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  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="a00155.html">GLM Core</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:gafe2cae8cb26fd44be62aee97369d0af8"><td class="memTemplParams" colspan="2">template&lt;typename T , precision P&gt; </td></tr>
    91. 

  91. <tr class="memitem:gafe2cae8cb26fd44be62aee97369d0af8"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL tvec3&lt; T, P &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00147.html#gafe2cae8cb26fd44be62aee97369d0af8">cross</a> (tvec3&lt; T, P &gt; const &amp;x, tvec3&lt; T, P &gt; const &amp;y)</td></tr>
    92. 

  92. <tr class="memdesc:gafe2cae8cb26fd44be62aee97369d0af8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns the cross product of x and y.  <a href="a00147.html#gafe2cae8cb26fd44be62aee97369d0af8">More...</a><br /></td></tr>
    93. 

  93. <tr class="separator:gafe2cae8cb26fd44be62aee97369d0af8"><td class="memSeparator" colspan="2">&#160;</td></tr>
    94. 

  94. <tr class="memitem:ga7ca317dde0d7e94d920153554d4a02a8"><td class="memTemplParams" colspan="2">template&lt;typename T , precision P, template&lt; typename, precision &gt; class vecType&gt; </td></tr>
    95. 

  95. <tr class="memitem:ga7ca317dde0d7e94d920153554d4a02a8"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL T&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00147.html#ga7ca317dde0d7e94d920153554d4a02a8">distance</a> (vecType&lt; T, P &gt; const &amp;p0, vecType&lt; T, P &gt; const &amp;p1)</td></tr>
    96. 

  96. <tr class="memdesc:ga7ca317dde0d7e94d920153554d4a02a8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns the distance betwwen p0 and p1, i.e., length(p0 - p1).  <a href="a00147.html#ga7ca317dde0d7e94d920153554d4a02a8">More...</a><br /></td></tr>
    97. 

  97. <tr class="separator:ga7ca317dde0d7e94d920153554d4a02a8"><td class="memSeparator" colspan="2">&#160;</td></tr>
    98. 

  98. <tr class="memitem:ga7dada304da2ba7dd3376ab4f178c3f6b"><td class="memTemplParams" colspan="2">template&lt;typename T , precision P, template&lt; typename, precision &gt; class vecType&gt; </td></tr>
    99. 

  99. <tr class="memitem:ga7dada304da2ba7dd3376ab4f178c3f6b"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL T&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00147.html#ga7dada304da2ba7dd3376ab4f178c3f6b">dot</a> (vecType&lt; T, P &gt; const &amp;x, vecType&lt; T, P &gt; const &amp;y)</td></tr>
    100. 

  100. <tr class="memdesc:ga7dada304da2ba7dd3376ab4f178c3f6b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns the dot product of x and y, i.e., result = x * y.  <a href="a00147.html#ga7dada304da2ba7dd3376ab4f178c3f6b">More...</a><br /></td></tr>
    101. 

  101. <tr class="separator:ga7dada304da2ba7dd3376ab4f178c3f6b"><td class="memSeparator" colspan="2">&#160;</td></tr>
    102. 

  102. <tr class="memitem:gaea854e5aec1b5839832ac2dfc7cd3c0d"><td class="memTemplParams" colspan="2">template&lt;typename T , precision P, template&lt; typename, precision &gt; class vecType&gt; </td></tr>
    103. 

  103. <tr class="memitem:gaea854e5aec1b5839832ac2dfc7cd3c0d"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL vecType&lt; T, P &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00147.html#gaea854e5aec1b5839832ac2dfc7cd3c0d">faceforward</a> (vecType&lt; T, P &gt; const &amp;N, vecType&lt; T, P &gt; const &amp;I, vecType&lt; T, P &gt; const &amp;Nref)</td></tr>
    104. 

  104. <tr class="memdesc:gaea854e5aec1b5839832ac2dfc7cd3c0d"><td class="mdescLeft">&#160;</td><td class="mdescRight">If dot(Nref, I) &lt; 0.0, return N, otherwise, return -N.  <a href="a00147.html#gaea854e5aec1b5839832ac2dfc7cd3c0d">More...</a><br /></td></tr>
    105. 

  105. <tr class="separator:gaea854e5aec1b5839832ac2dfc7cd3c0d"><td class="memSeparator" colspan="2">&#160;</td></tr>
    106. 

  106. <tr class="memitem:ga18d45e3d4c7705e67ccfabd99e521604"><td class="memTemplParams" colspan="2">template&lt;typename T , precision P, template&lt; typename, precision &gt; class vecType&gt; </td></tr>
    107. 

  107. <tr class="memitem:ga18d45e3d4c7705e67ccfabd99e521604"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL T&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00147.html#ga18d45e3d4c7705e67ccfabd99e521604">length</a> (vecType&lt; T, P &gt; const &amp;x)</td></tr>
    108. 

  108. <tr class="memdesc:ga18d45e3d4c7705e67ccfabd99e521604"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns the length of x, i.e., sqrt(x * x).  <a href="a00147.html#ga18d45e3d4c7705e67ccfabd99e521604">More...</a><br /></td></tr>
    109. 

  109. <tr class="separator:ga18d45e3d4c7705e67ccfabd99e521604"><td class="memSeparator" colspan="2">&#160;</td></tr>
    110. 

  110. <tr class="memitem:gada9451ec170a36fe53552812b9c03a68"><td class="memTemplParams" colspan="2">template&lt;typename T , precision P, template&lt; typename, precision &gt; class vecType&gt; </td></tr>
    111. 

  111. <tr class="memitem:gada9451ec170a36fe53552812b9c03a68"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL vecType&lt; T, P &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00147.html#gada9451ec170a36fe53552812b9c03a68">normalize</a> (vecType&lt; T, P &gt; const &amp;x)</td></tr>
    112. 

  112. <tr class="memdesc:gada9451ec170a36fe53552812b9c03a68"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns a vector in the same direction as x but with length of 1.  <a href="a00147.html#gada9451ec170a36fe53552812b9c03a68">More...</a><br /></td></tr>
    113. 

  113. <tr class="separator:gada9451ec170a36fe53552812b9c03a68"><td class="memSeparator" colspan="2">&#160;</td></tr>
    114. 

  114. <tr class="memitem:gab63646fc36b81cf69d3ce123a72f76f2"><td class="memTemplParams" colspan="2">template&lt;typename genType &gt; </td></tr>
    115. 

  115. <tr class="memitem:gab63646fc36b81cf69d3ce123a72f76f2"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL genType&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00147.html#gab63646fc36b81cf69d3ce123a72f76f2">reflect</a> (genType const &amp;I, genType const &amp;N)</td></tr>
    116. 

  116. <tr class="memdesc:gab63646fc36b81cf69d3ce123a72f76f2"><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="a00147.html#gab63646fc36b81cf69d3ce123a72f76f2">More...</a><br /></td></tr>
    117. 

  117. <tr class="separator:gab63646fc36b81cf69d3ce123a72f76f2"><td class="memSeparator" colspan="2">&#160;</td></tr>
    118. 

  118. <tr class="memitem:gab7e7cdf4403931a5f7b74560ad64159b"><td class="memTemplParams" colspan="2">template&lt;typename T , precision P, template&lt; typename, precision &gt; class vecType&gt; </td></tr>
    119. 

  119. <tr class="memitem:gab7e7cdf4403931a5f7b74560ad64159b"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL vecType&lt; T, P &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00147.html#gab7e7cdf4403931a5f7b74560ad64159b">refract</a> (vecType&lt; T, P &gt; const &amp;I, vecType&lt; T, P &gt; const &amp;N, T eta)</td></tr>
    120. 

  120. <tr class="memdesc:gab7e7cdf4403931a5f7b74560ad64159b"><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="a00147.html#gab7e7cdf4403931a5f7b74560ad64159b">More...</a><br /></td></tr>
    121. 

  121. <tr class="separator:gab7e7cdf4403931a5f7b74560ad64159b"><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. <h2 class="groupheader">Function Documentation</h2>
    126. 

  126. <a class="anchor" id="gafe2cae8cb26fd44be62aee97369d0af8"></a>
    127. 

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

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

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

  130.         <tr>
    131. 

  131.           <td class="memname">GLM_FUNC_DECL tvec3&lt;T, P&gt; glm::cross </td>
    132. 

  132.           <td>(</td>
    133. 

  133.           <td class="paramtype">tvec3&lt; T, P &gt; const &amp;&#160;</td>
    134. 

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

  135.         </tr>
    136. 

  136.         <tr>
    137. 

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

  138.           <td></td>
    139. 

  139.           <td class="paramtype">tvec3&lt; T, P &gt; const &amp;&#160;</td>
    140. 

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

  141.         </tr>
    142. 

  142.         <tr>
    143. 

  143.           <td></td>
    144. 

  144.           <td>)</td>
    145. 

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

  146.         </tr>
    147. 

  147.       </table>
    148. 

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

  149. 

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

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

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

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

  154.   </table>
    155. 

  155.   </dd>
    156. 

  156. </dl>
    157. 

  157. <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>
    158. 

  158. <dd>
    159. 

  159. <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>
    160. 

  160. 

  161. </div>
    162. 

  162. </div>
    163. 

  163. <a class="anchor" id="ga7ca317dde0d7e94d920153554d4a02a8"></a>
    164. 

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

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

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

  167.         <tr>
    168. 

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

  169.           <td>(</td>
    170. 

  170.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    171. 

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

  172.         </tr>
    173. 

  173.         <tr>
    174. 

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

  175.           <td></td>
    176. 

  176.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    177. 

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

  178.         </tr>
    179. 

  179.         <tr>
    180. 

  180.           <td></td>
    181. 

  181.           <td>)</td>
    182. 

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

  183.         </tr>
    184. 

  184.       </table>
    185. 

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

  186. 

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

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

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

  190.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    191. 

  191.   </table>
    192. 

  192.   </dd>
    193. 

  193. </dl>
    194. 

  194. <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>
    195. 

  195. <dd>
    196. 

  196. <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>
    197. 

  197. 

  198. </div>
    199. 

  199. </div>
    200. 

  200. <a class="anchor" id="ga7dada304da2ba7dd3376ab4f178c3f6b"></a>
    201. 

  201. <div class="memitem">
    202. 

  202. <div class="memproto">
    203. 

  203.       <table class="memname">
    204. 

  204.         <tr>
    205. 

  205.           <td class="memname">GLM_FUNC_DECL T glm::dot </td>
    206. 

  206.           <td>(</td>
    207. 

  207.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    208. 

  208.           <td class="paramname"><em>x</em>, </td>
    209. 

  209.         </tr>
    210. 

  210.         <tr>
    211. 

  211.           <td class="paramkey"></td>
    212. 

  212.           <td></td>
    213. 

  213.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    214. 

  214.           <td class="paramname"><em>y</em>&#160;</td>
    215. 

  215.         </tr>
    216. 

  216.         <tr>
    217. 

  217.           <td></td>
    218. 

  218.           <td>)</td>
    219. 

  219.           <td></td><td></td>
    220. 

  220.         </tr>
    221. 

  221.       </table>
    222. 

  222. </div><div class="memdoc">
    223. 

  223. 

  224. <p>Returns the dot product of x and y, i.e., result = x * y. </p>
    225. 

  225. <dl class="tparams"><dt>Template Parameters</dt><dd>
    226. 

  226.   <table class="tparams">
    227. 

  227.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    228. 

  228.   </table>
    229. 

  229.   </dd>
    230. 

  230. </dl>
    231. 

  231. <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>
    232. 

  232. <dd>
    233. 

  233. <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>
    234. 

  234. 

  235. </div>
    236. 

  236. </div>
    237. 

  237. <a class="anchor" id="gaea854e5aec1b5839832ac2dfc7cd3c0d"></a>
    238. 

  238. <div class="memitem">
    239. 

  239. <div class="memproto">
    240. 

  240.       <table class="memname">
    241. 

  241.         <tr>
    242. 

  242.           <td class="memname">GLM_FUNC_DECL vecType&lt;T, P&gt; glm::faceforward </td>
    243. 

  243.           <td>(</td>
    244. 

  244.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    245. 

  245.           <td class="paramname"><em>N</em>, </td>
    246. 

  246.         </tr>
    247. 

  247.         <tr>
    248. 

  248.           <td class="paramkey"></td>
    249. 

  249.           <td></td>
    250. 

  250.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    251. 

  251.           <td class="paramname"><em>I</em>, </td>
    252. 

  252.         </tr>
    253. 

  253.         <tr>
    254. 

  254.           <td class="paramkey"></td>
    255. 

  255.           <td></td>
    256. 

  256.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    257. 

  257.           <td class="paramname"><em>Nref</em>&#160;</td>
    258. 

  258.         </tr>
    259. 

  259.         <tr>
    260. 

  260.           <td></td>
    261. 

  261.           <td>)</td>
    262. 

  262.           <td></td><td></td>
    263. 

  263.         </tr>
    264. 

  264.       </table>
    265. 

  265. </div><div class="memdoc">
    266. 

  266. 

  267. <p>If dot(Nref, I) &lt; 0.0, return N, otherwise, return -N. </p>
    268. 

  268. <dl class="tparams"><dt>Template Parameters</dt><dd>
    269. 

  269.   <table class="tparams">
    270. 

  270.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    271. 

  271.   </table>
    272. 

  272.   </dd>
    273. 

  273. </dl>
    274. 

  274. <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>
    275. 

  275. <dd>
    276. 

  276. <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>
    277. 

  277. 

  278. </div>
    279. 

  279. </div>
    280. 

  280. <a class="anchor" id="ga18d45e3d4c7705e67ccfabd99e521604"></a>
    281. 

  281. <div class="memitem">
    282. 

  282. <div class="memproto">
    283. 

  283.       <table class="memname">
    284. 

  284.         <tr>
    285. 

  285.           <td class="memname">GLM_FUNC_DECL T glm::length </td>
    286. 

  286.           <td>(</td>
    287. 

  287.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    288. 

  288.           <td class="paramname"><em>x</em></td><td>)</td>
    289. 

  289.           <td></td>
    290. 

  290.         </tr>
    291. 

  291.       </table>
    292. 

  292. </div><div class="memdoc">
    293. 

  293. 

  294. <p>Returns the length of x, i.e., sqrt(x * x). </p>
    295. 

  295. <dl class="tparams"><dt>Template Parameters</dt><dd>
    296. 

  296.   <table class="tparams">
    297. 

  297.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    298. 

  298.   </table>
    299. 

  299.   </dd>
    300. 

  300. </dl>
    301. 

  301. <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>
    302. 

  302. <dd>
    303. 

  303. <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>
    304. 

  304. 

  305. </div>
    306. 

  306. </div>
    307. 

  307. <a class="anchor" id="gada9451ec170a36fe53552812b9c03a68"></a>
    308. 

  308. <div class="memitem">
    309. 

  309. <div class="memproto">
    310. 

  310.       <table class="memname">
    311. 

  311.         <tr>
    312. 

  312.           <td class="memname">GLM_FUNC_DECL vecType&lt;T, P&gt; glm::normalize </td>
    313. 

  313.           <td>(</td>
    314. 

  314.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    315. 

  315.           <td class="paramname"><em>x</em></td><td>)</td>
    316. 

  316.           <td></td>
    317. 

  317.         </tr>
    318. 

  318.       </table>
    319. 

  319. </div><div class="memdoc">
    320. 

  320. 

  321. <p>Returns a vector in the same direction as x but with length of 1. </p>
    322. 

  322. <p>According to issue 10 GLSL 1.10 specification, if length(x) == 0 then result is undefined and generate an error.</p>
    323. 

  323. <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>
    324. 

  324. <dd>
    325. 

  325. <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>
    326. 

  326. 

  327. </div>
    328. 

  328. </div>
    329. 

  329. <a class="anchor" id="gab63646fc36b81cf69d3ce123a72f76f2"></a>
    330. 

  330. <div class="memitem">
    331. 

  331. <div class="memproto">
    332. 

  332.       <table class="memname">
    333. 

  333.         <tr>
    334. 

  334.           <td class="memname">GLM_FUNC_DECL genType glm::reflect </td>
    335. 

  335.           <td>(</td>
    336. 

  336.           <td class="paramtype">genType const &amp;&#160;</td>
    337. 

  337.           <td class="paramname"><em>I</em>, </td>
    338. 

  338.         </tr>
    339. 

  339.         <tr>
    340. 

  340.           <td class="paramkey"></td>
    341. 

  341.           <td></td>
    342. 

  342.           <td class="paramtype">genType const &amp;&#160;</td>
    343. 

  343.           <td class="paramname"><em>N</em>&#160;</td>
    344. 

  344.         </tr>
    345. 

  345.         <tr>
    346. 

  346.           <td></td>
    347. 

  347.           <td>)</td>
    348. 

  348.           <td></td><td></td>
    349. 

  349.         </tr>
    350. 

  350.       </table>
    351. 

  351. </div><div class="memdoc">
    352. 

  352. 

  353. <p>For the incident vector I and surface orientation N, returns the reflection direction : result = I - 2.0 * dot(N, I) * N. </p>
    354. 

  354. <dl class="tparams"><dt>Template Parameters</dt><dd>
    355. 

  355.   <table class="tparams">
    356. 

  356.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    357. 

  357.   </table>
    358. 

  358.   </dd>
    359. 

  359. </dl>
    360. 

  360. <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>
    361. 

  361. <dd>
    362. 

  362. <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>
    363. 

  363. 

  364. </div>
    365. 

  365. </div>
    366. 

  366. <a class="anchor" id="gab7e7cdf4403931a5f7b74560ad64159b"></a>
    367. 

  367. <div class="memitem">
    368. 

  368. <div class="memproto">
    369. 

  369.       <table class="memname">
    370. 

  370.         <tr>
    371. 

  371.           <td class="memname">GLM_FUNC_DECL vecType&lt;T, P&gt; glm::refract </td>
    372. 

  372.           <td>(</td>
    373. 

  373.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    374. 

  374.           <td class="paramname"><em>I</em>, </td>
    375. 

  375.         </tr>
    376. 

  376.         <tr>
    377. 

  377.           <td class="paramkey"></td>
    378. 

  378.           <td></td>
    379. 

  379.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    380. 

  380.           <td class="paramname"><em>N</em>, </td>
    381. 

  381.         </tr>
    382. 

  382.         <tr>
    383. 

  383.           <td class="paramkey"></td>
    384. 

  384.           <td></td>
    385. 

  385.           <td class="paramtype">T&#160;</td>
    386. 

  386.           <td class="paramname"><em>eta</em>&#160;</td>
    387. 

  387.         </tr>
    388. 

  388.         <tr>
    389. 

  389.           <td></td>
    390. 

  390.           <td>)</td>
    391. 

  391.           <td></td><td></td>
    392. 

  392.         </tr>
    393. 

  393.       </table>
    394. 

  394. </div><div class="memdoc">
    395. 

  395. 

  396. <p>For the incident vector I and surface normal N, and the ratio of indices of refraction eta, return the refraction vector. </p>
    397. 

  397. <dl class="tparams"><dt>Template Parameters</dt><dd>
    398. 

  398.   <table class="tparams">
    399. 

  399.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    400. 

  400.   </table>
    401. 

  401.   </dd>
    402. 

  402. </dl>
    403. 

  403. <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>
    404. 

  404. <dd>
    405. 

  405. <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>
    406. 

  406. 

  407. </div>
    408. 

  408. </div>
    409. 

  409. </div><!-- contents -->
    410. 

  410. <!-- start footer part -->
    411. 

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    412. 

  412. Generated by &#160;<a href="http://www.doxygen.org/index.html">
    413. 

  413. <img class="footer" src="doxygen.png" alt="doxygen"/>
    414. 

  414. </a> 1.8.10
    415. 

  415. </small></address>
    416. 

  416. </body>
    417. 

  417. </html>
    418.