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  76. 

  77. <div class="header">
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    79. 

  79. <a href="#func-members">Functions</a>  </div>
    80. 

  80.   <div class="headertitle">
    81. 

  81. <div class="title">Geometric functions<div class="ingroups"><a class="el" href="a00280.html">Core features</a></div></div>  </div>
    82. 

  82. </div><!--header-->
    83. 

  83. <div class="contents">
    84. 

  84. 

  85. <p>These operate on vectors as vectors, not component-wise.  
    86. 

  86. <a href="#details">More...</a></p>
    87. 

  87. <table class="memberdecls">
    88. 

  88. <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
    89. 

  89. Functions</h2></td></tr>
    90. 

  90. <tr class="memitem:gaeeec0794212fe84fc9d261de067c9587"><td class="memTemplParams" colspan="2">template&lt;typename T , qualifier Q&gt; </td></tr>
    91. 

  91. <tr class="memitem:gaeeec0794212fe84fc9d261de067c9587"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL vec&lt; 3, T, Q &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00279.html#gaeeec0794212fe84fc9d261de067c9587">cross</a> (vec&lt; 3, T, Q &gt; const &amp;x, vec&lt; 3, T, Q &gt; const &amp;y)</td></tr>
    92. 

  92. <tr class="memdesc:gaeeec0794212fe84fc9d261de067c9587"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns the cross product of x and y.  <a href="a00279.html#gaeeec0794212fe84fc9d261de067c9587">More...</a><br /></td></tr>
    93. 

  93. <tr class="separator:gaeeec0794212fe84fc9d261de067c9587"><td class="memSeparator" colspan="2">&#160;</td></tr>
    94. 

  94. <tr class="memitem:gaa68de6c53e20dfb2dac2d20197562e3f"><td class="memTemplParams" colspan="2">template&lt;length_t L, typename T , qualifier Q&gt; </td></tr>
    95. 

  95. <tr class="memitem:gaa68de6c53e20dfb2dac2d20197562e3f"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL T&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00279.html#gaa68de6c53e20dfb2dac2d20197562e3f">distance</a> (vec&lt; L, T, Q &gt; const &amp;p0, vec&lt; L, T, Q &gt; const &amp;p1)</td></tr>
    96. 

  96. <tr class="memdesc:gaa68de6c53e20dfb2dac2d20197562e3f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns the distance betwwen p0 and p1, i.e., length(p0 - p1).  <a href="a00279.html#gaa68de6c53e20dfb2dac2d20197562e3f">More...</a><br /></td></tr>
    97. 

  97. <tr class="separator:gaa68de6c53e20dfb2dac2d20197562e3f"><td class="memSeparator" colspan="2">&#160;</td></tr>
    98. 

  98. <tr class="memitem:gaad6c5d9d39bdc0bf43baf1b22e147a0a"><td class="memTemplParams" colspan="2">template&lt;length_t L, typename T , qualifier Q&gt; </td></tr>
    99. 

  99. <tr class="memitem:gaad6c5d9d39bdc0bf43baf1b22e147a0a"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL T&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00279.html#gaad6c5d9d39bdc0bf43baf1b22e147a0a">dot</a> (vec&lt; L, T, Q &gt; const &amp;x, vec&lt; L, T, Q &gt; const &amp;y)</td></tr>
    100. 

  100. <tr class="memdesc:gaad6c5d9d39bdc0bf43baf1b22e147a0a"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns the dot product of x and y, i.e., result = x * y.  <a href="a00279.html#gaad6c5d9d39bdc0bf43baf1b22e147a0a">More...</a><br /></td></tr>
    101. 

  101. <tr class="separator:gaad6c5d9d39bdc0bf43baf1b22e147a0a"><td class="memSeparator" colspan="2">&#160;</td></tr>
    102. 

  102. <tr class="memitem:ga7aed0a36c738169402404a3a5d54e43b"><td class="memTemplParams" colspan="2">template&lt;length_t L, typename T , qualifier Q&gt; </td></tr>
    103. 

  103. <tr class="memitem:ga7aed0a36c738169402404a3a5d54e43b"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL vec&lt; L, T, Q &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00279.html#ga7aed0a36c738169402404a3a5d54e43b">faceforward</a> (vec&lt; L, T, Q &gt; const &amp;N, vec&lt; L, T, Q &gt; const &amp;I, vec&lt; L, T, Q &gt; const &amp;Nref)</td></tr>
    104. 

  104. <tr class="memdesc:ga7aed0a36c738169402404a3a5d54e43b"><td class="mdescLeft">&#160;</td><td class="mdescRight">If dot(Nref, I) &lt; 0.0, return N, otherwise, return -N.  <a href="a00279.html#ga7aed0a36c738169402404a3a5d54e43b">More...</a><br /></td></tr>
    105. 

  105. <tr class="separator:ga7aed0a36c738169402404a3a5d54e43b"><td class="memSeparator" colspan="2">&#160;</td></tr>
    106. 

  106. <tr class="memitem:ga0cdabbb000834d994a1d6dc56f8f5263"><td class="memTemplParams" colspan="2">template&lt;length_t L, typename T , qualifier Q&gt; </td></tr>
    107. 

  107. <tr class="memitem:ga0cdabbb000834d994a1d6dc56f8f5263"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL T&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00279.html#ga0cdabbb000834d994a1d6dc56f8f5263">length</a> (vec&lt; L, T, Q &gt; const &amp;x)</td></tr>
    108. 

  108. <tr class="memdesc:ga0cdabbb000834d994a1d6dc56f8f5263"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns the length of x, i.e., sqrt(x * x).  <a href="a00279.html#ga0cdabbb000834d994a1d6dc56f8f5263">More...</a><br /></td></tr>
    109. 

  109. <tr class="separator:ga0cdabbb000834d994a1d6dc56f8f5263"><td class="memSeparator" colspan="2">&#160;</td></tr>
    110. 

  110. <tr class="memitem:ga3b8d3dcae77870781392ed2902cce597"><td class="memTemplParams" colspan="2">template&lt;length_t L, typename T , qualifier Q&gt; </td></tr>
    111. 

  111. <tr class="memitem:ga3b8d3dcae77870781392ed2902cce597"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL vec&lt; L, T, Q &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00279.html#ga3b8d3dcae77870781392ed2902cce597">normalize</a> (vec&lt; L, T, Q &gt; const &amp;x)</td></tr>
    112. 

  112. <tr class="memdesc:ga3b8d3dcae77870781392ed2902cce597"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns a vector in the same direction as x but with length of 1.  <a href="a00279.html#ga3b8d3dcae77870781392ed2902cce597">More...</a><br /></td></tr>
    113. 

  113. <tr class="separator:ga3b8d3dcae77870781392ed2902cce597"><td class="memSeparator" colspan="2">&#160;</td></tr>
    114. 

  114. <tr class="memitem:ga5631dd1d5618de5450b1ea3cf3e94905"><td class="memTemplParams" colspan="2">template&lt;length_t L, typename T , qualifier Q&gt; </td></tr>
    115. 

  115. <tr class="memitem:ga5631dd1d5618de5450b1ea3cf3e94905"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL vec&lt; L, T, Q &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00279.html#ga5631dd1d5618de5450b1ea3cf3e94905">reflect</a> (vec&lt; L, T, Q &gt; const &amp;I, vec&lt; L, T, Q &gt; const &amp;N)</td></tr>
    116. 

  116. <tr class="memdesc:ga5631dd1d5618de5450b1ea3cf3e94905"><td class="mdescLeft">&#160;</td><td class="mdescRight">For the incident vector I and surface orientation N, returns the reflection direction : result = I - 2.0 * dot(N, I) * N.  <a href="a00279.html#ga5631dd1d5618de5450b1ea3cf3e94905">More...</a><br /></td></tr>
    117. 

  117. <tr class="separator:ga5631dd1d5618de5450b1ea3cf3e94905"><td class="memSeparator" colspan="2">&#160;</td></tr>
    118. 

  118. <tr class="memitem:ga01da3dff9e2ef6b9d4915c3047e22b74"><td class="memTemplParams" colspan="2">template&lt;length_t L, typename T , qualifier Q&gt; </td></tr>
    119. 

  119. <tr class="memitem:ga01da3dff9e2ef6b9d4915c3047e22b74"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL vec&lt; L, T, Q &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00279.html#ga01da3dff9e2ef6b9d4915c3047e22b74">refract</a> (vec&lt; L, T, Q &gt; const &amp;I, vec&lt; L, T, Q &gt; const &amp;N, T eta)</td></tr>
    120. 

  120. <tr class="memdesc:ga01da3dff9e2ef6b9d4915c3047e22b74"><td class="mdescLeft">&#160;</td><td class="mdescRight">For the incident vector I and surface normal N, and the ratio of indices of refraction eta, return the refraction vector.  <a href="a00279.html#ga01da3dff9e2ef6b9d4915c3047e22b74">More...</a><br /></td></tr>
    121. 

  121. <tr class="separator:ga01da3dff9e2ef6b9d4915c3047e22b74"><td class="memSeparator" colspan="2">&#160;</td></tr>
    122. 

  122. </table>
    123. 

  123. <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
    124. 

  124. <p>These operate on vectors as vectors, not component-wise. </p>
    125. 

  125. <p>Include &lt;<a class="el" href="a00036.html" title="Core features ">glm/geometric.hpp</a>&gt; to use these core features. </p>
    126. 

  126. <h2 class="groupheader">Function Documentation</h2>
    127. 

  127. <a class="anchor" id="gaeeec0794212fe84fc9d261de067c9587"></a>
    128. 

  128. <div class="memitem">
    129. 

  129. <div class="memproto">
    130. 

  130.       <table class="memname">
    131. 

  131.         <tr>
    132. 

  132.           <td class="memname">GLM_FUNC_DECL vec&lt;3, T, Q&gt; glm::cross </td>
    133. 

  133.           <td>(</td>
    134. 

  134.           <td class="paramtype">vec&lt; 3, T, Q &gt; const &amp;&#160;</td>
    135. 

  135.           <td class="paramname"><em>x</em>, </td>
    136. 

  136.         </tr>
    137. 

  137.         <tr>
    138. 

  138.           <td class="paramkey"></td>
    139. 

  139.           <td></td>
    140. 

  140.           <td class="paramtype">vec&lt; 3, T, Q &gt; const &amp;&#160;</td>
    141. 

  141.           <td class="paramname"><em>y</em>&#160;</td>
    142. 

  142.         </tr>
    143. 

  143.         <tr>
    144. 

  144.           <td></td>
    145. 

  145.           <td>)</td>
    146. 

  146.           <td></td><td></td>
    147. 

  147.         </tr>
    148. 

  148.       </table>
    149. 

  149. </div><div class="memdoc">
    150. 

  150. 

  151. <p>Returns the cross product of x and y. </p>
    152. 

  152. <dl class="tparams"><dt>Template Parameters</dt><dd>
    153. 

  153.   <table class="tparams">
    154. 

  154.     <tr><td class="paramname">T</td><td>Floating-point scalar types.</td></tr>
    155. 

  155.   </table>
    156. 

  156.   </dd>
    157. 

  157. </dl>
    158. 

  158. <dl class="section see"><dt>See also</dt><dd><a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/cross.xml">GLSL cross man page</a> </dd>
    159. 

  159. <dd>
    160. 

  160. <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a> </dd></dl>
    161. 

  161. 

  162. </div>
    163. 

  163. </div>
    164. 

  164. <a class="anchor" id="gaa68de6c53e20dfb2dac2d20197562e3f"></a>
    165. 

  165. <div class="memitem">
    166. 

  166. <div class="memproto">
    167. 

  167.       <table class="memname">
    168. 

  168.         <tr>
    169. 

  169.           <td class="memname">GLM_FUNC_DECL T glm::distance </td>
    170. 

  170.           <td>(</td>
    171. 

  171.           <td class="paramtype">vec&lt; L, T, Q &gt; const &amp;&#160;</td>
    172. 

  172.           <td class="paramname"><em>p0</em>, </td>
    173. 

  173.         </tr>
    174. 

  174.         <tr>
    175. 

  175.           <td class="paramkey"></td>
    176. 

  176.           <td></td>
    177. 

  177.           <td class="paramtype">vec&lt; L, T, Q &gt; const &amp;&#160;</td>
    178. 

  178.           <td class="paramname"><em>p1</em>&#160;</td>
    179. 

  179.         </tr>
    180. 

  180.         <tr>
    181. 

  181.           <td></td>
    182. 

  182.           <td>)</td>
    183. 

  183.           <td></td><td></td>
    184. 

  184.         </tr>
    185. 

  185.       </table>
    186. 

  186. </div><div class="memdoc">
    187. 

  187. 

  188. <p>Returns the distance betwwen p0 and p1, i.e., length(p0 - p1). </p>
    189. 

  189. <dl class="tparams"><dt>Template Parameters</dt><dd>
    190. 

  190.   <table class="tparams">
    191. 

  191.     <tr><td class="paramname">L</td><td>An integer between 1 and 4 included that qualify the dimension of the vector. </td></tr>
    192. 

  192.     <tr><td class="paramname">T</td><td>Floating-point scalar types.</td></tr>
    193. 

  193.   </table>
    194. 

  194.   </dd>
    195. 

  195. </dl>
    196. 

  196. <dl class="section see"><dt>See also</dt><dd><a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/distance.xml">GLSL distance man page</a> </dd>
    197. 

  197. <dd>
    198. 

  198. <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a> </dd></dl>
    199. 

  199. 

  200. </div>
    201. 

  201. </div>
    202. 

  202. <a class="anchor" id="gaad6c5d9d39bdc0bf43baf1b22e147a0a"></a>
    203. 

  203. <div class="memitem">
    204. 

  204. <div class="memproto">
    205. 

  205.       <table class="memname">
    206. 

  206.         <tr>
    207. 

  207.           <td class="memname">GLM_FUNC_DECL T glm::dot </td>
    208. 

  208.           <td>(</td>
    209. 

  209.           <td class="paramtype">vec&lt; L, T, Q &gt; const &amp;&#160;</td>
    210. 

  210.           <td class="paramname"><em>x</em>, </td>
    211. 

  211.         </tr>
    212. 

  212.         <tr>
    213. 

  213.           <td class="paramkey"></td>
    214. 

  214.           <td></td>
    215. 

  215.           <td class="paramtype">vec&lt; L, T, Q &gt; const &amp;&#160;</td>
    216. 

  216.           <td class="paramname"><em>y</em>&#160;</td>
    217. 

  217.         </tr>
    218. 

  218.         <tr>
    219. 

  219.           <td></td>
    220. 

  220.           <td>)</td>
    221. 

  221.           <td></td><td></td>
    222. 

  222.         </tr>
    223. 

  223.       </table>
    224. 

  224. </div><div class="memdoc">
    225. 

  225. 

  226. <p>Returns the dot product of x and y, i.e., result = x * y. </p>
    227. 

  227. <dl class="tparams"><dt>Template Parameters</dt><dd>
    228. 

  228.   <table class="tparams">
    229. 

  229.     <tr><td class="paramname">L</td><td>An integer between 1 and 4 included that qualify the dimension of the vector. </td></tr>
    230. 

  230.     <tr><td class="paramname">T</td><td>Floating-point scalar types.</td></tr>
    231. 

  231.   </table>
    232. 

  232.   </dd>
    233. 

  233. </dl>
    234. 

  234. <dl class="section see"><dt>See also</dt><dd><a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/dot.xml">GLSL dot man page</a> </dd>
    235. 

  235. <dd>
    236. 

  236. <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a> </dd></dl>
    237. 

  237. 

  238. </div>
    239. 

  239. </div>
    240. 

  240. <a class="anchor" id="ga7aed0a36c738169402404a3a5d54e43b"></a>
    241. 

  241. <div class="memitem">
    242. 

  242. <div class="memproto">
    243. 

  243.       <table class="memname">
    244. 

  244.         <tr>
    245. 

  245.           <td class="memname">GLM_FUNC_DECL vec&lt;L, T, Q&gt; glm::faceforward </td>
    246. 

  246.           <td>(</td>
    247. 

  247.           <td class="paramtype">vec&lt; L, T, Q &gt; const &amp;&#160;</td>
    248. 

  248.           <td class="paramname"><em>N</em>, </td>
    249. 

  249.         </tr>
    250. 

  250.         <tr>
    251. 

  251.           <td class="paramkey"></td>
    252. 

  252.           <td></td>
    253. 

  253.           <td class="paramtype">vec&lt; L, T, Q &gt; const &amp;&#160;</td>
    254. 

  254.           <td class="paramname"><em>I</em>, </td>
    255. 

  255.         </tr>
    256. 

  256.         <tr>
    257. 

  257.           <td class="paramkey"></td>
    258. 

  258.           <td></td>
    259. 

  259.           <td class="paramtype">vec&lt; L, T, Q &gt; const &amp;&#160;</td>
    260. 

  260.           <td class="paramname"><em>Nref</em>&#160;</td>
    261. 

  261.         </tr>
    262. 

  262.         <tr>
    263. 

  263.           <td></td>
    264. 

  264.           <td>)</td>
    265. 

  265.           <td></td><td></td>
    266. 

  266.         </tr>
    267. 

  267.       </table>
    268. 

  268. </div><div class="memdoc">
    269. 

  269. 

  270. <p>If dot(Nref, I) &lt; 0.0, return N, otherwise, return -N. </p>
    271. 

  271. <dl class="tparams"><dt>Template Parameters</dt><dd>
    272. 

  272.   <table class="tparams">
    273. 

  273.     <tr><td class="paramname">L</td><td>An integer between 1 and 4 included that qualify the dimension of the vector. </td></tr>
    274. 

  274.     <tr><td class="paramname">T</td><td>Floating-point scalar types.</td></tr>
    275. 

  275.   </table>
    276. 

  276.   </dd>
    277. 

  277. </dl>
    278. 

  278. <dl class="section see"><dt>See also</dt><dd><a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/faceforward.xml">GLSL faceforward man page</a> </dd>
    279. 

  279. <dd>
    280. 

  280. <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a> </dd></dl>
    281. 

  281. 

  282. </div>
    283. 

  283. </div>
    284. 

  284. <a class="anchor" id="ga0cdabbb000834d994a1d6dc56f8f5263"></a>
    285. 

  285. <div class="memitem">
    286. 

  286. <div class="memproto">
    287. 

  287.       <table class="memname">
    288. 

  288.         <tr>
    289. 

  289.           <td class="memname">GLM_FUNC_DECL T glm::length </td>
    290. 

  290.           <td>(</td>
    291. 

  291.           <td class="paramtype">vec&lt; L, T, Q &gt; const &amp;&#160;</td>
    292. 

  292.           <td class="paramname"><em>x</em></td><td>)</td>
    293. 

  293.           <td></td>
    294. 

  294.         </tr>
    295. 

  295.       </table>
    296. 

  296. </div><div class="memdoc">
    297. 

  297. 

  298. <p>Returns the length of x, i.e., sqrt(x * x). </p>
    299. 

  299. <dl class="tparams"><dt>Template Parameters</dt><dd>
    300. 

  300.   <table class="tparams">
    301. 

  301.     <tr><td class="paramname">L</td><td>An integer between 1 and 4 included that qualify the dimension of the vector. </td></tr>
    302. 

  302.     <tr><td class="paramname">T</td><td>Floating-point scalar types.</td></tr>
    303. 

  303.   </table>
    304. 

  304.   </dd>
    305. 

  305. </dl>
    306. 

  306. <dl class="section see"><dt>See also</dt><dd><a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/length.xml">GLSL length man page</a> </dd>
    307. 

  307. <dd>
    308. 

  308. <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a> </dd></dl>
    309. 

  309. 

  310. </div>
    311. 

  311. </div>
    312. 

  312. <a class="anchor" id="ga3b8d3dcae77870781392ed2902cce597"></a>
    313. 

  313. <div class="memitem">
    314. 

  314. <div class="memproto">
    315. 

  315.       <table class="memname">
    316. 

  316.         <tr>
    317. 

  317.           <td class="memname">GLM_FUNC_DECL vec&lt;L, T, Q&gt; glm::normalize </td>
    318. 

  318.           <td>(</td>
    319. 

  319.           <td class="paramtype">vec&lt; L, T, Q &gt; const &amp;&#160;</td>
    320. 

  320.           <td class="paramname"><em>x</em></td><td>)</td>
    321. 

  321.           <td></td>
    322. 

  322.         </tr>
    323. 

  323.       </table>
    324. 

  324. </div><div class="memdoc">
    325. 

  325. 

  326. <p>Returns a vector in the same direction as x but with length of 1. </p>
    327. 

  327. <p>According to issue 10 GLSL 1.10 specification, if length(x) == 0 then result is undefined and generate an error.</p>
    328. 

  328. <dl class="tparams"><dt>Template Parameters</dt><dd>
    329. 

  329.   <table class="tparams">
    330. 

  330.     <tr><td class="paramname">L</td><td>An integer between 1 and 4 included that qualify the dimension of the vector. </td></tr>
    331. 

  331.     <tr><td class="paramname">T</td><td>Floating-point scalar types.</td></tr>
    332. 

  332.   </table>
    333. 

  333.   </dd>
    334. 

  334. </dl>
    335. 

  335. <dl class="section see"><dt>See also</dt><dd><a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/normalize.xml">GLSL normalize man page</a> </dd>
    336. 

  336. <dd>
    337. 

  337. <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a> </dd></dl>
    338. 

  338. 

  339. </div>
    340. 

  340. </div>
    341. 

  341. <a class="anchor" id="ga5631dd1d5618de5450b1ea3cf3e94905"></a>
    342. 

  342. <div class="memitem">
    343. 

  343. <div class="memproto">
    344. 

  344.       <table class="memname">
    345. 

  345.         <tr>
    346. 

  346.           <td class="memname">GLM_FUNC_DECL vec&lt;L, T, Q&gt; glm::reflect </td>
    347. 

  347.           <td>(</td>
    348. 

  348.           <td class="paramtype">vec&lt; L, T, Q &gt; const &amp;&#160;</td>
    349. 

  349.           <td class="paramname"><em>I</em>, </td>
    350. 

  350.         </tr>
    351. 

  351.         <tr>
    352. 

  352.           <td class="paramkey"></td>
    353. 

  353.           <td></td>
    354. 

  354.           <td class="paramtype">vec&lt; L, T, Q &gt; const &amp;&#160;</td>
    355. 

  355.           <td class="paramname"><em>N</em>&#160;</td>
    356. 

  356.         </tr>
    357. 

  357.         <tr>
    358. 

  358.           <td></td>
    359. 

  359.           <td>)</td>
    360. 

  360.           <td></td><td></td>
    361. 

  361.         </tr>
    362. 

  362.       </table>
    363. 

  363. </div><div class="memdoc">
    364. 

  364. 

  365. <p>For the incident vector I and surface orientation N, returns the reflection direction : result = I - 2.0 * dot(N, I) * N. </p>
    366. 

  366. <dl class="tparams"><dt>Template Parameters</dt><dd>
    367. 

  367.   <table class="tparams">
    368. 

  368.     <tr><td class="paramname">L</td><td>An integer between 1 and 4 included that qualify the dimension of the vector. </td></tr>
    369. 

  369.     <tr><td class="paramname">T</td><td>Floating-point scalar types.</td></tr>
    370. 

  370.   </table>
    371. 

  371.   </dd>
    372. 

  372. </dl>
    373. 

  373. <dl class="section see"><dt>See also</dt><dd><a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/reflect.xml">GLSL reflect man page</a> </dd>
    374. 

  374. <dd>
    375. 

  375. <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a> </dd></dl>
    376. 

  376. 

  377. </div>
    378. 

  378. </div>
    379. 

  379. <a class="anchor" id="ga01da3dff9e2ef6b9d4915c3047e22b74"></a>
    380. 

  380. <div class="memitem">
    381. 

  381. <div class="memproto">
    382. 

  382.       <table class="memname">
    383. 

  383.         <tr>
    384. 

  384.           <td class="memname">GLM_FUNC_DECL vec&lt;L, T, Q&gt; glm::refract </td>
    385. 

  385.           <td>(</td>
    386. 

  386.           <td class="paramtype">vec&lt; L, T, Q &gt; const &amp;&#160;</td>
    387. 

  387.           <td class="paramname"><em>I</em>, </td>
    388. 

  388.         </tr>
    389. 

  389.         <tr>
    390. 

  390.           <td class="paramkey"></td>
    391. 

  391.           <td></td>
    392. 

  392.           <td class="paramtype">vec&lt; L, T, Q &gt; const &amp;&#160;</td>
    393. 

  393.           <td class="paramname"><em>N</em>, </td>
    394. 

  394.         </tr>
    395. 

  395.         <tr>
    396. 

  396.           <td class="paramkey"></td>
    397. 

  397.           <td></td>
    398. 

  398.           <td class="paramtype">T&#160;</td>
    399. 

  399.           <td class="paramname"><em>eta</em>&#160;</td>
    400. 

  400.         </tr>
    401. 

  401.         <tr>
    402. 

  402.           <td></td>
    403. 

  403.           <td>)</td>
    404. 

  404.           <td></td><td></td>
    405. 

  405.         </tr>
    406. 

  406.       </table>
    407. 

  407. </div><div class="memdoc">
    408. 

  408. 

  409. <p>For the incident vector I and surface normal N, and the ratio of indices of refraction eta, return the refraction vector. </p>
    410. 

  410. <dl class="tparams"><dt>Template Parameters</dt><dd>
    411. 

  411.   <table class="tparams">
    412. 

  412.     <tr><td class="paramname">L</td><td>An integer between 1 and 4 included that qualify the dimension of the vector. </td></tr>
    413. 

  413.     <tr><td class="paramname">T</td><td>Floating-point scalar types.</td></tr>
    414. 

  414.   </table>
    415. 

  415.   </dd>
    416. 

  416. </dl>
    417. 

  417. <dl class="section see"><dt>See also</dt><dd><a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/refract.xml">GLSL refract man page</a> </dd>
    418. 

  418. <dd>
    419. 

  419. <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a> </dd></dl>
    420. 

  420. 

  421. </div>
    422. 

  422. </div>
    423. 

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    424. 

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    426. 

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    432.