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<title>Castle Game Engine: X3DNodes: Class TAbstractX3DGeometryNode</title>
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<a name="TAbstractX3DGeometryNode"></a><h1 class="cio">Class TAbstractX3DGeometryNode</h1>
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<td><a class="section" href="#PasDoc-Description">Description</a></td><td><a class="section" href="#PasDoc-Hierarchy">Hierarchy</a></td><td>Fields</td><td>Methods</td><td>Properties</td></tr></table>
<a name="PasDoc-Description"></a><h2 class="unit">Unit</h2>
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<a href="X3DNodes.html">X3DNodes</a></p>
<h2 class="declaration">Declaration</h2>
<p class="declaration">
<code>type TAbstractX3DGeometryNode = class(<a class="normal" href="X3DNodes.TAbstractGeometryNode.html">TAbstractGeometryNode</a>)</code></p>
<h2 class="description">Description</h2>
<div class="nodescription">no description available, TAbstractGeometryNode description follows</div><p>
Geometry nodes are the only nodes that produces some visible results during rendering. Much of the VRML language is just a method of describing properties how geometry nodes are displayed (materials, transformations, lighting).
<p>A few things that make geometry node special : </p>
<ul class="paragraph_spacing">
<li><p>Only geometry nodes may have [Local]<a class="normal" href="X3DNodes.TAbstractGeometryNode.html#BoundingBox">BoundingBox</a>.</p></li>
<li><p> Only geometry nodes define something visible "in usual way" during rendering (Some other nodes in VRML / X3D are visible but in an unusual way, like Background and Fog. These nodes must be rendered in a special way — they are not affected in any usual way by the current transformation matrix etc.)</p></li>
<li><p> Geometry nodes are never "grouping nodes", in particular there's never a geometry node that is (direct or indirect) child of another geometry node. So there's no need to be concerned whether geometry nodes' children are included in things like [Local]<a class="normal" href="X3DNodes.TAbstractGeometryNode.html#BoundingBox">BoundingBox</a> or Triangles/<a class="normal" href="X3DNodes.TAbstractGeometryNode.html#VerticesCount">VerticesCount</a>.</p></li>
<li><p> Geometry nodes don't affect anything in graph traverse state. (This is important mostly for VRML 1.0, since in newer VRML / X3D "graph traverse state" is not that important.)</p></li>
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<p>For X3D, this descends from <a class="normal" href="X3DNodes.TAbstractNode.html">TAbstractNode</a>, and <a class="normal" href="X3DNodes.TAbstractX3DGeometryNode.html">TAbstractX3DGeometryNode</a> descends from us. This way in X3D <a class="normal" href="X3DNodes.TAbstractX3DGeometryNode.html">TAbstractX3DGeometryNode</a> descends from this, and also X3D hierarchy is preserved (X3DGeometryNode must descend from X3DNode).</p>
<a name="PasDoc-Hierarchy"></a><h2 class="hierarchy">Hierarchy</h2>
<ul class="hierarchy"><li class="ancestor">TPersistent</li>
<li class="ancestor"><a class="normal" href="CastleInterfaces.TNonRefCountedInterfacedPersistent.html">TNonRefCountedInterfacedPersistent</a></li>
<li class="ancestor"><a class="normal" href="X3DFields.TX3DFileItem.html">TX3DFileItem</a></li>
<li class="ancestor"><a class="normal" href="X3DNodes.TX3DNode.html">TX3DNode</a></li>
<li class="ancestor"><a class="normal" href="X3DNodes.TAbstractNode.html">TAbstractNode</a></li>
<li class="ancestor"><a class="normal" href="X3DNodes.TAbstractGeometryNode.html">TAbstractGeometryNode</a></li>
<li class="thisitem">TAbstractX3DGeometryNode</li></ul><!-- Piwik -->
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