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 <span id="projectnumber">2.3.0</span>
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<div id="projectbrief">A 2D Physics Engine for Games</div>
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<li class="navelem"><a class="el" href="dir_a7f953fea4e008d17e00594b3bbaff29.html">Box2D</a></li><li class="navelem"><a class="el" href="dir_2bb440aa7e31c6a1fa7299279b8cd0fb.html">Common</a></li> </ul>
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<div class="title">b2Settings.h File Reference</div> </div>
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<div class="textblock"><code>#include <stddef.h></code><br />
<code>#include <assert.h></code><br />
<code>#include <float.h></code><br />
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<p><a href="b2_settings_8h_source.html">Go to the source code of this file.</a></p>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structb2_version.html">b2Version</a></td></tr>
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Macros</h2></td></tr>
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#define </td><td class="memItemRight" valign="bottom"><b>B2_NOT_USED</b>(x)   ((void)(x))</td></tr>
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#define </td><td class="memItemRight" valign="bottom"><b>b2Assert</b>(A)   assert(A)</td></tr>
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#define </td><td class="memItemRight" valign="bottom"><b>b2_maxFloat</b>   FLT_MAX</td></tr>
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#define </td><td class="memItemRight" valign="bottom"><b>b2_epsilon</b>   FLT_EPSILON</td></tr>
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#define </td><td class="memItemRight" valign="bottom"><b>b2_pi</b>   3.14159265359f</td></tr>
<tr class="separator:a3f1872f3fc3c46abc809e7f7d467eb6c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa5f44cc9edf711433dea2b2ec94f3c42"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#aa5f44cc9edf711433dea2b2ec94f3c42">b2_maxManifoldPoints</a>   2</td></tr>
<tr class="separator:aa5f44cc9edf711433dea2b2ec94f3c42"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a09d71ee1993bee28b5b2e6d893b41884"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a09d71ee1993bee28b5b2e6d893b41884">b2_maxPolygonVertices</a>   8</td></tr>
<tr class="separator:a09d71ee1993bee28b5b2e6d893b41884"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:adb86e231496fdd6ac7795ce58d40c870"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#adb86e231496fdd6ac7795ce58d40c870">b2_aabbExtension</a>   0.1f</td></tr>
<tr class="separator:adb86e231496fdd6ac7795ce58d40c870"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a7d1bd1594f20601d4079bccbd0a6a03c"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a7d1bd1594f20601d4079bccbd0a6a03c">b2_aabbMultiplier</a>   2.0f</td></tr>
<tr class="separator:a7d1bd1594f20601d4079bccbd0a6a03c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a57268ade379c5c3373d0ff558b0350cf"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a57268ade379c5c3373d0ff558b0350cf">b2_linearSlop</a>   0.005f</td></tr>
<tr class="separator:a57268ade379c5c3373d0ff558b0350cf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a67810fb101bb7a7e0b3afc14845383ee"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a67810fb101bb7a7e0b3afc14845383ee">b2_angularSlop</a>   (2.0f / 180.0f * b2_pi)</td></tr>
<tr class="separator:a67810fb101bb7a7e0b3afc14845383ee"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:afc0f934dabffb1e83e081249133ad860"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#afc0f934dabffb1e83e081249133ad860">b2_polygonRadius</a>   (2.0f * b2_linearSlop)</td></tr>
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<tr class="memitem:ac1fd56e39ab8499f344b6398b7332e55"><td class="memItemLeft" align="right" valign="top"><a id="ac1fd56e39ab8499f344b6398b7332e55"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#ac1fd56e39ab8499f344b6398b7332e55">b2_maxSubSteps</a>   8</td></tr>
<tr class="memdesc:ac1fd56e39ab8499f344b6398b7332e55"><td class="mdescLeft"> </td><td class="mdescRight">Maximum number of sub-steps per contact in continuous physics simulation. <br /></td></tr>
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<tr class="memitem:aad3a54bcae5f7ec0235963403c2fccc9"><td class="memItemLeft" align="right" valign="top"><a id="aad3a54bcae5f7ec0235963403c2fccc9"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#aad3a54bcae5f7ec0235963403c2fccc9">b2_maxTOIContacts</a>   32</td></tr>
<tr class="memdesc:aad3a54bcae5f7ec0235963403c2fccc9"><td class="mdescLeft"> </td><td class="mdescRight">Maximum number of contacts to be handled to solve a TOI impact. <br /></td></tr>
<tr class="separator:aad3a54bcae5f7ec0235963403c2fccc9"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a690b448aa2dba2a1393781f8c059c22a"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a690b448aa2dba2a1393781f8c059c22a">b2_velocityThreshold</a>   1.0f</td></tr>
<tr class="separator:a690b448aa2dba2a1393781f8c059c22a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a23ab70e4809f5ee23abcd52018d5eb88"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a23ab70e4809f5ee23abcd52018d5eb88">b2_maxLinearCorrection</a>   0.2f</td></tr>
<tr class="separator:a23ab70e4809f5ee23abcd52018d5eb88"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a823e4f9a6fa4b9de3c97da696571400a"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a823e4f9a6fa4b9de3c97da696571400a">b2_maxAngularCorrection</a>   (8.0f / 180.0f * b2_pi)</td></tr>
<tr class="separator:a823e4f9a6fa4b9de3c97da696571400a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af2bad257bfbafed3665df3e243ba2b52"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#af2bad257bfbafed3665df3e243ba2b52">b2_maxTranslation</a>   2.0f</td></tr>
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<tr class="memitem:a06db101442fde26e8ffb875af5c2f588"><td class="memItemLeft" align="right" valign="top"><a id="a06db101442fde26e8ffb875af5c2f588"></a>
#define </td><td class="memItemRight" valign="bottom"><b>b2_maxTranslationSquared</b>   (<a class="el" href="b2_settings_8h.html#af2bad257bfbafed3665df3e243ba2b52">b2_maxTranslation</a> * <a class="el" href="b2_settings_8h.html#af2bad257bfbafed3665df3e243ba2b52">b2_maxTranslation</a>)</td></tr>
<tr class="separator:a06db101442fde26e8ffb875af5c2f588"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5808c5f1e946205d8f7458101ccc698e"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a5808c5f1e946205d8f7458101ccc698e">b2_maxRotation</a>   (0.5f * b2_pi)</td></tr>
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#define </td><td class="memItemRight" valign="bottom"><b>b2_maxRotationSquared</b>   (<a class="el" href="b2_settings_8h.html#a5808c5f1e946205d8f7458101ccc698e">b2_maxRotation</a> * <a class="el" href="b2_settings_8h.html#a5808c5f1e946205d8f7458101ccc698e">b2_maxRotation</a>)</td></tr>
<tr class="separator:ac0ea425673819f24093ef7875c1025dd"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a88e32539e0f9e69e3832e1321eba3caa"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a88e32539e0f9e69e3832e1321eba3caa">b2_baumgarte</a>   0.2f</td></tr>
<tr class="separator:a88e32539e0f9e69e3832e1321eba3caa"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:addf67cb7c89ad8a0370b488e8120a6ed"><td class="memItemLeft" align="right" valign="top"><a id="addf67cb7c89ad8a0370b488e8120a6ed"></a>
#define </td><td class="memItemRight" valign="bottom"><b>b2_toiBaugarte</b>   0.75f</td></tr>
<tr class="separator:addf67cb7c89ad8a0370b488e8120a6ed"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab021adb740e4a5e1f5f7d9913ed94781"><td class="memItemLeft" align="right" valign="top"><a id="ab021adb740e4a5e1f5f7d9913ed94781"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#ab021adb740e4a5e1f5f7d9913ed94781">b2_timeToSleep</a>   0.5f</td></tr>
<tr class="memdesc:ab021adb740e4a5e1f5f7d9913ed94781"><td class="mdescLeft"> </td><td class="mdescRight">The time that a body must be still before it will go to sleep. <br /></td></tr>
<tr class="separator:ab021adb740e4a5e1f5f7d9913ed94781"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6d882c48142a8c73011b576e20dc6dd8"><td class="memItemLeft" align="right" valign="top"><a id="a6d882c48142a8c73011b576e20dc6dd8"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a6d882c48142a8c73011b576e20dc6dd8">b2_linearSleepTolerance</a>   0.01f</td></tr>
<tr class="memdesc:a6d882c48142a8c73011b576e20dc6dd8"><td class="mdescLeft"> </td><td class="mdescRight">A body cannot sleep if its linear velocity is above this tolerance. <br /></td></tr>
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<tr class="memitem:a571f3e7c864aca14141b163205600eef"><td class="memItemLeft" align="right" valign="top"><a id="a571f3e7c864aca14141b163205600eef"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a571f3e7c864aca14141b163205600eef">b2_angularSleepTolerance</a>   (2.0f / 180.0f * b2_pi)</td></tr>
<tr class="memdesc:a571f3e7c864aca14141b163205600eef"><td class="mdescLeft"> </td><td class="mdescRight">A body cannot sleep if its angular velocity is above this tolerance. <br /></td></tr>
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Typedefs</h2></td></tr>
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typedef signed char </td><td class="memItemRight" valign="bottom"><b>int8</b></td></tr>
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typedef signed short </td><td class="memItemRight" valign="bottom"><b>int16</b></td></tr>
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typedef signed int </td><td class="memItemRight" valign="bottom"><b>int32</b></td></tr>
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typedef unsigned char </td><td class="memItemRight" valign="bottom"><b>uint8</b></td></tr>
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typedef unsigned short </td><td class="memItemRight" valign="bottom"><b>uint16</b></td></tr>
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typedef unsigned int </td><td class="memItemRight" valign="bottom"><b>uint32</b></td></tr>
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typedef float </td><td class="memItemRight" valign="bottom"><b>float32</b></td></tr>
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typedef double </td><td class="memItemRight" valign="bottom"><b>float64</b></td></tr>
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Functions</h2></td></tr>
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void * </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a2dca9b286e9b9d6d022055fd61534bd7">b2Alloc</a> (int32 size)</td></tr>
<tr class="memdesc:a2dca9b286e9b9d6d022055fd61534bd7"><td class="mdescLeft"> </td><td class="mdescRight">Implement this function to use your own memory allocator. <br /></td></tr>
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a50f4abf5edeabd0300946edbd542e24d">b2Free</a> (void *mem)</td></tr>
<tr class="memdesc:a50f4abf5edeabd0300946edbd542e24d"><td class="mdescLeft"> </td><td class="mdescRight">If you implement b2Alloc, you should also implement this function. <br /></td></tr>
<tr class="separator:a50f4abf5edeabd0300946edbd542e24d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9f10095d05c74eebfe535931c9061ab2"><td class="memItemLeft" align="right" valign="top"><a id="a9f10095d05c74eebfe535931c9061ab2"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a9f10095d05c74eebfe535931c9061ab2">b2Log</a> (const char *string,...)</td></tr>
<tr class="memdesc:a9f10095d05c74eebfe535931c9061ab2"><td class="mdescLeft"> </td><td class="mdescRight">Logging function. <br /></td></tr>
<tr class="separator:a9f10095d05c74eebfe535931c9061ab2"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="var-members"></a>
Variables</h2></td></tr>
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<a class="el" href="structb2_version.html">b2Version</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_settings_8h.html#a3a20e3b6a8b05633d911fea031f7a44f">b2_version</a></td></tr>
<tr class="memdesc:a3a20e3b6a8b05633d911fea031f7a44f"><td class="mdescLeft"> </td><td class="mdescRight">Current version. <br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Global tuning constants based on meters-kilograms-seconds (MKS) units. </p>
</div><h2 class="groupheader">Macro Definition Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#adb86e231496fdd6ac7795ce58d40c870">◆ </a></span>b2_aabbExtension</h2>
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<td class="memname">#define b2_aabbExtension   0.1f</td>
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<p>This is used to fatten AABBs in the dynamic tree. This allows proxies to move by a small amount without triggering a tree adjustment. This is in meters. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a7d1bd1594f20601d4079bccbd0a6a03c">◆ </a></span>b2_aabbMultiplier</h2>
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<td class="memname">#define b2_aabbMultiplier   2.0f</td>
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<p>This is used to fatten AABBs in the dynamic tree. This is used to predict the future position based on the current displacement. This is a dimensionless multiplier. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a67810fb101bb7a7e0b3afc14845383ee">◆ </a></span>b2_angularSlop</h2>
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<td class="memname">#define b2_angularSlop   (2.0f / 180.0f * b2_pi)</td>
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<p>A small angle used as a collision and constraint tolerance. Usually it is chosen to be numerically significant, but visually insignificant. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a88e32539e0f9e69e3832e1321eba3caa">◆ </a></span>b2_baumgarte</h2>
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<td class="memname">#define b2_baumgarte   0.2f</td>
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<p>This scale factor controls how fast overlap is resolved. Ideally this would be 1 so that overlap is removed in one time step. However using values close to 1 often lead to overshoot. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a57268ade379c5c3373d0ff558b0350cf">◆ </a></span>b2_linearSlop</h2>
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<td class="memname">#define b2_linearSlop   0.005f</td>
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<p>A small length used as a collision and constraint tolerance. Usually it is chosen to be numerically significant, but visually insignificant. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a823e4f9a6fa4b9de3c97da696571400a">◆ </a></span>b2_maxAngularCorrection</h2>
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<td class="memname">#define b2_maxAngularCorrection   (8.0f / 180.0f * b2_pi)</td>
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<p>The maximum angular position correction used when solving constraints. This helps to prevent overshoot. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a23ab70e4809f5ee23abcd52018d5eb88">◆ </a></span>b2_maxLinearCorrection</h2>
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<td class="memname">#define b2_maxLinearCorrection   0.2f</td>
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<p>The maximum linear position correction used when solving constraints. This helps to prevent overshoot. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#aa5f44cc9edf711433dea2b2ec94f3c42">◆ </a></span>b2_maxManifoldPoints</h2>
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<td class="memname">#define b2_maxManifoldPoints   2</td>
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<p>The maximum number of contact points between two convex shapes. Do not change this value. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a09d71ee1993bee28b5b2e6d893b41884">◆ </a></span>b2_maxPolygonVertices</h2>
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<td class="memname">#define b2_maxPolygonVertices   8</td>
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<p>The maximum number of vertices on a convex polygon. You cannot increase this too much because <a class="el" href="classb2_block_allocator.html">b2BlockAllocator</a> has a maximum object size. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a5808c5f1e946205d8f7458101ccc698e">◆ </a></span>b2_maxRotation</h2>
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<td class="memname">#define b2_maxRotation   (0.5f * b2_pi)</td>
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<p>The maximum angular velocity of a body. This limit is very large and is used to prevent numerical problems. You shouldn't need to adjust this. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#af2bad257bfbafed3665df3e243ba2b52">◆ </a></span>b2_maxTranslation</h2>
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<td class="memname">#define b2_maxTranslation   2.0f</td>
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<p>The maximum linear velocity of a body. This limit is very large and is used to prevent numerical problems. You shouldn't need to adjust this. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#afc0f934dabffb1e83e081249133ad860">◆ </a></span>b2_polygonRadius</h2>
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<td class="memname">#define b2_polygonRadius   (2.0f * b2_linearSlop)</td>
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<p>The radius of the polygon/edge shape skin. This should not be modified. Making this smaller means polygons will have an insufficient buffer for continuous collision. Making it larger may create artifacts for vertex collision. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a690b448aa2dba2a1393781f8c059c22a">◆ </a></span>b2_velocityThreshold</h2>
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<td class="memname">#define b2_velocityThreshold   1.0f</td>
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<p>A velocity threshold for elastic collisions. Any collision with a relative linear velocity below this threshold will be treated as inelastic. </p>
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