" href="classNL3D_1_1CFrustum.html#m5">Far</a>= zfar; +00047 <a class="code" href="classNL3D_1_1CFrustum.html#m6">Perspective</a>= perspective; +00048 } +00049 +<a name="l00050"></a><a class="code" href="classNL3D_1_1CFrustum.html#a3">00050</a> <font class="keywordtype">void</font> CFrustum::init(<font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a266">width</a>, <font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a267">height</a>, <font class="keywordtype">float</font> znear, <font class="keywordtype">float</font> zfar, <font class="keywordtype">bool</font> perspective) +00051 { +00052 <a class="code" href="classNL3D_1_1CFrustum.html#a2">init</a>(-<a class="code" href="driver__opengl__extension__def_8h.html#a266">width</a>/2, <a class="code" href="driver__opengl__extension__def_8h.html#a266">width</a>/2, -<a class="code" href="driver__opengl__extension__def_8h.html#a267">height</a>/2, <a class="code" href="driver__opengl__extension__def_8h.html#a267">height</a>/2, znear, zfar, perspective); +00053 } +<a name="l00054"></a><a class="code" href="classNL3D_1_1CFrustum.html#a4">00054</a> <font class="keywordtype">void</font> CFrustum::initPerspective(<font class="keywordtype">float</font> fov, <font class="keywordtype">float</font> aspectRatio, <font class="keywordtype">float</font> znear, <font class="keywordtype">float</font> zfar) +00055 { +00056 <font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>,h; +00057 <a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>= 2*znear*(float)tan(fov/2); +00058 h= <a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>/aspectRatio; +00059 <a class="code" href="classNL3D_1_1CFrustum.html#a2">init</a>(<a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>,h,znear,zfar,<font class="keyword">true</font>); +00060 } +<a name="l00061"></a><a class="code" href="classNL3D_1_1CFrustum.html#a5">00061</a> <font class="keywordtype">void</font> CFrustum::getValues(<font class="keywordtype">float</font> &left, <font class="keywordtype">float</font> &right, <font class="keywordtype">float</font> &bottom, <font class="keywordtype">float</font> &top, <font class="keywordtype">float</font> &znear, <font class="keywordtype">float</font> &zfar)<font class="keyword"> const</font> +00062 <font class="keyword"></font>{ +00063 left= <a class="code" href="classNL3D_1_1CFrustum.html#m0">Left</a>; +00064 right= <a class="code" href="classNL3D_1_1CFrustum.html#m1">Right</a>; +00065 bottom= <a class="code" href="classNL3D_1_1CFrustum.html#m2">Bottom</a>; +00066 top= <a class="code" href="classNL3D_1_1CFrustum.html#m3">Top</a>; +00067 znear= <a class="code" href="classNL3D_1_1CFrustum.html#m4">Near</a>; +00068 zfar= <a class="code" href="classNL3D_1_1CFrustum.html#m5">Far</a>; +00069 } +00070 +00071 +00072 <font class="comment">// ***************************************************************************</font> +<a name="l00073"></a><a class="code" href="classNL3D_1_1CFrustum.html#a6">00073</a> CVector CFrustum::project(<font class="keyword">const</font> CVector &vec)<font class="keyword"> const</font> +00074 <font class="keyword"></font>{ +00075 CVector ret; +00076 <font class="keywordtype">float</font> decalX, decalY; +00077 <font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>, h; +00078 <font class="keywordtype">float</font> OOw, OOh; +00079 +00080 <font class="comment">// Fast transform to openGL like axis.</font> +00081 CVector pt; +00082 pt.x= vec.x; +00083 pt.y= vec.z; +00084 pt.z= -vec.y; +00085 +00086 decalX= (<a class="code" href="classNL3D_1_1CFrustum.html#m1">Right</a>+<a class="code" href="classNL3D_1_1CFrustum.html#m0">Left</a>); +00087 decalY= (<a class="code" href="classNL3D_1_1CFrustum.html#m3">Top</a>+<a class="code" href="classNL3D_1_1CFrustum.html#m2">Bottom</a>); +00088 <a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>= <a class="code" href="classNL3D_1_1CFrustum.html#m1">Right</a>-<a class="code" href="classNL3D_1_1CFrustum.html#m0">Left</a>; +00089 h= <a class="code" href="classNL3D_1_1CFrustum.html#m3">Top</a>-<a class="code" href="classNL3D_1_1CFrustum.html#m2">Bottom</a>; +00090 OOw= 1.0f/<a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>; +00091 OOh= 1.0f/h; +00092 +00093 <font class="comment">// project to -1..+1.</font> +00094 <font class="keywordflow">if</font>(Perspective) +00095 { +00096 ret.x= (2*<a class="code" href="classNL3D_1_1CFrustum.html#m4">Near</a>*pt.x + decalX*pt.z)*OOw; +00097 ret.x/= -pt.z; +00098 ret.y= (2*<a class="code" href="classNL3D_1_1CFrustum.html#m4">Near</a>*pt.y + decalY*pt.z)*OOh; +00099 ret.y/= -pt.z; +00100 } +00101 <font class="keywordflow">else</font> +00102 { +00103 ret.x= (2*pt.x-decalX)*OOw; +00104 ret.y= (2*pt.y-decalY)*OOh; +00105 } +00106 +00107 +00108 <font class="comment">// Map it to 0..1.</font> +00109 ret.x= 0.5f*(ret.x+1); +00110 ret.y= 0.5f*(ret.y+1); +00111 ret.z= 0; +00112 +00113 <font class="keywordflow">return</font> ret; +00114 } +00115 +00116 +00117 +00118 <font class="comment">// ***************************************************************************</font> +<a name="l00119"></a><a class="code" href="classNL3D_1_1CFrustum.html#a7">00119</a> CVector CFrustum::unProject(<font class="keyword">const</font> CVector &vec)<font class="keyword"> const</font> +00120 <font class="keyword"></font>{ +00121 CVector ret; +00122 <font class="keywordtype">float</font> decalX, decalY; +00123 <font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>, h; +00124 <font class="keywordtype">float</font> OOw, OOh; +00125 +00126 decalX= (<a class="code" href="classNL3D_1_1CFrustum.html#m1">Right</a>+<a class="code" href="classNL3D_1_1CFrustum.html#m0">Left</a>); +00127 decalY= (<a class="code" href="classNL3D_1_1CFrustum.html#m3">Top</a>+<a class="code" href="classNL3D_1_1CFrustum.html#m2">Bottom</a>); +00128 <a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>= <a class="code" href="classNL3D_1_1CFrustum.html#m1">Right</a>-<a class="code" href="classNL3D_1_1CFrustum.html#m0">Left</a>; +00129 h= <a class="code" href="classNL3D_1_1CFrustum.html#m3">Top</a>-<a class="code" href="classNL3D_1_1CFrustum.html#m2">Bottom</a>; +00130 OOw= 1.0f/<a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>; +00131 OOh= 1.0f/h; +00132 +00133 <font class="comment">// vec is a vector in a left hand axis.</font> +00134 CVector pt; +00135 pt.x= vec.x; +00136 pt.y= vec.y; +00137 pt.z= vec.z; +00138 +00139 <font class="comment">// Map it to -1..1</font> +00140 pt.x= 2*(pt.x-0.5f); +00141 pt.y= 2*(pt.y-0.5f); +00142 +00143 <font class="comment">// Map Z to Near..Far.</font> +00144 <font class="comment">// Z IN is 1/Z, and is in 0..1.</font> +00145 <font class="comment">// inverse to 1..0.</font> +00146 pt.z= 1-pt.z; +00147 <font class="comment">// Map ret.z to 1/Far..1/Near.</font> +00148 pt.z= 1/<a class="code" href="classNL3D_1_1CFrustum.html#m5">Far</a>+(1/<a class="code" href="classNL3D_1_1CFrustum.html#m4">Near</a>-1/<a class="code" href="classNL3D_1_1CFrustum.html#m5">Far</a>)*pt.z; +00149 <font class="comment">// Inverse, so ret.z E Near..Far.</font> +00150 pt.z= 1/pt.z; +00151 <font class="comment">// Actually, pt.z==w, homogenous coordinate.</font> +00152 +00153 +00154 <font class="comment">// unproject</font> +00155 <font class="keywordflow">if</font>(Perspective) +00156 { +00157 <font class="comment">// w of homogenous coordinate.</font> +00158 <font class="keywordtype">float</font> Wh; +00159 <font class="keywordtype">float</font> Zin; +00160 Wh= pt.z; +00161 Zin= -pt.z; +00162 +00163 <font class="comment">// unproject. (Projection is: x'= x/w. y'= y/w).</font> +00164 pt.x= pt.x*Wh; +00165 pt.y= pt.y*Wh; +00166 ret.x= (pt.x*<a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>-decalX*Zin)/(2*<a class="code" href="classNL3D_1_1CFrustum.html#m4">Near</a>); +00167 ret.y= (pt.y*<a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>-decalY*Zin)/(2*<a class="code" href="classNL3D_1_1CFrustum.html#m4">Near</a>); +00168 ret.z= Zin; +00169 } +00170 <font class="keywordflow">else</font> +00171 { +00172 <font class="comment">// NOT DONE YET.</font> +00173 <a class="code" href="debug_8h.html#a12">nlstop</a>; +00174 <font class="comment">/*ret.x= (pt.x*w+decalX)/2;</font> +00175 <font class="comment"> ret.y= (pt.y*h+decalY)/2;</font> +00176 <font class="comment"> */</font> +00177 } +00178 +00179 <font class="comment">// Fast transform from openGL like axis.</font> +00180 pt =ret; +00181 ret.x= pt.x; +00182 ret.y= -pt.z; +00183 ret.z= pt.y; +00184 +00185 <font class="keywordflow">return</font> ret; +00186 } +00187 +00188 +00189 +00190 } <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> |