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<article class="doc">
<h1 class="page">Polygon Meshes</h1>
<div id="preamble">
<div class="sectionbody">
<div class="imageblock text-right">
<div class="content">
<img src="../_images/scene/dolphin-mesh.png" alt="dolphin-mesh.png" width="" height="">
</div>
</div>
<div class="paragraph">
<p>All visible game elements in a scene, whether it is a Model or a Shape, are made up of polygon meshes. JME3 has a <a href="https://javadoc.jmonkeyengine.org/v3.4.1-stable/com/jme3/scene/Mesh.html">com.jme3.scene.Mesh</a> class that represents all meshes.</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Meshes are made up of triangles: <code>getTriangleCount(…)</code> and <code>getTriangle(…)</code></p>
</li>
<li>
<p>Each mesh has a unique ID: <code>getId()</code></p>
</li>
<li>
<p>Meshes have transformations: Location (local translation), rotation, scale.</p>
</li>
<li>
<p>Meshes have a bounding volume. jME3 can detect intersections (that is, non-physical collisions) between meshes, or between meshes and 2D elements such as rays: <code>collideWith()</code>.</p>
</li>
<li>
<p>Meshes are locked with <code>setStatic()</code> and unlocked with <code>setDynamic()</code>.</p>
<div class="ulist">
<ul>
<li>
<p>Static Meshes cannot be modified, but are more optimized and faster (they can be precalculated).</p>
</li>
<li>
<p>Dynamic Meshes can be modified live, but are not optimized and slower.</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
<div class="paragraph">
<p>You have several options when <a href="spatial.html" class="xref page">creating Geometries from meshes</a>:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Use built-in <a href="shape/shape.html" class="xref page">Shape</a>s as meshes;</p>
</li>
<li>
<p>Load <a href="3d_models.html" class="xref page">3D models</a> (that is, meshes created in external applications); or</p>
</li>
<li>
<p>Create free-form <a href="custom_meshes.html" class="xref page">custom meshes</a> programmatically.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="vertex-buffer"><a class="anchor" href="#vertex-buffer"></a>Vertex Buffer</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The VertexBuffer contains a particular type of geometry data used by Meshes. Every VertexBuffer set on a Mesh is sent as an attribute to the vertex shader to be processed.</p>
</div>
<div class="sect2">
<h3 id="mesh-vertex-buffers"><a class="anchor" href="#mesh-vertex-buffers"></a>Mesh Vertex Buffers</h3>
<div class="paragraph">
<p>Here is the list of <a href="https://javadoc.jmonkeyengine.org/v3.4.1-stable/com/jme3/scene/VertexBuffer.Type.html">VertexBuffer</a> types.</p>
</div>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Vertex Buffer Type</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Type.Position</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Position of the vertex (3 floats)</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Type.Index</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Specifies the index buffer, must contain integer data.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Type.TexCoord</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Texture coordinate</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Type.TexCoord2</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Texture coordinate #2</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Type.Normal</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Normal vector, normalized.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Type.Tangent</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Tangent vector, normalized.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Type.Binormal</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Binormal vector, normalized.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Type.Color</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Color and Alpha (4 floats)</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Type.Size</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>The size of the point when using point buffers.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Type.InterleavedData</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Specifies the source data for various vertex buffers when interleaving is used.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Type.BindPosePosition</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Initial vertex position, used with animation.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Type.BindPoseNormal</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Initial vertex normals, used with animation</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Type.BoneWeight</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Bone weights, used with animation</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Type.BoneIndex</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Bone indices, used with animation</p>
</div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="sect2">
<h3 id="mesh-properties"><a class="anchor" href="#mesh-properties"></a>Mesh Properties</h3>
<div class="paragraph">
<p>Some Mesh properties from the <a href="https://javadoc.jmonkeyengine.org/v3.4.1-stable/com/jme3/scene/Mesh.html">Mesh</a> class.</p>
</div>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Mesh method</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>setBound(boundingVolume)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>if you need to specify a custom optimized bounding volume</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>setStatic()</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Locks the mesh so you cannot modify it anymore, thus optimizing its data (faster).</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>setDynamic()</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Unlocks the mesh so you can modified it, but this will un-optimize the data (slower).</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>setMode(Mesh.Mode.Points)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Used to set mesh rendering modes, see below.</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>getId()</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>returns the Mesh ID, default value is -1</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>getTriangle(int,tri)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>returns data of triangle number <code>int</code> into variable <code>tri</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>scaleTextureCoordinates(Vector2f)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>How the texture will be stretched over the whole mesh.</p>
</div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="sect2">
<h3 id="mesh-rendering-modes"><a class="anchor" href="#mesh-rendering-modes"></a>Mesh Rendering Modes</h3>
<div class="paragraph">
<p>Here is the list of <a href="https://javadoc.jmonkeyengine.org/v3.4.1-stable/com/jme3/scene/Mesh.Mode.html">Mesh rendering modes</a>.</p>
</div>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Mesh Mode</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Mesh.Mode.Points</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Show only corner points (vertices) of mesh</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Mesh.Mode.Lines</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Show lines (edges) of mesh</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Mesh.Mode.LineLoop</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>?</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Mesh.Mode.LineStrip</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>?</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Mesh.Mode.Triangles</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>?</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Mesh.Mode.TriangleStrip</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>?</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Mesh.Mode.TriangleFan</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>?</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Mesh.Mode.Hybrid</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>?</p>
</div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="sect2">
<h3 id="level-of-detail"><a class="anchor" href="#level-of-detail"></a>Level of Detail</h3>
<div class="paragraph">
<p>Optionally, custom meshes can have a LOD (level of detail optimization) that renders more or less detail, depending on the distance of the mesh from the camera. You have to specify several vertex buffers, one for each level of detail you want (very far away with few details, close up with all details, and something in the middle). Use <code>setLodLevels(VertexBuffer[] lodLevels)</code>.</p>
</div>
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