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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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<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">
<a name="TSceneRenderingAttributes"></a><h1 class="cio">Class TSceneRenderingAttributes</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><a class="section" href="#PasDoc-Fields">Fields</a></td><td><a class="section" href="#PasDoc-Methods">Methods</a></td><td><a class="section" href="#PasDoc-Properties">Properties</a></td></tr></table>
<a name="PasDoc-Description"></a><h2 class="unit">Unit</h2>
<p class="unitlink">
<a href="CastleScene.html">CastleScene</a></p>
<h2 class="declaration">Declaration</h2>
<p class="declaration">
<code>type TSceneRenderingAttributes = class(<a class="normal" href="CastleRenderer.TRenderingAttributes.html">TRenderingAttributes</a>)</code></p>
<h2 class="description">Description</h2>
<div class="nodescription">no description available, TRenderingAttributes description follows</div><p>
Various properties that control rendering done with <a class="normal" href="CastleRenderer.TGLRenderer.html">TGLRenderer</a>.
<p>They are collected here, in a class separate from <a class="normal" href="CastleRenderer.TGLRenderer.html">TGLRenderer</a>, because various things (like <a class="normal" href="CastleScene.TCastleScene.html">TCastleScene</a> and <a class="normal" href="CastlePrecalculatedAnimation.TCastlePrecalculatedAnimation.html">TCastlePrecalculatedAnimation</a>) wrap <a class="normal" href="CastleRenderer.TGLRenderer.html">TGLRenderer</a> instances and hide it, but still they want to allow user to change these attributes.</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="CastleRenderer.TRenderingAttributes.html">TRenderingAttributes</a></li>
<li class="thisitem">TSceneRenderingAttributes</li></ul><h2 class="overview">Overview</h2>
<a name="PasDoc-Fields"></a><h3 class="summary">Fields</h3>
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<td class="itemcode"><code>internal const <b><a href="CastleScene.TSceneRenderingAttributes.html#DefaultBlendingSourceFactor">DefaultBlendingSourceFactor</a></b> = GL_SRC_ALPHA;</code></td>
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<td class="itemcode"><code>internal const <b><a href="CastleScene.TSceneRenderingAttributes.html#DefaultBlendingDestinationFactor">DefaultBlendingDestinationFactor</a></b> = GL_ONE_MINUS_SRC_ALPHA;</code></td>
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<td class="itemcode"><code>internal const <b><a href="CastleScene.TSceneRenderingAttributes.html#DefaultBlendingSort">DefaultBlendingSort</a></b> = bsNone;</code></td>
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<td class="itemcode"><code>internal const <b><a href="CastleScene.TSceneRenderingAttributes.html#DefaultWireframeColor">DefaultWireframeColor</a></b>: <a href="CastleVectors.html#TVector3Single">TVector3Single</a> = (0, 0, 0);</code></td>
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<td class="itemcode"><code>internal const <b><a href="CastleScene.TSceneRenderingAttributes.html#DefaultSolidWireframeScale">DefaultSolidWireframeScale</a></b> = 1;</code></td>
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<td class="itemcode"><code>internal const <b><a href="CastleScene.TSceneRenderingAttributes.html#DefaultSolidWireframeBias">DefaultSolidWireframeBias</a></b> = 1;</code></td>
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<td class="itemcode"><code>internal const <b><a href="CastleScene.TSceneRenderingAttributes.html#DefaultSilhouetteScale">DefaultSilhouetteScale</a></b> = 5;</code></td>
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<td class="itemcode"><code>internal const <b><a href="CastleScene.TSceneRenderingAttributes.html#DefaultSilhouetteBias">DefaultSilhouetteBias</a></b> = 5;</code></td>
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<td class="itemcode"><code>var <b><a href="CastleScene.TSceneRenderingAttributes.html#OnCreate">OnCreate</a></b>: <a href="CastleScene.html#TRenderingAttributesEvent">TRenderingAttributesEvent</a>; static;</code></td>
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<a name="PasDoc-Methods"></a><h3 class="summary">Methods</h3>
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<td class="itemcode"><code>procedure <b><a href="CastleScene.TSceneRenderingAttributes.html#ReleaseCachedResources">ReleaseCachedResources</a></b>; override;</code></td>
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<td class="itemcode"><code>procedure <b><a href="CastleScene.TSceneRenderingAttributes.html#SetBlending">SetBlending</a></b>(const Value: boolean); virtual;</code></td>
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<td class="itemcode"><code>procedure <b><a href="CastleScene.TSceneRenderingAttributes.html#SetBlendingSourceFactor">SetBlendingSourceFactor</a></b>(const Value: <a href="CastleGLUtils.html#TGLenum">TGLenum</a>); virtual;</code></td>
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<td class="itemcode"><code>procedure <b><a href="CastleScene.TSceneRenderingAttributes.html#SetBlendingDestinationFactor">SetBlendingDestinationFactor</a></b>(const Value: <a href="CastleGLUtils.html#TGLenum">TGLenum</a>); virtual;</code></td>
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<td class="itemcode"><code>procedure <b><a href="CastleScene.TSceneRenderingAttributes.html#SetBlendingSort">SetBlendingSort</a></b>(const Value: <a href="CastleScene.html#TBlendingSort">TBlendingSort</a>); virtual;</code></td>
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<td class="itemcode"><code>procedure <b><a href="CastleScene.TSceneRenderingAttributes.html#SetControlBlending">SetControlBlending</a></b>(const Value: boolean); virtual;</code></td>
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<td class="itemcode"><code>procedure <b><a href="CastleScene.TSceneRenderingAttributes.html#SetUseOcclusionQuery">SetUseOcclusionQuery</a></b>(const Value: boolean); virtual;</code></td>
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<td class="itemcode"><code>procedure <b><a href="CastleScene.TSceneRenderingAttributes.html#SetShaders">SetShaders</a></b>(const Value: <a href="CastleRenderer.html#TShadersRendering">TShadersRendering</a>); override;</code></td>
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<td class="itemcode"><code>constructor <b><a href="CastleScene.TSceneRenderingAttributes.html#Create">Create</a></b>; override;</code></td>
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<td class="itemcode"><code>destructor <b><a href="CastleScene.TSceneRenderingAttributes.html#Destroy">Destroy</a></b>; override;</code></td>
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<td class="itemcode"><code>procedure <b><a href="CastleScene.TSceneRenderingAttributes.html#Assign">Assign</a></b>(Source: TPersistent); override;</code></td>
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<a name="PasDoc-Properties"></a><h3 class="summary">Properties</h3>
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<td class="itemcode"><code>property <b><a href="CastleScene.TSceneRenderingAttributes.html#Blending">Blending</a></b>: boolean
read FBlending write <a href="CastleScene.TSceneRenderingAttributes.html#SetBlending">SetBlending</a> default true;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleScene.TSceneRenderingAttributes.html#BlendingSourceFactor">BlendingSourceFactor</a></b>: <a href="CastleGLUtils.html#TGLenum">TGLenum</a>
read FBlendingSourceFactor write <a href="CastleScene.TSceneRenderingAttributes.html#SetBlendingSourceFactor">SetBlendingSourceFactor</a>
default <a href="CastleScene.TSceneRenderingAttributes.html#DefaultBlendingSourceFactor">DefaultBlendingSourceFactor</a>;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleScene.TSceneRenderingAttributes.html#BlendingDestinationFactor">BlendingDestinationFactor</a></b>: <a href="CastleGLUtils.html#TGLenum">TGLenum</a>
read FBlendingDestinationFactor write <a href="CastleScene.TSceneRenderingAttributes.html#SetBlendingDestinationFactor">SetBlendingDestinationFactor</a>
default <a href="CastleScene.TSceneRenderingAttributes.html#DefaultBlendingDestinationFactor">DefaultBlendingDestinationFactor</a>;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleScene.TSceneRenderingAttributes.html#BlendingSort">BlendingSort</a></b>: <a href="CastleScene.html#TBlendingSort">TBlendingSort</a>
read FBlendingSort write <a href="CastleScene.TSceneRenderingAttributes.html#SetBlendingSort">SetBlendingSort</a>
default <a href="CastleScene.TSceneRenderingAttributes.html#DefaultBlendingSort">DefaultBlendingSort</a>;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleScene.TSceneRenderingAttributes.html#ControlBlending">ControlBlending</a></b>: boolean
read FControlBlending write <a href="CastleScene.TSceneRenderingAttributes.html#SetControlBlending">SetControlBlending</a> default true;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleScene.TSceneRenderingAttributes.html#WireframeEffect">WireframeEffect</a></b>: <a href="CastleScene.html#TWireframeEffect">TWireframeEffect</a>
read FWireframeEffect write FWireframeEffect default weNormal;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleScene.TSceneRenderingAttributes.html#SolidWireframeScale">SolidWireframeScale</a></b>: Single read FSolidWireframeScale write FSolidWireframeScale default <a href="CastleScene.TSceneRenderingAttributes.html#DefaultSolidWireframeScale">DefaultSolidWireframeScale</a>;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleScene.TSceneRenderingAttributes.html#SolidWireframeBias">SolidWireframeBias</a></b>: Single read FSolidWireframeBias write FSolidWireframeBias default <a href="CastleScene.TSceneRenderingAttributes.html#DefaultSolidWireframeBias">DefaultSolidWireframeBias</a>;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleScene.TSceneRenderingAttributes.html#SilhouetteScale">SilhouetteScale</a></b>: Single read FSilhouetteScale write FSilhouetteScale default <a href="CastleScene.TSceneRenderingAttributes.html#DefaultSilhouetteScale">DefaultSilhouetteScale</a>;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleScene.TSceneRenderingAttributes.html#SilhouetteBias">SilhouetteBias</a></b>: Single read FSilhouetteBias write FSilhouetteBias default <a href="CastleScene.TSceneRenderingAttributes.html#DefaultSilhouetteBias">DefaultSilhouetteBias</a>;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleScene.TSceneRenderingAttributes.html#WireframeColor">WireframeColor</a></b>: <a href="CastleVectors.html#TVector3Single">TVector3Single</a>
read FWireframeColor write FWireframeColor;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleScene.TSceneRenderingAttributes.html#UseOcclusionQuery">UseOcclusionQuery</a></b>: boolean
read FUseOcclusionQuery write <a href="CastleScene.TSceneRenderingAttributes.html#SetUseOcclusionQuery">SetUseOcclusionQuery</a> default false;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleScene.TSceneRenderingAttributes.html#UseHierarchicalOcclusionQuery">UseHierarchicalOcclusionQuery</a></b>: boolean
read FUseHierarchicalOcclusionQuery
write FUseHierarchicalOcclusionQuery default false;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleScene.TSceneRenderingAttributes.html#DebugHierOcclusionQueryResults">DebugHierOcclusionQueryResults</a></b>: boolean
read FDebugHierOcclusionQueryResults
write FDebugHierOcclusionQueryResults default false;</code></td>
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<h2 class="description">Description</h2>
<h3 class="detail">Fields</h3>
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<td class="itemcode"><a name="DefaultBlendingSourceFactor"></a><code>internal const <b>DefaultBlendingSourceFactor</b> = GL_SRC_ALPHA;</code></td>
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<td class="itemcode"><a name="DefaultBlendingDestinationFactor"></a><code>internal const <b>DefaultBlendingDestinationFactor</b> = GL_ONE_MINUS_SRC_ALPHA;</code></td>
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<p>
Default value of Attributes.BlendingDestinationFactor. See <a class="normal" href="CastleScene.TSceneRenderingAttributes.html#BlendingDestinationFactor">TSceneRenderingAttributes.BlendingDestinationFactor</a>.
<p>Using ONE_MINUS_SRC_ALPHA is the standard value for 3D graphic stuff, often producing best results. However, it causes troubles when multiple transparent shapes are visible on the same screen pixel. For closed convex 3D objects, using backface culling (solid = TRUE for geometry) helps. For multiple transparent shapes, sorting the transparent shapes helps, see <a class="normal" href="CastleScene.TSceneRenderingAttributes.html#BlendingSort">TSceneRenderingAttributes.BlendingSort</a>. Sometimes, no solution works for all camera angles.
<p>Another disadvantage of ONE_MINUS_SRC_ALPHA may be that the color of opaque shapes disappears too quickly from resulting image (since GL_ONE_MINUS_SRC_ALPHA scales it down). So the image may be darker than you like.
<p>You can instead consider using GL_ONE, that doesn't require sorting and never has problems with multiple transparent shapes. On the other hand, it only adds to the color, often making too bright results.</p>
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<td class="itemcode"><a name="DefaultBlendingSort"></a><code>internal const <b>DefaultBlendingSort</b> = bsNone;</code></td>
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<td class="itemcode"><a name="DefaultWireframeColor"></a><code>internal const <b>DefaultWireframeColor</b>: <a href="CastleVectors.html#TVector3Single">TVector3Single</a> = (0, 0, 0);</code></td>
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<td class="itemcode"><a name="DefaultSolidWireframeScale"></a><code>internal const <b>DefaultSolidWireframeScale</b> = 1;</code></td>
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<td class="itemcode"><a name="DefaultSolidWireframeBias"></a><code>internal const <b>DefaultSolidWireframeBias</b> = 1;</code></td>
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<td class="itemcode"><a name="DefaultSilhouetteScale"></a><code>internal const <b>DefaultSilhouetteScale</b> = 5;</code></td>
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<td class="itemcode"><a name="DefaultSilhouetteBias"></a><code>internal const <b>DefaultSilhouetteBias</b> = 5;</code></td>
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<td class="itemcode"><a name="OnCreate"></a><code>var <b>OnCreate</b>: <a href="CastleScene.html#TRenderingAttributesEvent">TRenderingAttributesEvent</a>; static;</code></td>
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Adjust attributes of all loaded resources.</p>
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<h3 class="detail">Methods</h3>
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<td class="itemcode"><a name="ReleaseCachedResources"></a><code>procedure <b>ReleaseCachedResources</b>; override;</code></td>
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<td class="itemcode"><a name="SetBlending"></a><code>procedure <b>SetBlending</b>(const Value: boolean); virtual;</code></td>
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<td class="itemcode"><a name="SetBlendingSourceFactor"></a><code>procedure <b>SetBlendingSourceFactor</b>(const Value: <a href="CastleGLUtils.html#TGLenum">TGLenum</a>); virtual;</code></td>
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<td class="itemcode"><a name="SetBlendingDestinationFactor"></a><code>procedure <b>SetBlendingDestinationFactor</b>(const Value: <a href="CastleGLUtils.html#TGLenum">TGLenum</a>); virtual;</code></td>
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<td class="itemcode"><a name="SetBlendingSort"></a><code>procedure <b>SetBlendingSort</b>(const Value: <a href="CastleScene.html#TBlendingSort">TBlendingSort</a>); virtual;</code></td>
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<td class="itemcode"><a name="SetControlBlending"></a><code>procedure <b>SetControlBlending</b>(const Value: boolean); virtual;</code></td>
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<td class="itemcode"><a name="SetUseOcclusionQuery"></a><code>procedure <b>SetUseOcclusionQuery</b>(const Value: boolean); virtual;</code></td>
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<td class="itemcode"><a name="SetShaders"></a><code>procedure <b>SetShaders</b>(const Value: <a href="CastleRenderer.html#TShadersRendering">TShadersRendering</a>); override;</code></td>
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<td class="itemcode"><a name="Create"></a><code>constructor <b>Create</b>; override;</code></td>
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<td class="itemcode"><a name="Destroy"></a><code>destructor <b>Destroy</b>; override;</code></td>
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<td class="itemcode"><a name="Assign"></a><code>procedure <b>Assign</b>(Source: TPersistent); override;</code></td>
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<h3 class="detail">Properties</h3>
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<td class="itemcode"><a name="Blending"></a><code>property <b>Blending</b>: boolean
read FBlending write <a href="CastleScene.TSceneRenderingAttributes.html#SetBlending">SetBlending</a> default true;</code></td>
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Render partially transparent objects.
<p>More precisely: if this is <code>True</code>, all shapes with transparent materials or textures with non-trivial (not only yes/no) alpha channel will be rendered using OpenGL blending (with depth test off, like they should for OpenGL).
<p>If this attribute is <code>False</code>, everything will be rendered as opaque.</p>
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<td class="itemcode"><a name="BlendingSourceFactor"></a><code>property <b>BlendingSourceFactor</b>: <a href="CastleGLUtils.html#TGLenum">TGLenum</a>
read FBlendingSourceFactor write <a href="CastleScene.TSceneRenderingAttributes.html#SetBlendingSourceFactor">SetBlendingSourceFactor</a>
default <a href="CastleScene.TSceneRenderingAttributes.html#DefaultBlendingSourceFactor">DefaultBlendingSourceFactor</a>;</code></td>
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Blending function parameters, used when <a class="normal" href="CastleScene.TSceneRenderingAttributes.html#Blending">Blending</a>. See OpenGL documentation of glBlendFunc for possible values here.
<p>See also <a class="normal" href="CastleScene.TSceneRenderingAttributes.html#DefaultBlendingDestinationFactor">DefaultBlendingDestinationFactor</a> for comments about GL_ONE and GL_ONE_MINUS_SRC_ALPHA.
<p>Note that this is only a default, VRML/X3D model can override this for specific shapes by using our extension BlendMode node. See [<a href="http://castle-engine.sourceforge.net/x3d_extensions.php#section_ext_blending">http://castle-engine.sourceforge.net/x3d_extensions.php#section_ext_blending</a>].
<p>Note that <a class="normal" href="CastleScene.TSceneRenderingAttributes.html#BlendingSort">BlendingSort</a> may be overridden is a specific 3D models by using NavigationInfo node with <a class="normal" href="CastleScene.TSceneRenderingAttributes.html#BlendingSort">blendingSort</a> field, see <a class="normal" href="X3DNodes.TNavigationInfoNode.html#BlendingSort">TNavigationInfoNode.BlendingSort</a>.
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<td class="itemcode"><a name="BlendingDestinationFactor"></a><code>property <b>BlendingDestinationFactor</b>: <a href="CastleGLUtils.html#TGLenum">TGLenum</a>
read FBlendingDestinationFactor write <a href="CastleScene.TSceneRenderingAttributes.html#SetBlendingDestinationFactor">SetBlendingDestinationFactor</a>
default <a href="CastleScene.TSceneRenderingAttributes.html#DefaultBlendingDestinationFactor">DefaultBlendingDestinationFactor</a>;</code></td>
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<td class="itemcode"><a name="BlendingSort"></a><code>property <b>BlendingSort</b>: <a href="CastleScene.html#TBlendingSort">TBlendingSort</a>
read FBlendingSort write <a href="CastleScene.TSceneRenderingAttributes.html#SetBlendingSort">SetBlendingSort</a>
default <a href="CastleScene.TSceneRenderingAttributes.html#DefaultBlendingSort">DefaultBlendingSort</a>;</code></td>
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<td class="itemcode"><a name="ControlBlending"></a><code>property <b>ControlBlending</b>: boolean
read FControlBlending write <a href="CastleScene.TSceneRenderingAttributes.html#SetControlBlending">SetControlBlending</a> default true;</code></td>
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Setting this to <code>False</code> disables any modification of OpenGL blending (and depth mask) state by <a class="normal" href="CastleScene.TCastleScene.html">TCastleScene</a>. This makes every other <a class="normal" href="CastleScene.TSceneRenderingAttributes.html#Blending">Blending</a> setting ignored, and is useful only if you set your own OpenGL blending parameters when rendering this scene.</p>
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<td class="itemcode"><a name="WireframeEffect"></a><code>property <b>WireframeEffect</b>: <a href="CastleScene.html#TWireframeEffect">TWireframeEffect</a>
read FWireframeEffect write FWireframeEffect default weNormal;</code></td>
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You can use this to turn on some effects related to rendering model in special modes.
<p>When this is weNormal (default), nothing special is done, which means that model polygons are simply passed to OpenGL. Whether this results in filled or wireframe, depends on OpenGL glPolygonMode setting, filled by default.
<p>How the wireframe effects work when Mode = rmDepth is undefined now. Just don't use Mode = rmDepth if you're unsure.
<p>See description of <a class="normal" href="CastleScene.html#TWireframeEffect">TWireframeEffect</a> for what other modes do.</p>
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<td class="itemcode"><a name="SolidWireframeScale"></a><code>property <b>SolidWireframeScale</b>: Single read FSolidWireframeScale write FSolidWireframeScale default <a href="CastleScene.TSceneRenderingAttributes.html#DefaultSolidWireframeScale">DefaultSolidWireframeScale</a>;</code></td>
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<td class="itemcode"><a name="SolidWireframeBias"></a><code>property <b>SolidWireframeBias</b>: Single read FSolidWireframeBias write FSolidWireframeBias default <a href="CastleScene.TSceneRenderingAttributes.html#DefaultSolidWireframeBias">DefaultSolidWireframeBias</a>;</code></td>
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<td class="itemcode"><a name="SilhouetteScale"></a><code>property <b>SilhouetteScale</b>: Single read FSilhouetteScale write FSilhouetteScale default <a href="CastleScene.TSceneRenderingAttributes.html#DefaultSilhouetteScale">DefaultSilhouetteScale</a>;</code></td>
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<td class="itemcode"><a name="SilhouetteBias"></a><code>property <b>SilhouetteBias</b>: Single read FSilhouetteBias write FSilhouetteBias default <a href="CastleScene.TSceneRenderingAttributes.html#DefaultSilhouetteBias">DefaultSilhouetteBias</a>;</code></td>
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<td class="itemcode"><a name="WireframeColor"></a><code>property <b>WireframeColor</b>: <a href="CastleVectors.html#TVector3Single">TVector3Single</a>
read FWireframeColor write FWireframeColor;</code></td>
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Wireframe color, used with some <a class="normal" href="CastleScene.TSceneRenderingAttributes.html#WireframeEffect">WireframeEffect</a> values. Default value is <a class="normal" href="CastleScene.TSceneRenderingAttributes.html#DefaultWireframeColor">DefaultWireframeColor</a>.</p>
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<td class="itemcode"><a name="UseOcclusionQuery"></a><code>property <b>UseOcclusionQuery</b>: boolean
read FUseOcclusionQuery write <a href="CastleScene.TSceneRenderingAttributes.html#SetUseOcclusionQuery">SetUseOcclusionQuery</a> default false;</code></td>
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Should we use ARB_occlusion_query (if available) to avoid rendering shapes that didn't pass occlusion test in previous frame. Ignored if GPU doesn't support ARB_occlusion_query.
<p><code>True</code> may give you a large speedup in some scenes. OTOH, a lag of one frame may happen between an object should be rendered and it actually appears.
<p>When you render more than once the same instance of <a class="normal" href="CastleScene.TCastleScene.html">TCastleScene</a> scene, you should not activate it (as the occlusion query doesn't make sense if each following render of the scene takes place at totally different translation). Also, when rendering something more than just one <a class="normal" href="CastleScene.TCastleScene.html">TCastleScene</a> scene (maybe many times the same <a class="normal" href="CastleScene.TCastleScene.html">TCastleScene</a> instance, maybe many different <a class="normal" href="CastleScene.TCastleScene.html">TCastleScene</a> instances, maybe some other 3D objects) you should try to sort rendering order from the most to the least possible occluder (otherwise occlusion query will not be as efficient at culling).
<p>This is ignored if <a class="normal" href="CastleScene.TSceneRenderingAttributes.html#UseHierarchicalOcclusionQuery">UseHierarchicalOcclusionQuery</a>.</p>
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<td class="itemcode"><a name="UseHierarchicalOcclusionQuery"></a><code>property <b>UseHierarchicalOcclusionQuery</b>: boolean
read FUseHierarchicalOcclusionQuery
write FUseHierarchicalOcclusionQuery default false;</code></td>
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Should we use ARB_occlusion_query (if available) with a hierarchical algorithm to avoid rendering shapes that didn't pass occlusion test in previous frame. Ignored if GPU doesn't support ARB_occlusion_query.
<p><code>True</code> may give you a large speedup in some scenes.
<p>This method doesn't impose any lag of one frame (like <a class="normal" href="CastleScene.TSceneRenderingAttributes.html#UseOcclusionQuery">UseOcclusionQuery</a>).
<p>This requires the usage of <a class="normal" href="CastleSceneCore.TCastleSceneCore.html#OctreeRendering">TCastleSceneCore.OctreeRendering</a>. Also, it always does frustum culling (like fcBox for now), regardless of <a class="normal" href="CastleScene.TCastleScene.html#OctreeFrustumCulling">TCastleScene.OctreeFrustumCulling</a> setting.
<p>The algorithm used underneath is "Coherent Hierarchical Culling", described in detail in "GPU Gems 2", Chapter 6: "Hardware Occlusion Queries Made Useful", by Michael Wimmer and Jiri Bittner. Online on [<a href="http://http.developer.nvidia.com/GPUGems2/gpugems2_chapter06.html">http://http.developer.nvidia.com/GPUGems2/gpugems2_chapter06.html</a>].</p>
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<td class="itemcode"><a name="DebugHierOcclusionQueryResults"></a><code>property <b>DebugHierOcclusionQueryResults</b>: boolean
read FDebugHierOcclusionQueryResults
write FDebugHierOcclusionQueryResults default false;</code></td>
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View only the shapes that were detected as visible by occlusion query in last Render.
<p>Use this only after render with <a class="normal" href="CastleScene.TSceneRenderingAttributes.html#UseHierarchicalOcclusionQuery">UseHierarchicalOcclusionQuery</a>. TODO: for <a class="normal" href="CastleScene.TSceneRenderingAttributes.html#UseOcclusionQuery">UseOcclusionQuery</a> I would also like to make it work, for now not done as frustum information is gone. This will disable actual occlusion query, instead reusing results from last occlusion query done when this debug flag was <code>False</code>.
<p>Useful to quickly visualize the benefits of occlusion query.</p>
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