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    <li><a href="material_definitions.html">.j3md Material Definitions</a></li>
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<article class="doc">
<h1 class="page">How to Use Material Definitions (.j3md)</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>All Geometries need a Material to be visible. Every Material is based on a Material Definition. Material definitions provide the &#8220;logic&#8221; for the material, and a shader draws the material according to the parameters specified in the definition. The J3MD file abstracts the shader and its configuration away from the user, allowing a simple interface where the user can simply set a few parameters on the material to change its appearance and the way its handled by the shaders.</p>
</div>
<div class="paragraph">
<p>The most common Material Definitions are included in the engine, advanced users can create custom ones. In this case you will also be interested in the <a href="material_specification.html" class="xref page">in-depth developer specification of the jME3 material system</a>.</p>
</div>
<div class="paragraph">
<p><strong>Example:</strong></p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">Spatial myGeometry = assetManager.loadModel("Models/Teapot/Teapot.j3o");
Material mat = new Material(assetManager,  // Create new material and...
    "Common/MatDefs/Misc/Unshaded.j3md");  // ... specify a Material Definition file, here "Unshaded.j3md"!
mat.setColor("Color", ColorRGBA.Blue);     // Set one or more material parameters.
myGeometry.setMaterial(mat);               // Use material on this Geometry.</code></pre>
</div>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
<div class="paragraph">
<p>If you use one custom material with certain settings very often, learn about storing material settings in <a href="j3m_material_files.html" class="xref page">j3m Material Files</a>. You either <a href="../../sdk/material_editing.html" class="xref page">use the jMonkeyEngine SDK to create .j3m files</a> (user-friendly), or you <a href="j3m_material_files.html" class="xref page">write .j3m files in a text editor</a> (IDE-independent).</p>
</div>
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="preparing-a-material"><a class="anchor" href="#preparing-a-material"></a>Preparing a Material</h2>
<div class="sectionbody">
<div class="paragraph">
<p>In the <a href="materials_overview.html" class="xref page">Materials Overview</a> list:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Choose a Material Definition that has the features that you need.</p>
<div class="ulist">
<ul>
<li>
<p>Tip: If you don&#8217;t know, start with <code>Unshaded.j3md</code> or <code>Lighting.j3md</code>.</p>
</li>
</ul>
</div>
</li>
<li>
<p>Look at the applicable parameters of the Material Definition and determine which parameters you need to achieve the desired effect (e.g. &#8220;glow&#8221; or &#8220;color&#8221;). Most parameters are optional!</p>
</li>
<li>
<p>Create and save the necessary Texture files to your <code>assets/Textures</code> directory.</p>
<div class="ulist">
<ul>
<li>
<p>E.g. mytex_diffuse.png as ColorMap / DiffuseMap, mytex_normal.png as NormalMap, mytex_alpha.png as AlphaMap, etc…</p>
</li>
</ul>
</div>
</li>
<li>
<p>Determine the required values to achieve the effect that you want.</p>
<div class="ulist">
<ul>
<li>
<p>E.g. set colors, floats, booleans, etc…</p>
</li>
</ul>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="using-a-material"><a class="anchor" href="#using-a-material"></a>Using a Material</h2>
<div class="sectionbody">
<div class="paragraph">
<p>In your Java code,</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Create a Material object based on the chosen Material Definition (.j3md file):</p>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");</code></pre>
</div>
</div>
</li>
<li>
<p>Configure your Material by setting the appropriate values listed in the <a href="materials_overview.html" class="xref page">Materials Overview</a> table.</p>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">mat.setColor("Color", ColorRGBA.Yellow ); // and more</code></pre>
</div>
</div>
</li>
<li>
<p>Apply your prepared Material to a Geometry:</p>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">myGeometry.setMaterial(mat);</code></pre>
</div>
</div>
</li>
<li>
<p>(Optional) Adjust the texture scale of the mesh:</p>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">myGeometryMesh.scaleTextureCoordinates(new Vector2f(2f, 2f));</code></pre>
</div>
</div>
</li>
</ol>
</div>
<div class="paragraph">
<p>For details see also: <a href="how_to_use_materials.html" class="xref page">How to Use Materials</a></p>
</div>
<div class="sect2">
<h3 id="examples"><a class="anchor" href="#examples"></a>Examples</h3>
<div class="paragraph">
<p>Here are examples of the methods that set the different data types:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>mat.setColor(   "Color",       ColorRGBA.White );</code></p>
</li>
<li>
<p><code>mat.setTexture( "ColorMap",    assetManager.loadTexture("Interface/Logo/Monkey.png" ));</code></p>
</li>
<li>
<p><code>mat.setFloat(   "Shininess",   5f);</code></p>
</li>
<li>
<p><code>mat.setBoolean( "SphereMap",   true);</code></p>
</li>
<li>
<p><code>mat.setVector3( "NormalScale", new Vector3f(1f,1f,1f));</code></p>
</li>
</ul>
</div>
<div class="paragraph">
<p>A simple textured material.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">Material mat = new Material(assetManager,
    "Common/MatDefs/Misc/Unshaded.j3md");
mat.setTexture("ColorMap", assetManager.loadTexture(
    "Interface/Logo/Monkey.jpg"));</code></pre>
</div>
</div>
<div class="paragraph">
<p>A textured material with a color bleeding through transparent areas.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">Material mat = new Material(assetManager,
    "Common/MatDefs/Misc/Unshaded.j3md");
mat.setTexture("ColorMap", assetManager.loadTexture(
    "Textures/ColoredTex/Monkey.png"));
mat.setColor("Color", ColorRGBA.Blue);</code></pre>
</div>
</div>
<div class="paragraph">
<p>You can test these examples within the following code snippet. It creates a box and applies the material:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java"> Box b = new Box(Vector3f.ZERO, 1, 1, 1);
Geometry geom = new Geometry("Box", b);
// ... insert Material definition...
geom.setMaterial(mat);
rootNode.attachChild(geom);</code></pre>
</div>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
<div class="paragraph">
<p>You can find these and other common code snippets in the jMonkeyEngine SDK Code Palette. Drag and drop them into your source code.</p>
</div>
</td>
</tr>
</table>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="creating-a-custom-material-definition"><a class="anchor" href="#creating-a-custom-material-definition"></a>Creating a Custom Material Definition</h2>
<div class="sectionbody">
<div class="paragraph">
<p>First read the <a href="material_specification.html" class="xref page">developer specification of the jME3 material system (.j3md,.j3m)</a>. Also check out the <a href="../../getting-started/build_from_sources.html" class="xref page">engine source code</a> and have a look at how some Material Definitions are implemented.</p>
</div>
<div class="paragraph">
<p>You can create your own Material Definitions and place them in your project&#8217;s <code>assets/MatDefs</code> directory.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Find the existing MatDefs in <code>engine/src/core-data/Common/MatDefs/</code>.</p>
</li>
<li>
<p>Open a Something.j3md file in a text editor. You see that this .j3md file defines Material Parameters and Techniques.</p>
<div class="ulist">
<ul>
<li>
<p>Material Parameters are the ones that you set in Materials, as shown in the examples above.</p>
</li>
<li>
<p>The Techniques rely on VertexShaders and FragmentShaders: You find those in the files Something.vert and Something.frag in the same directory.</p>
</li>
</ul>
</div>
</li>
<li>
<p>Learn about GLSL (OpenGL Shading Language) to understand the .vert and .frag syntax, then write your own.</p>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="related-links"><a class="anchor" href="#related-links"></a>Related Links</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><a href="material_specification.html" class="xref page">Developer specification of the jME3 material system (.j3md,.j3m)</a></p>
</li>
</ul>
</div>
</div>
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