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<h1>openvrml::frustum Class Reference</h1>A view frustum.
<a href="#_details">More...</a>
<p>
<a href="classopenvrml_1_1frustum-members.html">List of all members.</a><table border=0 cellpadding=0 cellspacing=0>
<tr><td></td></tr>
<tr><td colspan=2><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top> </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1frustum.html#a0">frustum</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Construct a default frustum. <a href="#a0"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top> </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1frustum.html#a1">frustum</a> (float <a class="el" href="classopenvrml_1_1frustum.html#o0">fovy</a>, float aspect, double near, double far)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Construct and initialize a frustum. <a href="#a1"></a><br><br></td></tr>
<tr><td colspan=2><br><h2>Public Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="o0" doxytag="openvrml::frustum::fovy" ></a>
float </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1frustum.html#o0">fovy</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Vertical field of view. <br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="o1" doxytag="openvrml::frustum::fovx" ></a>
float </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1frustum.html#o1">fovx</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Horizontal field of view. <br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="o2" doxytag="openvrml::frustum::z_near" ></a>
double </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1frustum.html#o2">z_near</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Distance to the near clipping plane. <br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="o3" doxytag="openvrml::frustum::z_far" ></a>
double </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1frustum.html#o3">z_far</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Distance to the far clipping plane. <br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>float </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1frustum.html#o4">left_plane</a> [4]</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Left (looking down -z) side clip plane. <a href="#o4"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="o5" doxytag="openvrml::frustum::right_plane" ></a>
float </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1frustum.html#o5">right_plane</a> [4]</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Right clipping plane. <br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="o6" doxytag="openvrml::frustum::top_plane" ></a>
float </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1frustum.html#o6">top_plane</a> [4]</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Top clipping plane. <br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="o7" doxytag="openvrml::frustum::bot_plane" ></a>
float </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1frustum.html#o7">bot_plane</a> [4]</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Bottom clipping plane. <br><br></td></tr>
<tr><td colspan=2><br><h2>Private Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1frustum.html#d0">update</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Update the plane equations. <a href="#d0"></a><br><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
A view frustum.
<p>
A frustum is more or less a truncated pyramid. This class represents frustums with their wide end facing down the -z axis, and their (theoretical) tip at the origin. A frustum is a convenient representation of the volume of virtual space visible through the on-screen window when using a perspective projection.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="classopenvrml_1_1node.html#a67">node::render</a> <p>
<a class="el" href="classopenvrml_1_1viewer.html">viewer</a> </dd></dl>
<p>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="a0" doxytag="openvrml::frustum::frustum" ></a><p>
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<td class="md" nowrap valign="top"> openvrml::frustum::frustum </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
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<p>
Construct a default frustum.
<p>
fovy, fovx, near and far all get set to -1. </td>
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<a class="anchor" name="a1" doxytag="openvrml::frustum::frustum" ></a><p>
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<td class="md" nowrap valign="top"> openvrml::frustum::frustum </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">float </td>
<td class="mdname" nowrap> <em>fovy</em>, </td>
</tr>
<tr>
<td></td>
<td></td>
<td class="md" nowrap>float </td>
<td class="mdname" nowrap> <em>aspect</em>, </td>
</tr>
<tr>
<td></td>
<td></td>
<td class="md" nowrap>double </td>
<td class="mdname" nowrap> <em>near</em>, </td>
</tr>
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<td></td>
<td></td>
<td class="md" nowrap>double </td>
<td class="mdname" nowrap> <em>far</em></td>
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<td></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
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</td>
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<p>
Construct and initialize a frustum.
<p>
The field of view should be less than 180 degrees. Extreme aspect ratios are unlikely to work well. The near and far plane distances are always positive (think distance, not position). anear must be less than afar. This is supposed to look like gluPerspective.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>fovy</em> </td><td>vertical field of view in degrees. </td></tr>
<tr><td valign=top><em>aspect</em> </td><td>ratio of view width to height (not the ratio of the horizontal to vertial field-of-views). </td></tr>
<tr><td valign=top><em>near</em> </td><td>distance to near clip plane. </td></tr>
<tr><td valign=top><em>far</em> </td><td>distance to far clip plane. </td></tr>
</table>
</dl>
</td>
</tr>
</table>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="d0" doxytag="openvrml::frustum::update" ></a><p>
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<td class="md" nowrap valign="top"> void openvrml::frustum::update </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [private]</code></td>
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</td>
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<td>
</td>
<td>
<p>
Update the plane equations.
<p>
The plane equations are derived from the other members. </td>
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<hr><h2>Member Data Documentation</h2>
<a class="anchor" name="o4" doxytag="openvrml::frustum::left_plane" ></a><p>
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<td class="md" nowrap valign="top"> <a class="el" href="classopenvrml_1_1frustum.html#o4">openvrml::frustum::left_plane</a>
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</td>
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<td>
</td>
<td>
<p>
Left (looking down -z) side clip plane.
<p>
Format is (a,b,c,d) where (a,b,c) is the plane normal and d is the plane offset. For the momement the eyepoint is always the origin, so d is going to be 0. </td>
</tr>
</table>
</div>
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