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<h1 class="page">Integrating Nifty GUI: Projection</h1>
<div id="preamble">
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p><a href="nifty_gui.html" class="xref page">Nifty GUI Concepts</a></p>
</li>
<li>
<p><a href="nifty_gui_best_practices.html" class="xref page">Nifty GUI Best Practices</a></p>
</li>
<li>
<p><a href="nifty_gui_xml_layout.html" class="xref page">Nifty GUI XML Layout</a> or <a href="nifty_gui_java_layout.html" class="xref page">Nifty GUI Java Layout</a></p>
</li>
<li>
<p><a href="nifty_gui_overlay.html" class="xref page">Nifty GUI Overlay</a> or <strong>Nifty <abbr title="Graphical User Interface">GUI</abbr> Projection</strong></p>
</li>
<li>
<p><a href="nifty_gui_java_interaction.html" class="xref page">Interact with the GUI from Java</a></p>
</li>
</ol>
</div>
<div class="imageblock text-left">
<div class="content">
<img src="../_images/gui/nifty-gui.png" alt="nifty-gui.png" width="310" height="250">
</div>
</div>
<div class="paragraph">
<p>Typically you define a key (for example escape) to switch the <abbr title="Graphical User Interface">GUI</abbr> on and off. Then you <a href="nifty_gui_overlay.html" class="xref page">overlay</a> the running game with the <abbr title="Graphical User Interface">GUI</abbr> (you will most likely pause the game then).</p>
</div>
<div class="paragraph">
<p>Alternatively, you can also project the <abbr title="Graphical User Interface">GUI</abbr> as a texture onto a mesh textures inside the game. Although this looks cool and &#8220;immersive&#8221;, this approach is rarely used since it is difficult to record clicks this way. You can only interact with this projected <abbr title="Graphical User Interface">GUI</abbr> by keyboard, or programmatically. You can select input fields using the arrow keys, and trigger actions using the return key.</p>
</div>
<div class="paragraph">
<p>This <abbr title="Graphical User Interface">GUI</abbr> projection variant is less commonly used than the <abbr title="Graphical User Interface">GUI</abbr> overlay variant. Usecases for <abbr title="Graphical User Interface">GUI</abbr> projection are, for example, a player avatar using an in-game computer screen.</p>
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<div class="sect1">
<h2 id="sample-code"><a class="anchor" href="#sample-code"></a>Sample Code</h2>
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<div class="ulist">
<ul>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-examples/src/main/java/jme3test/niftygui/TestNiftyToMesh.java">TestNiftyToMesh.java</a></p>
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<div class="sect1">
<h2 id="projecting-the-user-interface-onto-a-texture"><a class="anchor" href="#projecting-the-user-interface-onto-a-texture"></a>Projecting the User Interface Onto a Texture</h2>
<div class="sectionbody">
<div class="paragraph">
<p>You can project the Nifty <abbr title="Graphical User Interface">GUI</abbr> onto a texture, load the texture into a material, and assign it to a Geometry (Quads or Boxes are best).</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">/** Create a special viewport for the Nifty GUI */
ViewPort niftyView = renderManager.createPreView("NiftyView", new Camera(1024, 768));
niftyView.setClearEnabled(true);
/** Create a new NiftyJmeDisplay for the integration */
NiftyJmeDisplay niftyDisplay = NiftyJmeDisplay.newNiftyJmeDisplay(
  assetManager,  inputManager,  audioRenderer,  niftyView);
/** Create a new NiftyGUI object */
Nifty nifty = niftyDisplay.getNifty();
/** Read your XML and initialize your custom ScreenController */
nifty.fromXml("Interface/helloworld.xml", "start", new MySettingsScreen(data));

/** Prepare a framebuffer for the texture niftytex */
niftyView.addProcessor(niftyDisplay);
FrameBuffer fb = new FrameBuffer(1024, 768, 0);
fb.setDepthBuffer(Format.Depth);
Texture2D niftytex = new Texture2D(1024, 768, Format.RGB8);
fb.setColorTexture(niftytex);
niftyView.setClearEnabled(true);
niftyView.setOutputFrameBuffer(fb);

/** This is the 3D cube we project the GUI on */
Box b = new Box(Vector3f.ZERO, 1, 1, 1);
Geometry geom = new Geometry("Box", b);
Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
mat.setTexture("m_ColorMap", niftytex); /** Here comes the texture! */
geom.setMaterial(mat);
rootNode.attachChild(geom);</code></pre>
</div>
</div>
<div class="paragraph">
<p>The MySettingsScreen class is a custom de.lessvoid.nifty.screen.ScreenController in which you implement your <abbr title="Graphical User Interface">GUI</abbr> behaviour.  The variable <code>data</code> contains an object that you use to exchange state info with the game. See <a href="nifty_gui_java_interaction.html" class="xref page">Nifty GUI Java Interaction</a> for details on how to create this class.</p>
</div>
<div class="paragraph">
<p>Run the code sample. You select buttons on this <abbr title="Graphical User Interface">GUI</abbr> with the arrow keys and then press return. Note that clicking on the texture will not work!</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="next-steps"><a class="anchor" href="#next-steps"></a>Next Steps</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Now that you have layed out and integrated the <abbr title="Graphical User Interface">GUI</abbr> in your app, you want to respond to user input and display the current game.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="nifty_gui_java_interaction.html" class="xref page">Interact with the GUI from Java</a></p>
</li>
</ul>
</div>
</div>
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