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    38. 

  38. <div class="header">
    39. 

  39.   <div class="summary">
    40. 

  40. <a href="#func-members">Functions</a>  </div>
    41. 

  41.   <div class="headertitle">
    42. 

  42. <div class="title">Geometric functions<div class="ingroups"><a class="el" href="a00155.html">GLM Core</a></div></div>  </div>
    43. 

  43. </div><!--header-->
    44. 

  44. <div class="contents">
    45. 

  45. 

  46. <p>These operate on vectors as vectors, not component-wise.  
    47. 

  47. <a href="#details">More...</a></p>
    48. 

  48. <table class="memberdecls">
    49. 

  49. <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
    50. 

  50. Functions</h2></td></tr>
    51. 

  51. <tr class="memitem:gafe2cae8cb26fd44be62aee97369d0af8"><td class="memTemplParams" colspan="2">template&lt;typename T , precision P&gt; </td></tr>
    52. 

  52. <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>
    53. 

  53. <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>
    54. 

  54. <tr class="separator:gafe2cae8cb26fd44be62aee97369d0af8"><td class="memSeparator" colspan="2">&#160;</td></tr>
    55. 

  55. <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>
    56. 

  56. <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>
    57. 

  57. <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>
    58. 

  58. <tr class="separator:ga7ca317dde0d7e94d920153554d4a02a8"><td class="memSeparator" colspan="2">&#160;</td></tr>
    59. 

  59. <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>
    60. 

  60. <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>
    61. 

  61. <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>
    62. 

  62. <tr class="separator:ga7dada304da2ba7dd3376ab4f178c3f6b"><td class="memSeparator" colspan="2">&#160;</td></tr>
    63. 

  63. <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>
    64. 

  64. <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>
    65. 

  65. <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>
    66. 

  66. <tr class="separator:gaea854e5aec1b5839832ac2dfc7cd3c0d"><td class="memSeparator" colspan="2">&#160;</td></tr>
    67. 

  67. <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>
    68. 

  68. <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>
    69. 

  69. <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>
    70. 

  70. <tr class="separator:ga18d45e3d4c7705e67ccfabd99e521604"><td class="memSeparator" colspan="2">&#160;</td></tr>
    71. 

  71. <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>
    72. 

  72. <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>
    73. 

  73. <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>
    74. 

  74. <tr class="separator:gada9451ec170a36fe53552812b9c03a68"><td class="memSeparator" colspan="2">&#160;</td></tr>
    75. 

  75. <tr class="memitem:gab63646fc36b81cf69d3ce123a72f76f2"><td class="memTemplParams" colspan="2">template&lt;typename genType &gt; </td></tr>
    76. 

  76. <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>
    77. 

  77. <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>
    78. 

  78. <tr class="separator:gab63646fc36b81cf69d3ce123a72f76f2"><td class="memSeparator" colspan="2">&#160;</td></tr>
    79. 

  79. <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>
    80. 

  80. <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>
    81. 

  81. <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>
    82. 

  82. <tr class="separator:gab7e7cdf4403931a5f7b74560ad64159b"><td class="memSeparator" colspan="2">&#160;</td></tr>
    83. 

  83. </table>
    84. 

  84. <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
    85. 

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

  86. <h2 class="groupheader">Function Documentation</h2>
    87. 

  87. <a class="anchor" id="gafe2cae8cb26fd44be62aee97369d0af8"></a>
    88. 

  88. <div class="memitem">
    89. 

  89. <div class="memproto">
    90. 

  90.       <table class="memname">
    91. 

  91.         <tr>
    92. 

  92.           <td class="memname">GLM_FUNC_DECL tvec3&lt;T, P&gt; glm::cross </td>
    93. 

  93.           <td>(</td>
    94. 

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

  95.           <td class="paramname"><em>x</em>, </td>
    96. 

  96.         </tr>
    97. 

  97.         <tr>
    98. 

  98.           <td class="paramkey"></td>
    99. 

  99.           <td></td>
    100. 

  100.           <td class="paramtype">tvec3&lt; T, P &gt; const &amp;&#160;</td>
    101. 

  101.           <td class="paramname"><em>y</em>&#160;</td>
    102. 

  102.         </tr>
    103. 

  103.         <tr>
    104. 

  104.           <td></td>
    105. 

  105.           <td>)</td>
    106. 

  106.           <td></td><td></td>
    107. 

  107.         </tr>
    108. 

  108.       </table>
    109. 

  109. </div><div class="memdoc">
    110. 

  110. 

  111. <p>Returns the cross product of x and y. </p>
    112. 

  112. <dl class="tparams"><dt>Template Parameters</dt><dd>
    113. 

  113.   <table class="tparams">
    114. 

  114.     <tr><td class="paramname">valType</td><td>Floating-point scalar types.</td></tr>
    115. 

  115.   </table>
    116. 

  116.   </dd>
    117. 

  117. </dl>
    118. 

  118. <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>
    119. 

  119. <dd>
    120. 

  120. <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>
    121. 

  121. 

  122. </div>
    123. 

  123. </div>
    124. 

  124. <a class="anchor" id="ga7ca317dde0d7e94d920153554d4a02a8"></a>
    125. 

  125. <div class="memitem">
    126. 

  126. <div class="memproto">
    127. 

  127.       <table class="memname">
    128. 

  128.         <tr>
    129. 

  129.           <td class="memname">GLM_FUNC_DECL T glm::distance </td>
    130. 

  130.           <td>(</td>
    131. 

  131.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    132. 

  132.           <td class="paramname"><em>p0</em>, </td>
    133. 

  133.         </tr>
    134. 

  134.         <tr>
    135. 

  135.           <td class="paramkey"></td>
    136. 

  136.           <td></td>
    137. 

  137.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    138. 

  138.           <td class="paramname"><em>p1</em>&#160;</td>
    139. 

  139.         </tr>
    140. 

  140.         <tr>
    141. 

  141.           <td></td>
    142. 

  142.           <td>)</td>
    143. 

  143.           <td></td><td></td>
    144. 

  144.         </tr>
    145. 

  145.       </table>
    146. 

  146. </div><div class="memdoc">
    147. 

  147. 

  148. <p>Returns the distance betwwen p0 and p1, i.e., length(p0 - p1). </p>
    149. 

  149. <dl class="tparams"><dt>Template Parameters</dt><dd>
    150. 

  150.   <table class="tparams">
    151. 

  151.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    152. 

  152.   </table>
    153. 

  153.   </dd>
    154. 

  154. </dl>
    155. 

  155. <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>
    156. 

  156. <dd>
    157. 

  157. <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>
    158. 

  158. 

  159. </div>
    160. 

  160. </div>
    161. 

  161. <a class="anchor" id="ga7dada304da2ba7dd3376ab4f178c3f6b"></a>
    162. 

  162. <div class="memitem">
    163. 

  163. <div class="memproto">
    164. 

  164.       <table class="memname">
    165. 

  165.         <tr>
    166. 

  166.           <td class="memname">GLM_FUNC_DECL T glm::dot </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>x</em>, </td>
    170. 

  170.         </tr>
    171. 

  171.         <tr>
    172. 

  172.           <td class="paramkey"></td>
    173. 

  173.           <td></td>
    174. 

  174.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    175. 

  175.           <td class="paramname"><em>y</em>&#160;</td>
    176. 

  176.         </tr>
    177. 

  177.         <tr>
    178. 

  178.           <td></td>
    179. 

  179.           <td>)</td>
    180. 

  180.           <td></td><td></td>
    181. 

  181.         </tr>
    182. 

  182.       </table>
    183. 

  183. </div><div class="memdoc">
    184. 

  184. 

  185. <p>Returns the dot product of x and y, i.e., result = x * y. </p>
    186. 

  186. <dl class="tparams"><dt>Template Parameters</dt><dd>
    187. 

  187.   <table class="tparams">
    188. 

  188.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    189. 

  189.   </table>
    190. 

  190.   </dd>
    191. 

  191. </dl>
    192. 

  192. <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>
    193. 

  193. <dd>
    194. 

  194. <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>
    195. 

  195. 

  196. </div>
    197. 

  197. </div>
    198. 

  198. <a class="anchor" id="gaea854e5aec1b5839832ac2dfc7cd3c0d"></a>
    199. 

  199. <div class="memitem">
    200. 

  200. <div class="memproto">
    201. 

  201.       <table class="memname">
    202. 

  202.         <tr>
    203. 

  203.           <td class="memname">GLM_FUNC_DECL vecType&lt;T, P&gt; glm::faceforward </td>
    204. 

  204.           <td>(</td>
    205. 

  205.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    206. 

  206.           <td class="paramname"><em>N</em>, </td>
    207. 

  207.         </tr>
    208. 

  208.         <tr>
    209. 

  209.           <td class="paramkey"></td>
    210. 

  210.           <td></td>
    211. 

  211.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    212. 

  212.           <td class="paramname"><em>I</em>, </td>
    213. 

  213.         </tr>
    214. 

  214.         <tr>
    215. 

  215.           <td class="paramkey"></td>
    216. 

  216.           <td></td>
    217. 

  217.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    218. 

  218.           <td class="paramname"><em>Nref</em>&#160;</td>
    219. 

  219.         </tr>
    220. 

  220.         <tr>
    221. 

  221.           <td></td>
    222. 

  222.           <td>)</td>
    223. 

  223.           <td></td><td></td>
    224. 

  224.         </tr>
    225. 

  225.       </table>
    226. 

  226. </div><div class="memdoc">
    227. 

  227. 

  228. <p>If dot(Nref, I) &lt; 0.0, return N, otherwise, return -N. </p>
    229. 

  229. <dl class="tparams"><dt>Template Parameters</dt><dd>
    230. 

  230.   <table class="tparams">
    231. 

  231.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    232. 

  232.   </table>
    233. 

  233.   </dd>
    234. 

  234. </dl>
    235. 

  235. <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>
    236. 

  236. <dd>
    237. 

  237. <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>
    238. 

  238. 

  239. </div>
    240. 

  240. </div>
    241. 

  241. <a class="anchor" id="ga18d45e3d4c7705e67ccfabd99e521604"></a>
    242. 

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

  243. <div class="memproto">
    244. 

  244.       <table class="memname">
    245. 

  245.         <tr>
    246. 

  246.           <td class="memname">GLM_FUNC_DECL T glm::length </td>
    247. 

  247.           <td>(</td>
    248. 

  248.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    249. 

  249.           <td class="paramname"><em>x</em></td><td>)</td>
    250. 

  250.           <td></td>
    251. 

  251.         </tr>
    252. 

  252.       </table>
    253. 

  253. </div><div class="memdoc">
    254. 

  254. 

  255. <p>Returns the length of x, i.e., sqrt(x * x). </p>
    256. 

  256. <dl class="tparams"><dt>Template Parameters</dt><dd>
    257. 

  257.   <table class="tparams">
    258. 

  258.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    259. 

  259.   </table>
    260. 

  260.   </dd>
    261. 

  261. </dl>
    262. 

  262. <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>
    263. 

  263. <dd>
    264. 

  264. <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>
    265. 

  265. 

  266. </div>
    267. 

  267. </div>
    268. 

  268. <a class="anchor" id="gada9451ec170a36fe53552812b9c03a68"></a>
    269. 

  269. <div class="memitem">
    270. 

  270. <div class="memproto">
    271. 

  271.       <table class="memname">
    272. 

  272.         <tr>
    273. 

  273.           <td class="memname">GLM_FUNC_DECL vecType&lt;T, P&gt; glm::normalize </td>
    274. 

  274.           <td>(</td>
    275. 

  275.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    276. 

  276.           <td class="paramname"><em>x</em></td><td>)</td>
    277. 

  277.           <td></td>
    278. 

  278.         </tr>
    279. 

  279.       </table>
    280. 

  280. </div><div class="memdoc">
    281. 

  281. 

  282. <p>Returns a vector in the same direction as x but with length of 1. </p>
    283. 

  283. <p>According to issue 10 GLSL 1.10 specification, if length(x) == 0 then result is undefined and generate an error.</p>
    284. 

  284. <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>
    285. 

  285. <dd>
    286. 

  286. <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>
    287. 

  287. 

  288. </div>
    289. 

  289. </div>
    290. 

  290. <a class="anchor" id="gab63646fc36b81cf69d3ce123a72f76f2"></a>
    291. 

  291. <div class="memitem">
    292. 

  292. <div class="memproto">
    293. 

  293.       <table class="memname">
    294. 

  294.         <tr>
    295. 

  295.           <td class="memname">GLM_FUNC_DECL genType glm::reflect </td>
    296. 

  296.           <td>(</td>
    297. 

  297.           <td class="paramtype">genType const &amp;&#160;</td>
    298. 

  298.           <td class="paramname"><em>I</em>, </td>
    299. 

  299.         </tr>
    300. 

  300.         <tr>
    301. 

  301.           <td class="paramkey"></td>
    302. 

  302.           <td></td>
    303. 

  303.           <td class="paramtype">genType const &amp;&#160;</td>
    304. 

  304.           <td class="paramname"><em>N</em>&#160;</td>
    305. 

  305.         </tr>
    306. 

  306.         <tr>
    307. 

  307.           <td></td>
    308. 

  308.           <td>)</td>
    309. 

  309.           <td></td><td></td>
    310. 

  310.         </tr>
    311. 

  311.       </table>
    312. 

  312. </div><div class="memdoc">
    313. 

  313. 

  314. <p>For the incident vector I and surface orientation N, returns the reflection direction : result = I - 2.0 * dot(N, I) * N. </p>
    315. 

  315. <dl class="tparams"><dt>Template Parameters</dt><dd>
    316. 

  316.   <table class="tparams">
    317. 

  317.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    318. 

  318.   </table>
    319. 

  319.   </dd>
    320. 

  320. </dl>
    321. 

  321. <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>
    322. 

  322. <dd>
    323. 

  323. <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>
    324. 

  324. 

  325. </div>
    326. 

  326. </div>
    327. 

  327. <a class="anchor" id="gab7e7cdf4403931a5f7b74560ad64159b"></a>
    328. 

  328. <div class="memitem">
    329. 

  329. <div class="memproto">
    330. 

  330.       <table class="memname">
    331. 

  331.         <tr>
    332. 

  332.           <td class="memname">GLM_FUNC_DECL vecType&lt;T, P&gt; glm::refract </td>
    333. 

  333.           <td>(</td>
    334. 

  334.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    335. 

  335.           <td class="paramname"><em>I</em>, </td>
    336. 

  336.         </tr>
    337. 

  337.         <tr>
    338. 

  338.           <td class="paramkey"></td>
    339. 

  339.           <td></td>
    340. 

  340.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    341. 

  341.           <td class="paramname"><em>N</em>, </td>
    342. 

  342.         </tr>
    343. 

  343.         <tr>
    344. 

  344.           <td class="paramkey"></td>
    345. 

  345.           <td></td>
    346. 

  346.           <td class="paramtype">T&#160;</td>
    347. 

  347.           <td class="paramname"><em>eta</em>&#160;</td>
    348. 

  348.         </tr>
    349. 

  349.         <tr>
    350. 

  350.           <td></td>
    351. 

  351.           <td>)</td>
    352. 

  352.           <td></td><td></td>
    353. 

  353.         </tr>
    354. 

  354.       </table>
    355. 

  355. </div><div class="memdoc">
    356. 

  356. 

  357. <p>For the incident vector I and surface normal N, and the ratio of indices of refraction eta, return the refraction vector. </p>
    358. 

  358. <dl class="tparams"><dt>Template Parameters</dt><dd>
    359. 

  359.   <table class="tparams">
    360. 

  360.     <tr><td class="paramname">genType</td><td>Floating-point vector types.</td></tr>
    361. 

  361.   </table>
    362. 

  362.   </dd>
    363. 

  363. </dl>
    364. 

  364. <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>
    365. 

  365. <dd>
    366. 

  366. <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>
    367. 

  367. 

  368. </div>
    369. 

  369. </div>
    370. 

  370. </div><!-- contents -->
    371. 

  371. <!-- start footer part -->
    372. 

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    373. 

  373. Generated by &#160;<a href="http://www.doxygen.org/index.html">
    374. 

  374. <img class="footer" src="doxygen.png" alt="doxygen"/>
    375. 

  375. </a> 1.8.10
    376. 

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    377. 

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    378. 

  378. </html>
    379.