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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
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<title>Castle Game Engine: CastleFrustum</title>
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<h2>Castle Game Engine</h2><p><a href="introduction.html" class="navigation">Introduction</a></p><p><a href="AllUnits.html" class="navigation">Units</a></p><p><a href="ClassHierarchy.html" class="navigation">Class Hierarchy</a></p><p><a href="AllClasses.html" class="navigation">Classes, Interfaces, Objects and Records</a></p><p><a href="AllTypes.html" class="navigation">Types</a></p><p><a href="AllVariables.html" class="navigation">Variables</a></p><p><a href="AllConstants.html" class="navigation">Constants</a></p><p><a href="AllFunctions.html" class="navigation">Functions and Procedures</a></p><p><a href="AllIdentifiers.html" class="navigation">Identifiers</a></p></td><td class="content">
<h1 class="unit">Unit CastleFrustum</h1>
<table class="sections wide_list">
<tr>
<td><a class="section" href="#PasDoc-Description">Description</a></td><td><a class="section" href="#PasDoc-Uses">Uses</a></td><td><a class="section" href="#PasDoc-Classes">Classes, Interfaces, Objects and Records</a></td><td>Functions and Procedures</td><td><a class="section" href="#PasDoc-Types">Types</a></td><td><a class="section" href="#PasDoc-Constants">Constants</a></td><td>Variables</td></tr></table>
<a name="PasDoc-Description"></a><h2 class="description">Description</h2>
<p>
Frustum object (<a class="normal" href="CastleFrustum.TFrustum.html">TFrustum</a>) and helpers.</p>
<a name="PasDoc-Uses"></a><h2 class="uses">Uses</h2>
<ul class="useslist"><li><a href="CastleVectors.html">CastleVectors</a></li><li><a href="CastleBoxes.html">CastleBoxes</a></li></ul><h2 class="overview">Overview</h2>
<a name="PasDoc-Classes"></a><h3 class="cio">Classes, Interfaces, Objects and Records</h3>
<table class="classestable wide_list">
<tr class="listheader">
<th class="itemname">Name</th>
<th class="itemdesc">Description</th>
</tr>
<tr class="list">
<td class="itemname">Object <a class="bold" href="CastleFrustum.TFrustum.html"><code>TFrustum</code></a></td>
<td class="itemdesc">Viewing frustum, defined as 6 plane equations.</td>
</tr>
</table>
<a name="PasDoc-Types"></a><h3 class="summary">Types</h3>
<table class="summary wide_list">
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<td class="itemcode"><code><b><a href="CastleFrustum.html#TFrustumPlane">TFrustumPlane</a></b> = (...);</code></td>
</tr>
<tr class="list2">
<td class="itemcode"><code><b><a href="CastleFrustum.html#TFrustumPointsSingle">TFrustumPointsSingle</a></b> = packed array [0..7] of packed record
case Integer of
0: (XYZ: <a href="CastleVectors.html#TVector3Single">TVector3Single</a>; W: Single);
1: (XYZW: <a href="CastleVectors.html#TVector4Single">TVector4Single</a>);
end;</code></td>
</tr>
<tr class="list">
<td class="itemcode"><code><b><a href="CastleFrustum.html#TFrustumPointsDouble">TFrustumPointsDouble</a></b> = packed array [0..7] of packed record
case Integer of
0: (XYZ: <a href="CastleVectors.html#TVector3Double">TVector3Double</a>; W: Double);
1: (XYZW: <a href="CastleVectors.html#TVector4Double">TVector4Double</a>);
end;</code></td>
</tr>
<tr class="list2">
<td class="itemcode"><code><b><a href="CastleFrustum.html#TFrustumCollisionPossible">TFrustumCollisionPossible</a></b> = (...);</code></td>
</tr>
<tr class="list">
<td class="itemcode"><code><b><a href="CastleFrustum.html#PFrustum">PFrustum</a></b> = ˆ<a href="CastleFrustum.TFrustum.html">TFrustum</a>;</code></td>
</tr>
</table>
<a name="PasDoc-Constants"></a><h3 class="summary">Constants</h3>
<table class="summary wide_list">
<tr class="list">
<td class="itemcode"><code><b><a href="CastleFrustum.html#FrustumPointsQuadsIndexes">FrustumPointsQuadsIndexes</a></b>: array[<a href="CastleFrustum.html#TFrustumPlane">TFrustumPlane</a>, 0..3]of LongWord =
( (0, 3, 7, 4),
(1, 2, 6, 5),
(2, 3, 7, 6),
(0, 1, 5, 4),
(0, 1, 2, 3),
(4, 5, 6, 7) );</code></td>
</tr>
<tr class="list2">
<td class="itemcode"><code><b><a href="CastleFrustum.html#FrustumPointsLinesIndexes">FrustumPointsLinesIndexes</a></b>: array[0..11, 0..1]of LongWord =
( (0, 1), (1, 2), (2, 3), (3, 0),
(4, 5), (5, 6), (6, 7), (7, 4),
(0, 4), (1, 5), (2, 6), (3, 7)
);</code></td>
</tr>
</table>
<h2 class="description">Description</h2>
<h3 class="detail">Types</h3>
<table class="detail wide_list">
<tr class="list">
<td class="itemcode"><a name="TFrustumPlane"></a><code><b>TFrustumPlane</b> = (...);</code></td>
</tr>
<tr><td colspan="1">
<p>
Order of planes of <a class="normal" href="CastleFrustum.TFrustum.html">TFrustum</a>.
<p>(This order is the same as the order of params to procedure <a class="normal" href="CastleVectors.html#FrustumProjMatrix">FrustumProjMatrix</a> and OpenGL's glFrustum routine. Article [<a href="http://www2.ravensoft.com/users/ggribb/plane%20extraction.pdf">http://www2.ravensoft.com/users/ggribb/plane%20extraction.pdf</a>] has swapped bottom and top positions).</p>
<h6 class="description_section">Values</h6>
<ul>
<li>
fpLeft: </li>
<li>
fpRight: </li>
<li>
fpBottom: </li>
<li>
fpTop: </li>
<li>
fpNear: </li>
<li>
fpFar: </li>
</ul>
</td></tr>
</table>
<table class="detail wide_list">
<tr class="list">
<td class="itemcode"><a name="TFrustumPointsSingle"></a><code><b>TFrustumPointsSingle</b> = packed array [0..7] of packed record
case Integer of
0: (XYZ: <a href="CastleVectors.html#TVector3Single">TVector3Single</a>; W: Single);
1: (XYZW: <a href="CastleVectors.html#TVector4Single">TVector4Single</a>);
end;</code></td>
</tr>
<tr><td colspan="1">
</td></tr>
</table>
<table class="detail wide_list">
<tr class="list">
<td class="itemcode"><a name="TFrustumPointsDouble"></a><code><b>TFrustumPointsDouble</b> = packed array [0..7] of packed record
case Integer of
0: (XYZ: <a href="CastleVectors.html#TVector3Double">TVector3Double</a>; W: Double);
1: (XYZW: <a href="CastleVectors.html#TVector4Double">TVector4Double</a>);
end;</code></td>
</tr>
<tr><td colspan="1">
</td></tr>
</table>
<table class="detail wide_list">
<tr class="list">
<td class="itemcode"><a name="TFrustumCollisionPossible"></a><code><b>TFrustumCollisionPossible</b> = (...);</code></td>
</tr>
<tr><td colspan="1">
<p>
See <a class="normal" href="CastleFrustum.TFrustum.html#SphereCollisionPossible">TFrustum.SphereCollisionPossible</a> for description what each value of this type means.</p>
<h6 class="description_section">Values</h6>
<ul>
<li>
fcNoCollision: </li>
<li>
fcSomeCollisionPossible: </li>
<li>
fcInsideFrustum: </li>
</ul>
</td></tr>
</table>
<table class="detail wide_list">
<tr class="list">
<td class="itemcode"><a name="PFrustum"></a><code><b>PFrustum</b> = ˆ<a href="CastleFrustum.TFrustum.html">TFrustum</a>;</code></td>
</tr>
<tr><td colspan="1">
</td></tr>
</table>
<h3 class="detail">Constants</h3>
<table class="detail wide_list">
<tr class="list">
<td class="itemcode"><a name="FrustumPointsQuadsIndexes"></a><code><b>FrustumPointsQuadsIndexes</b>: array[<a href="CastleFrustum.html#TFrustumPlane">TFrustumPlane</a>, 0..3]of LongWord =
( (0, 3, 7, 4),
(1, 2, 6, 5),
(2, 3, 7, 6),
(0, 1, 5, 4),
(0, 1, 2, 3),
(4, 5, 6, 7) );</code></td>
</tr>
<tr><td colspan="1">
</td></tr>
</table>
<table class="detail wide_list">
<tr class="list">
<td class="itemcode"><a name="FrustumPointsLinesIndexes"></a><code><b>FrustumPointsLinesIndexes</b>: array[0..11, 0..1]of LongWord =
( (0, 1), (1, 2), (2, 3), (3, 0),
(4, 5), (5, 6), (6, 7), (7, 4),
(0, 4), (1, 5), (2, 6), (3, 7)
);</code></td>
</tr>
<tr><td colspan="1">
<p>
Useful if you want to draw frustum obtained from <a class="normal" href="CastleFrustum.TFrustum.html#CalculatePoints">TFrustum.CalculatePoints</a>.
<p>It's guaranteed that the first 4 items touch only the first 4 (near plane) points of the frustum — useful if you want to draw only the near plane rect. For <a class="normal" href="CastleVectors.html#ZFarInfinity">ZFarInfinity</a>, other points may be in infinity.</p>
</td></tr>
</table>
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