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<title>Castle Game Engine: CastleSceneCore: record TManifoldEdge</title>
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<a name="TManifoldEdge"></a><h1 class="cio">record TManifoldEdge</h1>
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<td><a class="section" href="#PasDoc-Description">Description</a></td><td>Hierarchy</td><td><a class="section" href="#PasDoc-Fields">Fields</a></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="CastleSceneCore.html">CastleSceneCore</a></p>
<h2 class="declaration">Declaration</h2>
<p class="declaration">
<code>type TManifoldEdge = record</code></p>
<h2 class="description">Description</h2>
<p>
Scene edge that is between exactly two triangles. It's used by <a class="normal" href="CastleSceneCore.TCastleSceneCore.html#ManifoldEdges">TCastleSceneCore.ManifoldEdges</a>, and this is crucial for rendering silhouette shadow volumes in OpenGL.</p>
<h2 class="overview">Overview</h2>
<a name="PasDoc-Fields"></a><h3 class="summary">Fields</h3>
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<td class="itemcode"><code><b><a href="CastleSceneCore.TManifoldEdge.html#VertexIndex">VertexIndex</a></b>: Cardinal;</code></td>
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<tr class="list2">
<td class="itemcode"><code><b><a href="CastleSceneCore.TManifoldEdge.html#Triangles">Triangles</a></b>: array [0..1] of Cardinal;</code></td>
</tr>
<tr class="list">
<td class="itemcode"><code><b><a href="CastleSceneCore.TManifoldEdge.html#V0">V0</a></b>: <a href="CastleVectors.html#TVector3Single">TVector3Single</a>;</code></td>
</tr>
<tr class="list2">
<td class="itemcode"><code><b><a href="CastleSceneCore.TManifoldEdge.html#V1">V1</a></b>: <a href="CastleVectors.html#TVector3Single">TVector3Single</a>;</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="VertexIndex"></a><code><b>VertexIndex</b>: Cardinal;</code></td>
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<p>
Index to get vertexes of this edge. The actual edge's vertexes are not recorded here (this would prevent using <a class="normal" href="CastleSceneCore.TCastleSceneCore.html#ShareManifoldAndBorderEdges">TCastleSceneCore.ShareManifoldAndBorderEdges</a> with various scenes from the same animation). You should get them as the <code>VertexIndex</code> and (<code>VertexIndex</code>+1) mod 3 vertexes of the first triangle (i.e. Triangles[0]).</p>
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<td class="itemcode"><a name="Triangles"></a><code><b>Triangles</b>: array [0..1] of Cardinal;</code></td>
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<p>
Indexes to <a class="normal" href="CastleSceneCore.TCastleSceneCore.html#TrianglesListShadowCasters">TCastleSceneCore.TrianglesListShadowCasters</a> array</p>
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<td class="itemcode"><a name="V0"></a><code><b>V0</b>: <a href="CastleVectors.html#TVector3Single">TVector3Single</a>;</code></td>
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<tr><td colspan="1">
<p>
These are vertexes at <a class="normal" href="CastleSceneCore.TManifoldEdge.html#VertexIndex">VertexIndex</a> and (<a class="normal" href="CastleSceneCore.TManifoldEdge.html#VertexIndex">VertexIndex</a>+1)mod 3 positions, but <i>only at generation of manifold edges time</i>. Like said in <a class="normal" href="CastleSceneCore.TManifoldEdge.html#VertexIndex">VertexIndex</a>, keeping here actual vertex info would prevent <a class="normal" href="CastleSceneCore.TCastleSceneCore.html#ShareManifoldAndBorderEdges">TCastleSceneCore.ShareManifoldAndBorderEdges</a>. However, using these when generating makes a great speed-up when generating manifold edges.
<p>Memory cost is acceptable: assume we have model with 10 000 faces, so 15 000 edges (assuming it's correctly closed manifold), so we waste 15 000 * 2 * SizeOf(<a class="normal" href="CastleVectors.html#TVector3Single">TVector3Single</a>) = 360 000 bytes... that's really nothing to worry (we waste much more on other things).
<p>Checked with "The Castle": indeed, this costs about 1 MB memory (out of 218 MB...), with really lot of creatures... On the other hand, this causes small speed-up when loading: loading creatures is about 5 seconds faster (18 with, 23 without this).
<p>So memory loss is small, speed gain is noticeable (but still small), implementation code is a little simplified, so I'm keeping this. Also, in the future, maybe it will be sensible to use this for actual shadow quad rendering, in cases when we know that <a class="normal" href="CastleSceneCore.TCastleSceneCore.html#ShareManifoldAndBorderEdges">TCastleSceneCore.ShareManifoldAndBorderEdges</a> was not used to make it.</p>
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<table class="detail wide_list">
<tr class="list">
<td class="itemcode"><a name="V1"></a><code><b>V1</b>: <a href="CastleVectors.html#TVector3Single">TVector3Single</a>;</code></td>
</tr>
<tr><td colspan="1">
<p>
These are vertexes at <a class="normal" href="CastleSceneCore.TManifoldEdge.html#VertexIndex">VertexIndex</a> and (<a class="normal" href="CastleSceneCore.TManifoldEdge.html#VertexIndex">VertexIndex</a>+1)mod 3 positions, but <i>only at generation of manifold edges time</i>. Like said in <a class="normal" href="CastleSceneCore.TManifoldEdge.html#VertexIndex">VertexIndex</a>, keeping here actual vertex info would prevent <a class="normal" href="CastleSceneCore.TCastleSceneCore.html#ShareManifoldAndBorderEdges">TCastleSceneCore.ShareManifoldAndBorderEdges</a>. However, using these when generating makes a great speed-up when generating manifold edges.
<p>Memory cost is acceptable: assume we have model with 10 000 faces, so 15 000 edges (assuming it's correctly closed manifold), so we waste 15 000 * 2 * SizeOf(<a class="normal" href="CastleVectors.html#TVector3Single">TVector3Single</a>) = 360 000 bytes... that's really nothing to worry (we waste much more on other things).
<p>Checked with "The Castle": indeed, this costs about 1 MB memory (out of 218 MB...), with really lot of creatures... On the other hand, this causes small speed-up when loading: loading creatures is about 5 seconds faster (18 with, 23 without this).
<p>So memory loss is small, speed gain is noticeable (but still small), implementation code is a little simplified, so I'm keeping this. Also, in the future, maybe it will be sensible to use this for actual shadow quad rendering, in cases when we know that <a class="normal" href="CastleSceneCore.TCastleSceneCore.html#ShareManifoldAndBorderEdges">TCastleSceneCore.ShareManifoldAndBorderEdges</a> was not used to make it.</p>
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