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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: X3DShadowMaps</title>
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<h1 class="unit">Unit X3DShadowMaps</h1>
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<td><a class="section" href="#PasDoc-Description">Description</a></td><td><a class="section" href="#PasDoc-Uses">Uses</a></td><td>Classes, Interfaces, Objects and Records</td><td><a class="section" href="#PasDoc-FuncsProcs">Functions and Procedures</a></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>
Shadow maps internal utilities.</p>
<a name="PasDoc-Uses"></a><h2 class="uses">Uses</h2>
<ul class="useslist"><li><a href="X3DNodes.html">X3DNodes</a></li><li><a href="CastleShapes.html">CastleShapes</a></li></ul><h2 class="overview">Overview</h2>
<a name="PasDoc-FuncsProcs"></a><h3 class="summary">Functions and Procedures</h3>
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<td class="itemcode"><code>procedure <b><a href="X3DShadowMaps.html#ProcessShadowMapsReceivers">ProcessShadowMapsReceivers</a></b>(Model: <a href="X3DNodes.TX3DNode.html">TX3DNode</a>; Shapes: <a href="CastleShapes.TShapeTree.html">TShapeTree</a>; const Enable: boolean; const DefaultShadowMapSize: Cardinal);</code></td>
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<a name="PasDoc-Types"></a><h3 class="summary">Types</h3>
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<td class="itemcode"><code><b><a href="X3DShadowMaps.html#TShadowSampling">TShadowSampling</a></b> = (...);</code></td>
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<a name="PasDoc-Constants"></a><h3 class="summary">Constants</h3>
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<td class="itemcode"><code><b><a href="X3DShadowMaps.html#ShadowSamplingNames">ShadowSamplingNames</a></b>: array [<a href="X3DShadowMaps.html#TShadowSampling">TShadowSampling</a>] of string =
( 'Simple', 'PCF 4', 'PCF 4 Bilinear', 'PCF 16', 'Variance Shadow Maps (Experimental)' );</code></td>
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<tr class="list2">
<td class="itemcode"><code><b><a href="X3DShadowMaps.html#DefaultShadowSampling">DefaultShadowSampling</a></b> = ssPCF16;</code></td>
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<h2 class="description">Description</h2>
<h3 class="detail">Functions and Procedures</h3>
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<td class="itemcode"><a name="ProcessShadowMapsReceivers"></a><code>procedure <b>ProcessShadowMapsReceivers</b>(Model: <a href="X3DNodes.TX3DNode.html">TX3DNode</a>; Shapes: <a href="CastleShapes.TShapeTree.html">TShapeTree</a>; const Enable: boolean; const DefaultShadowMapSize: Cardinal);</code></td>
</tr>
<tr><td colspan="1">
<p>
Automatically handle VRML/X3D "receiveShadows" field by inserting appropriate lower-level nodes.
<p>If Enable is <code>True</code>, the appropriate lower-level nodes are added, or replaced (if they already existed, because you call <code>ProcessShadowMapsReceivers</code> again). If Enable is <code>False</code>, the appropriate nodes (added by previous calls to <code>ProcessShadowMapsReceivers</code>) will be removed instead.
<p>For each shape with "receiveShadows", we: </p>
<ol class="paragraph_spacing">
<li value="1"><p>extend it's "texture" field with appropriate GeneratedShadowMap,</p></li>
<li value="2"><p>extend it's "texCoord" field with appropriate ProjectedTextureCoordinate,</p></li>
</ol>
<p></p>
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<h3 class="detail">Types</h3>
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<td class="itemcode"><a name="TShadowSampling"></a><code><b>TShadowSampling</b> = (...);</code></td>
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<h6 class="description_section">Values</h6>
<ul>
<li>
ssSimple: </li>
<li>
ssPCF4: Percentage Closer Filtering improve shadow maps look, by sampling the depth map a couple of times. They also make shadow more blurry (increase shadow map size to counteract this), and a little slower. They may also introduce new artifacts (due to bad interaction with the "polygon offset" of shadow map).</li>
<li>
ssPCF4Bilinear: </li>
<li>
ssPCF16: </li>
<li>
ssVarianceShadowMaps: Variance Shadow Maps, see <a href="http://www.punkuser.net/vsm/">http://www.punkuser.net/vsm/</a> . This may generally produce superior results, as shadow maps can be then filtered like normal textures (bilinear, mipmaps, anisotropic filtering). So shadows look much nicer from very close and very far distances. However, this requires new GPU, and may cause artifacts on some scenes.</li>
</ul>
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<h3 class="detail">Constants</h3>
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<td class="itemcode"><a name="ShadowSamplingNames"></a><code><b>ShadowSamplingNames</b>: array [<a href="X3DShadowMaps.html#TShadowSampling">TShadowSampling</a>] of string =
( 'Simple', 'PCF 4', 'PCF 4 Bilinear', 'PCF 16', 'Variance Shadow Maps (Experimental)' );</code></td>
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<td class="itemcode"><a name="DefaultShadowSampling"></a><code><b>DefaultShadowSampling</b> = ssPCF16;</code></td>
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