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    42. 

  42. <a href="#func-members">Functions</a>  </div>
    43. 

  43.   <div class="headertitle">
    44. 

  44. <div class="title">Geometric functions<div class="ingroups"><a class="el" href="a00167.html">GLM Core</a></div></div>  </div>
    45. 

  45. </div><!--header-->
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  46. <div class="contents">
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  47. <table class="memberdecls">
    48. 

  48. <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
    49. 

  49. Functions</h2></td></tr>
    50. 

  50. <tr class="memitem:ga89b91c2a256cfb62ecbc589d1ee36d3c"><td class="memTemplParams" colspan="2">template&lt;typename T , precision P&gt; </td></tr>
    51. 

  51. <tr class="memitem:ga89b91c2a256cfb62ecbc589d1ee36d3c"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL detail::tvec3&lt; T, P &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00157.html#ga89b91c2a256cfb62ecbc589d1ee36d3c">cross</a> (detail::tvec3&lt; T, P &gt; const &amp;x, detail::tvec3&lt; T, P &gt; const &amp;y)</td></tr>
    52. 

  52. <tr class="separator:ga89b91c2a256cfb62ecbc589d1ee36d3c"><td class="memSeparator" colspan="2">&#160;</td></tr>
    53. 

  53. <tr class="memitem:ga00716eae37e8ae2a76ca7799f9c75682"><td class="memTemplParams" colspan="2">template&lt;typename genType &gt; </td></tr>
    54. 

  54. <tr class="memitem:ga00716eae37e8ae2a76ca7799f9c75682"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL genType::value_type&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00157.html#ga00716eae37e8ae2a76ca7799f9c75682">distance</a> (genType const &amp;p0, genType const &amp;p1)</td></tr>
    55. 

  55. <tr class="separator:ga00716eae37e8ae2a76ca7799f9c75682"><td class="memSeparator" colspan="2">&#160;</td></tr>
    56. 

  56. <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>
    57. 

  57. <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="a00157.html#ga7dada304da2ba7dd3376ab4f178c3f6b">dot</a> (vecType&lt; T, P &gt; const &amp;x, vecType&lt; T, P &gt; const &amp;y)</td></tr>
    58. 

  58. <tr class="separator:ga7dada304da2ba7dd3376ab4f178c3f6b"><td class="memSeparator" colspan="2">&#160;</td></tr>
    59. 

  59. <tr class="memitem:gaef767c2b0678489cb9de7a534137a86d"><td class="memTemplParams" colspan="2">template&lt;typename genType &gt; </td></tr>
    60. 

  60. <tr class="memitem:gaef767c2b0678489cb9de7a534137a86d"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL genType&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00157.html#gaef767c2b0678489cb9de7a534137a86d">dot</a> (genType const &amp;x, genType const &amp;y)</td></tr>
    61. 

  61. <tr class="separator:gaef767c2b0678489cb9de7a534137a86d"><td class="memSeparator" colspan="2">&#160;</td></tr>
    62. 

  62. <tr class="memitem:ga4bbb036ef9527ee9f67384233029ed9b"><td class="memTemplParams" colspan="2">template&lt;typename genType &gt; </td></tr>
    63. 

  63. <tr class="memitem:ga4bbb036ef9527ee9f67384233029ed9b"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL genType&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00157.html#ga4bbb036ef9527ee9f67384233029ed9b">faceforward</a> (genType const &amp;N, genType const &amp;I, genType const &amp;Nref)</td></tr>
    64. 

  64. <tr class="separator:ga4bbb036ef9527ee9f67384233029ed9b"><td class="memSeparator" colspan="2">&#160;</td></tr>
    65. 

  65. <tr class="memitem:ga03b2831439defb8922832b540b91b8a7"><td class="memTemplParams" colspan="2">template&lt;typename genType &gt; </td></tr>
    66. 

  66. <tr class="memitem:ga03b2831439defb8922832b540b91b8a7"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL genType::value_type&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00157.html#ga03b2831439defb8922832b540b91b8a7">length</a> (genType const &amp;x)</td></tr>
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  67. <tr class="separator:ga03b2831439defb8922832b540b91b8a7"><td class="memSeparator" colspan="2">&#160;</td></tr>
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  68. <tr class="memitem:ga15aa87101457e41663b08a8dcc3357f8"><td class="memTemplParams" colspan="2">template&lt;typename genType &gt; </td></tr>
    69. 

  69. <tr class="memitem:ga15aa87101457e41663b08a8dcc3357f8"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL genType&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00157.html#ga15aa87101457e41663b08a8dcc3357f8">normalize</a> (genType const &amp;x)</td></tr>
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  70. <tr class="separator:ga15aa87101457e41663b08a8dcc3357f8"><td class="memSeparator" colspan="2">&#160;</td></tr>
    71. 

  71. <tr class="memitem:gab63646fc36b81cf69d3ce123a72f76f2"><td class="memTemplParams" colspan="2">template&lt;typename genType &gt; </td></tr>
    72. 

  72. <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="a00157.html#gab63646fc36b81cf69d3ce123a72f76f2">reflect</a> (genType const &amp;I, genType const &amp;N)</td></tr>
    73. 

  73. <tr class="separator:gab63646fc36b81cf69d3ce123a72f76f2"><td class="memSeparator" colspan="2">&#160;</td></tr>
    74. 

  74. <tr class="memitem:ga99d8ddb244b129892babaca9778206d0"><td class="memTemplParams" colspan="2">template&lt;typename T , precision P, template&lt; typename, precision &gt; class vecType&gt; </td></tr>
    75. 

  75. <tr class="memitem:ga99d8ddb244b129892babaca9778206d0"><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="a00157.html#ga99d8ddb244b129892babaca9778206d0">refract</a> (vecType&lt; T, P &gt; const &amp;I, vecType&lt; T, P &gt; const &amp;N, T const &amp;eta)</td></tr>
    76. 

  76. <tr class="separator:ga99d8ddb244b129892babaca9778206d0"><td class="memSeparator" colspan="2">&#160;</td></tr>
    77. 

  77. </table>
    78. 

  78. <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
    79. 

  79. <p>These operate on vectors as vectors, not component-wise. </p>
    80. 

  80. <h2 class="groupheader">Function Documentation</h2>
    81. 

  81. <a class="anchor" id="ga89b91c2a256cfb62ecbc589d1ee36d3c"></a>
    82. 

  82. <div class="memitem">
    83. 

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

  84.       <table class="memname">
    85. 

  85.         <tr>
    86. 

  86.           <td class="memname">GLM_FUNC_DECL detail::tvec3&lt;T, P&gt; glm::cross </td>
    87. 

  87.           <td>(</td>
    88. 

  88.           <td class="paramtype">detail::tvec3&lt; T, P &gt; const &amp;&#160;</td>
    89. 

  89.           <td class="paramname"><em>x</em>, </td>
    90. 

  90.         </tr>
    91. 

  91.         <tr>
    92. 

  92.           <td class="paramkey"></td>
    93. 

  93.           <td></td>
    94. 

  94.           <td class="paramtype">detail::tvec3&lt; T, P &gt; const &amp;&#160;</td>
    95. 

  95.           <td class="paramname"><em>y</em>&#160;</td>
    96. 

  96.         </tr>
    97. 

  97.         <tr>
    98. 

  98.           <td></td>
    99. 

  99.           <td>)</td>
    100. 

  100.           <td></td><td></td>
    101. 

  101.         </tr>
    102. 

  102.       </table>
    103. 

  103. </div><div class="memdoc">
    104. 

  104. 

  105. <p>Returns the cross product of x and y. </p>
    106. 

  106. <dl class="tparams"><dt>Template Parameters</dt><dd>
    107. 

  107.   <table class="tparams">
    108. 

  108.     <tr><td class="paramname">valType</td><td>Floating-point scalar types.</td></tr>
    109. 

  109.   </table>
    110. 

  110.   </dd>
    111. 

  111. </dl>
    112. 

  112. <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>
    113. 

  113. <dd>
    114. 

  114. <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>
    115. 

  115. 

  116. </div>
    117. 

  117. </div>
    118. 

  118. <a class="anchor" id="ga00716eae37e8ae2a76ca7799f9c75682"></a>
    119. 

  119. <div class="memitem">
    120. 

  120. <div class="memproto">
    121. 

  121.       <table class="memname">
    122. 

  122.         <tr>
    123. 

  123.           <td class="memname">GLM_FUNC_DECL genType::value_type glm::distance </td>
    124. 

  124.           <td>(</td>
    125. 

  125.           <td class="paramtype">genType const &amp;&#160;</td>
    126. 

  126.           <td class="paramname"><em>p0</em>, </td>
    127. 

  127.         </tr>
    128. 

  128.         <tr>
    129. 

  129.           <td class="paramkey"></td>
    130. 

  130.           <td></td>
    131. 

  131.           <td class="paramtype">genType const &amp;&#160;</td>
    132. 

  132.           <td class="paramname"><em>p1</em>&#160;</td>
    133. 

  133.         </tr>
    134. 

  134.         <tr>
    135. 

  135.           <td></td>
    136. 

  136.           <td>)</td>
    137. 

  137.           <td></td><td></td>
    138. 

  138.         </tr>
    139. 

  139.       </table>
    140. 

  140. </div><div class="memdoc">
    141. 

  141. 

  142. <p>Returns the distance betwwen p0 and p1, i.e., length(p0 - p1). </p>
    143. 

  143. <dl class="tparams"><dt>Template Parameters</dt><dd>
    144. 

  144.   <table class="tparams">
    145. 

  145.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    146. 

  146.   </table>
    147. 

  147.   </dd>
    148. 

  148. </dl>
    149. 

  149. <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>
    150. 

  150. <dd>
    151. 

  151. <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>
    152. 

  152. 

  153. </div>
    154. 

  154. </div>
    155. 

  155. <a class="anchor" id="ga7dada304da2ba7dd3376ab4f178c3f6b"></a>
    156. 

  156. <div class="memitem">
    157. 

  157. <div class="memproto">
    158. 

  158.       <table class="memname">
    159. 

  159.         <tr>
    160. 

  160.           <td class="memname">GLM_FUNC_DECL T glm::dot </td>
    161. 

  161.           <td>(</td>
    162. 

  162.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    163. 

  163.           <td class="paramname"><em>x</em>, </td>
    164. 

  164.         </tr>
    165. 

  165.         <tr>
    166. 

  166.           <td class="paramkey"></td>
    167. 

  167.           <td></td>
    168. 

  168.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    169. 

  169.           <td class="paramname"><em>y</em>&#160;</td>
    170. 

  170.         </tr>
    171. 

  171.         <tr>
    172. 

  172.           <td></td>
    173. 

  173.           <td>)</td>
    174. 

  174.           <td></td><td></td>
    175. 

  175.         </tr>
    176. 

  176.       </table>
    177. 

  177. </div><div class="memdoc">
    178. 

  178. 

  179. <p>Returns the dot product of x and y, i.e., result = x * y. </p>
    180. 

  180. <dl class="tparams"><dt>Template Parameters</dt><dd>
    181. 

  181.   <table class="tparams">
    182. 

  182.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    183. 

  183.   </table>
    184. 

  184.   </dd>
    185. 

  185. </dl>
    186. 

  186. <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>
    187. 

  187. <dd>
    188. 

  188. <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>
    189. 

  189. 

  190. </div>
    191. 

  191. </div>
    192. 

  192. <a class="anchor" id="gaef767c2b0678489cb9de7a534137a86d"></a>
    193. 

  193. <div class="memitem">
    194. 

  194. <div class="memproto">
    195. 

  195.       <table class="memname">
    196. 

  196.         <tr>
    197. 

  197.           <td class="memname">GLM_FUNC_DECL genType glm::dot </td>
    198. 

  198.           <td>(</td>
    199. 

  199.           <td class="paramtype">genType const &amp;&#160;</td>
    200. 

  200.           <td class="paramname"><em>x</em>, </td>
    201. 

  201.         </tr>
    202. 

  202.         <tr>
    203. 

  203.           <td class="paramkey"></td>
    204. 

  204.           <td></td>
    205. 

  205.           <td class="paramtype">genType const &amp;&#160;</td>
    206. 

  206.           <td class="paramname"><em>y</em>&#160;</td>
    207. 

  207.         </tr>
    208. 

  208.         <tr>
    209. 

  209.           <td></td>
    210. 

  210.           <td>)</td>
    211. 

  211.           <td></td><td></td>
    212. 

  212.         </tr>
    213. 

  213.       </table>
    214. 

  214. </div><div class="memdoc">
    215. 

  215. 

  216. <p>Returns the dot product of x and y, i.e., result = x * y. </p>
    217. 

  217. <dl class="tparams"><dt>Template Parameters</dt><dd>
    218. 

  218.   <table class="tparams">
    219. 

  219.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    220. 

  220.   </table>
    221. 

  221.   </dd>
    222. 

  222. </dl>
    223. 

  223. <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>
    224. 

  224. <dd>
    225. 

  225. <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>
    226. 

  226. 

  227. </div>
    228. 

  228. </div>
    229. 

  229. <a class="anchor" id="ga4bbb036ef9527ee9f67384233029ed9b"></a>
    230. 

  230. <div class="memitem">
    231. 

  231. <div class="memproto">
    232. 

  232.       <table class="memname">
    233. 

  233.         <tr>
    234. 

  234.           <td class="memname">GLM_FUNC_DECL genType glm::faceforward </td>
    235. 

  235.           <td>(</td>
    236. 

  236.           <td class="paramtype">genType const &amp;&#160;</td>
    237. 

  237.           <td class="paramname"><em>N</em>, </td>
    238. 

  238.         </tr>
    239. 

  239.         <tr>
    240. 

  240.           <td class="paramkey"></td>
    241. 

  241.           <td></td>
    242. 

  242.           <td class="paramtype">genType const &amp;&#160;</td>
    243. 

  243.           <td class="paramname"><em>I</em>, </td>
    244. 

  244.         </tr>
    245. 

  245.         <tr>
    246. 

  246.           <td class="paramkey"></td>
    247. 

  247.           <td></td>
    248. 

  248.           <td class="paramtype">genType const &amp;&#160;</td>
    249. 

  249.           <td class="paramname"><em>Nref</em>&#160;</td>
    250. 

  250.         </tr>
    251. 

  251.         <tr>
    252. 

  252.           <td></td>
    253. 

  253.           <td>)</td>
    254. 

  254.           <td></td><td></td>
    255. 

  255.         </tr>
    256. 

  256.       </table>
    257. 

  257. </div><div class="memdoc">
    258. 

  258. 

  259. <p>If dot(Nref, I) &lt; 0.0, return N, otherwise, return -N. </p>
    260. 

  260. <dl class="tparams"><dt>Template Parameters</dt><dd>
    261. 

  261.   <table class="tparams">
    262. 

  262.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    263. 

  263.   </table>
    264. 

  264.   </dd>
    265. 

  265. </dl>
    266. 

  266. <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>
    267. 

  267. <dd>
    268. 

  268. <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>
    269. 

  269. 

  270. </div>
    271. 

  271. </div>
    272. 

  272. <a class="anchor" id="ga03b2831439defb8922832b540b91b8a7"></a>
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  273. <div class="memitem">
    274. 

  274. <div class="memproto">
    275. 

  275.       <table class="memname">
    276. 

  276.         <tr>
    277. 

  277.           <td class="memname">GLM_FUNC_DECL genType::value_type glm::length </td>
    278. 

  278.           <td>(</td>
    279. 

  279.           <td class="paramtype">genType const &amp;&#160;</td>
    280. 

  280.           <td class="paramname"><em>x</em></td><td>)</td>
    281. 

  281.           <td></td>
    282. 

  282.         </tr>
    283. 

  283.       </table>
    284. 

  284. </div><div class="memdoc">
    285. 

  285. 

  286. <p>Returns the length of x, i.e., sqrt(x * x). </p>
    287. 

  287. <dl class="tparams"><dt>Template Parameters</dt><dd>
    288. 

  288.   <table class="tparams">
    289. 

  289.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    290. 

  290.   </table>
    291. 

  291.   </dd>
    292. 

  292. </dl>
    293. 

  293. <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>
    294. 

  294. <dd>
    295. 

  295. <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>
    296. 

  296. 

  297. </div>
    298. 

  298. </div>
    299. 

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    302. 

  302.       <table class="memname">
    303. 

  303.         <tr>
    304. 

  304.           <td class="memname">GLM_FUNC_DECL genType glm::normalize </td>
    305. 

  305.           <td>(</td>
    306. 

  306.           <td class="paramtype">genType const &amp;&#160;</td>
    307. 

  307.           <td class="paramname"><em>x</em></td><td>)</td>
    308. 

  308.           <td></td>
    309. 

  309.         </tr>
    310. 

  310.       </table>
    311. 

  311. </div><div class="memdoc">
    312. 

  312. 

  313. <p>Returns a vector in the same direction as x but with length of 1. </p>
    314. 

  314. <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>
    315. 

  315. <dd>
    316. 

  316. <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>
    317. 

  317. 

  318. </div>
    319. 

  319. </div>
    320. 

  320. <a class="anchor" id="gab63646fc36b81cf69d3ce123a72f76f2"></a>
    321. 

  321. <div class="memitem">
    322. 

  322. <div class="memproto">
    323. 

  323.       <table class="memname">
    324. 

  324.         <tr>
    325. 

  325.           <td class="memname">GLM_FUNC_DECL genType glm::reflect </td>
    326. 

  326.           <td>(</td>
    327. 

  327.           <td class="paramtype">genType const &amp;&#160;</td>
    328. 

  328.           <td class="paramname"><em>I</em>, </td>
    329. 

  329.         </tr>
    330. 

  330.         <tr>
    331. 

  331.           <td class="paramkey"></td>
    332. 

  332.           <td></td>
    333. 

  333.           <td class="paramtype">genType const &amp;&#160;</td>
    334. 

  334.           <td class="paramname"><em>N</em>&#160;</td>
    335. 

  335.         </tr>
    336. 

  336.         <tr>
    337. 

  337.           <td></td>
    338. 

  338.           <td>)</td>
    339. 

  339.           <td></td><td></td>
    340. 

  340.         </tr>
    341. 

  341.       </table>
    342. 

  342. </div><div class="memdoc">
    343. 

  343. 

  344. <p>For the incident vector I and surface orientation N, returns the reflection direction : result = I - 2.0 * dot(N, I) * N. </p>
    345. 

  345. <dl class="tparams"><dt>Template Parameters</dt><dd>
    346. 

  346.   <table class="tparams">
    347. 

  347.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    348. 

  348.   </table>
    349. 

  349.   </dd>
    350. 

  350. </dl>
    351. 

  351. <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>
    352. 

  352. <dd>
    353. 

  353. <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>
    354. 

  354. 

  355. </div>
    356. 

  356. </div>
    357. 

  357. <a class="anchor" id="ga99d8ddb244b129892babaca9778206d0"></a>
    358. 

  358. <div class="memitem">
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    360. 

  360.       <table class="memname">
    361. 

  361.         <tr>
    362. 

  362.           <td class="memname">GLM_FUNC_DECL vecType&lt;T, P&gt; glm::refract </td>
    363. 

  363.           <td>(</td>
    364. 

  364.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    365. 

  365.           <td class="paramname"><em>I</em>, </td>
    366. 

  366.         </tr>
    367. 

  367.         <tr>
    368. 

  368.           <td class="paramkey"></td>
    369. 

  369.           <td></td>
    370. 

  370.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    371. 

  371.           <td class="paramname"><em>N</em>, </td>
    372. 

  372.         </tr>
    373. 

  373.         <tr>
    374. 

  374.           <td class="paramkey"></td>
    375. 

  375.           <td></td>
    376. 

  376.           <td class="paramtype">T const &amp;&#160;</td>
    377. 

  377.           <td class="paramname"><em>eta</em>&#160;</td>
    378. 

  378.         </tr>
    379. 

  379.         <tr>
    380. 

  380.           <td></td>
    381. 

  381.           <td>)</td>
    382. 

  382.           <td></td><td></td>
    383. 

  383.         </tr>
    384. 

  384.       </table>
    385. 

  385. </div><div class="memdoc">
    386. 

  386. 

  387. <p>For the incident vector I and surface normal N, and the ratio of indices of refraction eta, return the refraction vector. </p>
    388. 

  388. <dl class="tparams"><dt>Template Parameters</dt><dd>
    389. 

  389.   <table class="tparams">
    390. 

  390.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    391. 

  391.   </table>
    392. 

  392.   </dd>
    393. 

  393. </dl>
    394. 

  394. <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>
    395. 

  395. <dd>
    396. 

  396. <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>
    397. 

  397. 

  398. </div>
    399. 

  399. </div>
    400. 

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    401. 

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    402. 

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    403. 

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