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  7. <title>0.9.8 API documenation: GLM_GTX_fast_square_root</title>
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  39.   <div class="summary">
    40. 

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

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

  42. <div class="title">GLM_GTX_fast_square_root<div class="ingroups"><a class="el" href="a00154.html">GTX Extensions (Experimental)</a></div></div>  </div>
    43. 

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

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

  45. 

  46. <p>Fast but less accurate implementations of square root based functions.  
    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:gaac333418d0c4e0cc6d3d219ed606c238"><td class="memTemplParams" colspan="2">template&lt;typename genType &gt; </td></tr>
    52. 

  52. <tr class="memitem:gaac333418d0c4e0cc6d3d219ed606c238"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL genType&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00194.html#gaac333418d0c4e0cc6d3d219ed606c238">fastDistance</a> (genType x, genType y)</td></tr>
    53. 

  53. <tr class="memdesc:gaac333418d0c4e0cc6d3d219ed606c238"><td class="mdescLeft">&#160;</td><td class="mdescRight">Faster than the common distance function but less accurate.  <a href="a00194.html#gaac333418d0c4e0cc6d3d219ed606c238">More...</a><br /></td></tr>
    54. 

  54. <tr class="separator:gaac333418d0c4e0cc6d3d219ed606c238"><td class="memSeparator" colspan="2">&#160;</td></tr>
    55. 

  55. <tr class="memitem:ga6d1ac559cd77d69119e30c3aca0e14b5"><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:ga6d1ac559cd77d69119e30c3aca0e14b5"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL T&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00194.html#ga6d1ac559cd77d69119e30c3aca0e14b5">fastDistance</a> (vecType&lt; T, P &gt; const &amp;x, vecType&lt; T, P &gt; const &amp;y)</td></tr>
    57. 

  57. <tr class="memdesc:ga6d1ac559cd77d69119e30c3aca0e14b5"><td class="mdescLeft">&#160;</td><td class="mdescRight">Faster than the common distance function but less accurate.  <a href="a00194.html#ga6d1ac559cd77d69119e30c3aca0e14b5">More...</a><br /></td></tr>
    58. 

  58. <tr class="separator:ga6d1ac559cd77d69119e30c3aca0e14b5"><td class="memSeparator" colspan="2">&#160;</td></tr>
    59. 

  59. <tr class="memitem:ga7f081b14d9c7035c8714eba5f7f75a8f"><td class="memTemplParams" colspan="2">template&lt;typename genType &gt; </td></tr>
    60. 

  60. <tr class="memitem:ga7f081b14d9c7035c8714eba5f7f75a8f"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL genType&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00194.html#ga7f081b14d9c7035c8714eba5f7f75a8f">fastInverseSqrt</a> (genType x)</td></tr>
    61. 

  61. <tr class="memdesc:ga7f081b14d9c7035c8714eba5f7f75a8f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Faster than the common inversesqrt function but less accurate.  <a href="a00194.html#ga7f081b14d9c7035c8714eba5f7f75a8f">More...</a><br /></td></tr>
    62. 

  62. <tr class="separator:ga7f081b14d9c7035c8714eba5f7f75a8f"><td class="memSeparator" colspan="2">&#160;</td></tr>
    63. 

  63. <tr class="memitem:ga903878071f92e51e551791e584a171a1"><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:ga903878071f92e51e551791e584a171a1"><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="a00194.html#ga903878071f92e51e551791e584a171a1">fastInverseSqrt</a> (vecType&lt; T, P &gt; const &amp;x)</td></tr>
    65. 

  65. <tr class="memdesc:ga903878071f92e51e551791e584a171a1"><td class="mdescLeft">&#160;</td><td class="mdescRight">Faster than the common inversesqrt function but less accurate.  <a href="a00194.html#ga903878071f92e51e551791e584a171a1">More...</a><br /></td></tr>
    66. 

  66. <tr class="separator:ga903878071f92e51e551791e584a171a1"><td class="memSeparator" colspan="2">&#160;</td></tr>
    67. 

  67. <tr class="memitem:gafe697d6287719538346bbdf8b1367c59"><td class="memTemplParams" colspan="2">template&lt;typename genType &gt; </td></tr>
    68. 

  68. <tr class="memitem:gafe697d6287719538346bbdf8b1367c59"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL genType&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00194.html#gafe697d6287719538346bbdf8b1367c59">fastLength</a> (genType x)</td></tr>
    69. 

  69. <tr class="memdesc:gafe697d6287719538346bbdf8b1367c59"><td class="mdescLeft">&#160;</td><td class="mdescRight">Faster than the common length function but less accurate.  <a href="a00194.html#gafe697d6287719538346bbdf8b1367c59">More...</a><br /></td></tr>
    70. 

  70. <tr class="separator:gafe697d6287719538346bbdf8b1367c59"><td class="memSeparator" colspan="2">&#160;</td></tr>
    71. 

  71. <tr class="memitem:gae28a3099cbd6404a4ea8ef22147ed7b0"><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:gae28a3099cbd6404a4ea8ef22147ed7b0"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL T&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00194.html#gae28a3099cbd6404a4ea8ef22147ed7b0">fastLength</a> (vecType&lt; T, P &gt; const &amp;x)</td></tr>
    73. 

  73. <tr class="memdesc:gae28a3099cbd6404a4ea8ef22147ed7b0"><td class="mdescLeft">&#160;</td><td class="mdescRight">Faster than the common length function but less accurate.  <a href="a00194.html#gae28a3099cbd6404a4ea8ef22147ed7b0">More...</a><br /></td></tr>
    74. 

  74. <tr class="separator:gae28a3099cbd6404a4ea8ef22147ed7b0"><td class="memSeparator" colspan="2">&#160;</td></tr>
    75. 

  75. <tr class="memitem:ga3b02c1d6e0c754144e2f1e110bf9f16c"><td class="memTemplParams" colspan="2">template&lt;typename genType &gt; </td></tr>
    76. 

  76. <tr class="memitem:ga3b02c1d6e0c754144e2f1e110bf9f16c"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL genType&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00194.html#ga3b02c1d6e0c754144e2f1e110bf9f16c">fastNormalize</a> (genType const &amp;x)</td></tr>
    77. 

  77. <tr class="memdesc:ga3b02c1d6e0c754144e2f1e110bf9f16c"><td class="mdescLeft">&#160;</td><td class="mdescRight">Faster than the common normalize function but less accurate.  <a href="a00194.html#ga3b02c1d6e0c754144e2f1e110bf9f16c">More...</a><br /></td></tr>
    78. 

  78. <tr class="separator:ga3b02c1d6e0c754144e2f1e110bf9f16c"><td class="memSeparator" colspan="2">&#160;</td></tr>
    79. 

  79. <tr class="memitem:ga6c460e9414a50b2fc455c8f64c86cdc9"><td class="memTemplParams" colspan="2">template&lt;typename genType &gt; </td></tr>
    80. 

  80. <tr class="memitem:ga6c460e9414a50b2fc455c8f64c86cdc9"><td class="memTemplItemLeft" align="right" valign="top">GLM_FUNC_DECL genType&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00194.html#ga6c460e9414a50b2fc455c8f64c86cdc9">fastSqrt</a> (genType x)</td></tr>
    81. 

  81. <tr class="memdesc:ga6c460e9414a50b2fc455c8f64c86cdc9"><td class="mdescLeft">&#160;</td><td class="mdescRight">Faster than the common sqrt function but less accurate.  <a href="a00194.html#ga6c460e9414a50b2fc455c8f64c86cdc9">More...</a><br /></td></tr>
    82. 

  82. <tr class="separator:ga6c460e9414a50b2fc455c8f64c86cdc9"><td class="memSeparator" colspan="2">&#160;</td></tr>
    83. 

  83. <tr class="memitem:gaad9f601bbc3faa04dda384e4c4e1592c"><td class="memTemplParams" colspan="2">template&lt;typename T , precision P, template&lt; typename, precision &gt; class vecType&gt; </td></tr>
    84. 

  84. <tr class="memitem:gaad9f601bbc3faa04dda384e4c4e1592c"><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="a00194.html#gaad9f601bbc3faa04dda384e4c4e1592c">fastSqrt</a> (vecType&lt; T, P &gt; const &amp;x)</td></tr>
    85. 

  85. <tr class="memdesc:gaad9f601bbc3faa04dda384e4c4e1592c"><td class="mdescLeft">&#160;</td><td class="mdescRight">Faster than the common sqrt function but less accurate.  <a href="a00194.html#gaad9f601bbc3faa04dda384e4c4e1592c">More...</a><br /></td></tr>
    86. 

  86. <tr class="separator:gaad9f601bbc3faa04dda384e4c4e1592c"><td class="memSeparator" colspan="2">&#160;</td></tr>
    87. 

  87. </table>
    88. 

  88. <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
    89. 

  89. <p>Fast but less accurate implementations of square root based functions. </p>
    90. 

  90. <ul>
    91. 

  91. <li>Sqrt optimisation based on Newton's method, www.gamedev.net/community/forums/topic.asp?topic id=139956</li>
    92. 

  92. </ul>
    93. 

  93. <p>&lt;<a class="el" href="a00028.html" title="GLM_GTX_fast_square_root ">glm/gtx/fast_square_root.hpp</a>&gt; need to be included to use these functionalities. </p>
    94. 

  94. <h2 class="groupheader">Function Documentation</h2>
    95. 

  95. <a class="anchor" id="gaac333418d0c4e0cc6d3d219ed606c238"></a>
    96. 

  96. <div class="memitem">
    97. 

  97. <div class="memproto">
    98. 

  98.       <table class="memname">
    99. 

  99.         <tr>
    100. 

  100.           <td class="memname">GLM_FUNC_DECL genType glm::fastDistance </td>
    101. 

  101.           <td>(</td>
    102. 

  102.           <td class="paramtype">genType&#160;</td>
    103. 

  103.           <td class="paramname"><em>x</em>, </td>
    104. 

  104.         </tr>
    105. 

  105.         <tr>
    106. 

  106.           <td class="paramkey"></td>
    107. 

  107.           <td></td>
    108. 

  108.           <td class="paramtype">genType&#160;</td>
    109. 

  109.           <td class="paramname"><em>y</em>&#160;</td>
    110. 

  110.         </tr>
    111. 

  111.         <tr>
    112. 

  112.           <td></td>
    113. 

  113.           <td>)</td>
    114. 

  114.           <td></td><td></td>
    115. 

  115.         </tr>
    116. 

  116.       </table>
    117. 

  117. </div><div class="memdoc">
    118. 

  118. 

  119. <p>Faster than the common distance function but less accurate. </p>
    120. 

  120. <dl class="section see"><dt>See also</dt><dd><a class="el" href="a00194.html" title="Fast but less accurate implementations of square root based functions. ">GLM_GTX_fast_square_root</a> extension. </dd></dl>
    121. 

  121. 

  122. </div>
    123. 

  123. </div>
    124. 

  124. <a class="anchor" id="ga6d1ac559cd77d69119e30c3aca0e14b5"></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::fastDistance </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>x</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>y</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>Faster than the common distance function but less accurate. </p>
    149. 

  149. <dl class="section see"><dt>See also</dt><dd><a class="el" href="a00194.html" title="Fast but less accurate implementations of square root based functions. ">GLM_GTX_fast_square_root</a> extension. </dd></dl>
    150. 

  150. 

  151. </div>
    152. 

  152. </div>
    153. 

  153. <a class="anchor" id="ga7f081b14d9c7035c8714eba5f7f75a8f"></a>
    154. 

  154. <div class="memitem">
    155. 

  155. <div class="memproto">
    156. 

  156.       <table class="memname">
    157. 

  157.         <tr>
    158. 

  158.           <td class="memname">GLM_FUNC_DECL genType glm::fastInverseSqrt </td>
    159. 

  159.           <td>(</td>
    160. 

  160.           <td class="paramtype">genType&#160;</td>
    161. 

  161.           <td class="paramname"><em>x</em></td><td>)</td>
    162. 

  162.           <td></td>
    163. 

  163.         </tr>
    164. 

  164.       </table>
    165. 

  165. </div><div class="memdoc">
    166. 

  166. 

  167. <p>Faster than the common inversesqrt function but less accurate. </p>
    168. 

  168. <dl class="section see"><dt>See also</dt><dd><a class="el" href="a00194.html" title="Fast but less accurate implementations of square root based functions. ">GLM_GTX_fast_square_root</a> extension. </dd></dl>
    169. 

  169. 

  170. </div>
    171. 

  171. </div>
    172. 

  172. <a class="anchor" id="ga903878071f92e51e551791e584a171a1"></a>
    173. 

  173. <div class="memitem">
    174. 

  174. <div class="memproto">
    175. 

  175.       <table class="memname">
    176. 

  176.         <tr>
    177. 

  177.           <td class="memname">GLM_FUNC_DECL vecType&lt;T, P&gt; glm::fastInverseSqrt </td>
    178. 

  178.           <td>(</td>
    179. 

  179.           <td class="paramtype">vecType&lt; T, P &gt; const &amp;&#160;</td>
    180. 

  180.           <td class="paramname"><em>x</em></td><td>)</td>
    181. 

  181.           <td></td>
    182. 

  182.         </tr>
    183. 

  183.       </table>
    184. 

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

  185. 

  186. <p>Faster than the common inversesqrt function but less accurate. </p>
    187. 

  187. <dl class="section see"><dt>See also</dt><dd><a class="el" href="a00194.html" title="Fast but less accurate implementations of square root based functions. ">GLM_GTX_fast_square_root</a> extension. </dd></dl>
    188. 

  188. 

  189. </div>
    190. 

  190. </div>
    191. 

  191. <a class="anchor" id="gafe697d6287719538346bbdf8b1367c59"></a>
    192. 

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

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

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

  195.         <tr>
    196. 

  196.           <td class="memname">GLM_FUNC_DECL genType glm::fastLength </td>
    197. 

  197.           <td>(</td>
    198. 

  198.           <td class="paramtype">genType&#160;</td>
    199. 

  199.           <td class="paramname"><em>x</em></td><td>)</td>
    200. 

  200.           <td></td>
    201. 

  201.         </tr>
    202. 

  202.       </table>
    203. 

  203. </div><div class="memdoc">
    204. 

  204. 

  205. <p>Faster than the common length function but less accurate. </p>
    206. 

  206. <dl class="section see"><dt>See also</dt><dd><a class="el" href="a00194.html" title="Fast but less accurate implementations of square root based functions. ">GLM_GTX_fast_square_root</a> extension. </dd></dl>
    207. 

  207. 

  208. </div>
    209. 

  209. </div>
    210. 

  210. <a class="anchor" id="gae28a3099cbd6404a4ea8ef22147ed7b0"></a>
    211. 

  211. <div class="memitem">
    212. 

  212. <div class="memproto">
    213. 

  213.       <table class="memname">
    214. 

  214.         <tr>
    215. 

  215.           <td class="memname">GLM_FUNC_DECL T glm::fastLength </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>x</em></td><td>)</td>
    219. 

  219.           <td></td>
    220. 

  220.         </tr>
    221. 

  221.       </table>
    222. 

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

  223. 

  224. <p>Faster than the common length function but less accurate. </p>
    225. 

  225. <dl class="section see"><dt>See also</dt><dd><a class="el" href="a00194.html" title="Fast but less accurate implementations of square root based functions. ">GLM_GTX_fast_square_root</a> extension. </dd></dl>
    226. 

  226. 

  227. </div>
    228. 

  228. </div>
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  230. <div class="memitem">
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    232. 

  232.       <table class="memname">
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  233.         <tr>
    234. 

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

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

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

  237.           <td class="paramname"><em>x</em></td><td>)</td>
    238. 

  238.           <td></td>
    239. 

  239.         </tr>
    240. 

  240.       </table>
    241. 

  241. </div><div class="memdoc">
    242. 

  242. 

  243. <p>Faster than the common normalize function but less accurate. </p>
    244. 

  244. <dl class="section see"><dt>See also</dt><dd><a class="el" href="a00194.html" title="Fast but less accurate implementations of square root based functions. ">GLM_GTX_fast_square_root</a> extension. </dd></dl>
    245. 

  245. 

  246. </div>
    247. 

  247. </div>
    248. 

  248. <a class="anchor" id="ga6c460e9414a50b2fc455c8f64c86cdc9"></a>
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  251.       <table class="memname">
    252. 

  252.         <tr>
    253. 

  253.           <td class="memname">GLM_FUNC_DECL genType glm::fastSqrt </td>
    254. 

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

  255.           <td class="paramtype">genType&#160;</td>
    256. 

  256.           <td class="paramname"><em>x</em></td><td>)</td>
    257. 

  257.           <td></td>
    258. 

  258.         </tr>
    259. 

  259.       </table>
    260. 

  260. </div><div class="memdoc">
    261. 

  261. 

  262. <p>Faster than the common sqrt function but less accurate. </p>
    263. 

  263. <dl class="section see"><dt>See also</dt><dd><a class="el" href="a00194.html" title="Fast but less accurate implementations of square root based functions. ">GLM_GTX_fast_square_root</a> extension. </dd></dl>
    264. 

  264. 

  265. </div>
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  266. </div>
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  271.         <tr>
    272. 

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

  273.           <td>(</td>
    274. 

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

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

  276.           <td></td>
    277. 

  277.         </tr>
    278. 

  278.       </table>
    279. 

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

  280. 

  281. <p>Faster than the common sqrt function but less accurate. </p>
    282. 

  282. <dl class="section see"><dt>See also</dt><dd><a class="el" href="a00194.html" title="Fast but less accurate implementations of square root based functions. ">GLM_GTX_fast_square_root</a> extension. </dd></dl>
    283. 

  283. 

  284. </div>
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  285. </div>
    286. 

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    289. 

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