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- <body class="article toc2 toc-left">
- <div id="header">
- <h1>Multi-Media Asset Pipeline</h1>
- <div id="toc" class="toc2">
- <div id="toctitle">Table of Contents</div>
- <ul class="sectlevel1">
- <li><a href="#use-the-assets-folder">Use The Assets Folder</a></li>
- <li><a href="#create-textures-and-materials">Create Textures and Materials</a></li>
- <li><a href="#create-3d-models">Create 3D Models</a></li>
- <li><a href="#convert-3d-models-to-j3o-format">Convert 3D Models to .j3o Format</a>
- <ul class="sectlevel2">
- <li><a href="#must-i-convert-to-j3o-yes">Must I convert to .j3o? Yes!</a></li>
- </ul>
- </li>
- <li><a href="#see-also">See Also</a></li>
- </ul>
- </div>
- </div>
- <div id="content">
- <div id="preamble">
- <div class="sectionbody">
- <div class="paragraph">
- <p>Assets are files that are not code. Your multi-media assets includes, for example, your textures (image files), models (mesh files), and sounds (audio files).</p>
- </div>
- <div class="ulist">
- <ul>
- <li>
- <p>You create textures in a graphic editor, for example <a href="http://gimp.org">Gimp</a>, and export them as PNG or JPG.</p>
- </li>
- <li>
- <p>You <a href="jme3/external/blender.html">create models</a> in a 3D mesh editor, for example <a href="http://blender.org">Blender</a>, and export them in Ogre Mesh XML or Wavefront OBJ format.</p>
- </li>
- <li>
- <p>You create sounds in an audio editor, for example <a href="http://audacity.sourceforge.net">Audacity</a>, and export them as WAVE or OGG.</p>
- </li>
- </ul>
- </div>
- <table class="tableblock frame-all grid-all spread">
- <colgroup>
- <col style="width: 100%;">
- </colgroup>
- <tbody>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>DO</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>DON’T</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>Import original models plus textures into <code>assets/Textures</code>.</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>Don’t leave textures or models in a folder outside your JME project: The game cannot load or reference them from there.</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>Save sounds into <code>assets/Sounds</code>.</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>Don’t leave audio files in a folder outside your JME project: The game cannot load or reference them from there.</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>Create low-polygon models.</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>Don’t create high-polygon models, they render too slow to be useful in games.</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>Only use Diffuse Map, Normal Map, Glow Map, Specular Map in your models' materials.</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>Don’t use unsupported material properties that are not listed in the <a href="jme3/advanced/materials_overview.html">Materials Overview</a>.</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>Use UV texture / texture atlases / baking for each texture map.</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>Don’t create models based on multiple separate textures, it will break the model into separate meshes.</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>Convert original models to JME3’s .j3o format. Move .j3o files into <code>assets/Models</code>.</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>Don’t reference original Blender/Ogre/OBJ files in your load() code, because these unoptimized files are not automatically packaged into the final JAR.</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>Agree on naming schemes and folder schemes with your artists early on to avoid confusion. E.g. keep naming schemes for bones and certain model parts. Try to keep your assets folder clean, its like your codes class structure.</p>
- </div></div></td>
- </tr>
- <tr>
- <td class="tableblock halign-left valign-top"><div><div class="paragraph">
- <p>Don’t mindlessly import downloaded models and other assets into your project without keeping a structure and knowing the files work. You can reimport, delete junk.</p>
- </div></div></td>
- </tr>
- </tbody>
- </table>
- <div class="paragraph">
- <p>Read on for details.</p>
- </div>
- </div>
- </div>
- <div class="sect1">
- <h2 id="use-the-assets-folder">Use The Assets Folder</h2>
- <div class="sectionbody">
- <div class="paragraph">
- <p>Store your assets in subfolders of your project’s <code>assets</code> directory. The <code>assets</code> directory is the default path where a JME game’s <a href="jme3/advanced/asset_manager.html">Asset Manager</a> looks for files to load.</p>
- </div>
- <div class="listingblock">
- <div class="content">
- <pre class="CodeRay highlight"><code>jMonkeyProjects/MyGame/assets/Interface/ # .font, .jpg, .png, .xml
- jMonkeyProjects/MyGame/assets/MatDefs/ # .j3md
- jMonkeyProjects/MyGame/assets/Materials/ # .j3m
- jMonkeyProjects/MyGame/assets/Models/ # .blend, .j3o
- jMonkeyProjects/MyGame/assets/Scenes/ # .j3o
- jMonkeyProjects/MyGame/assets/Shaders/ # .j3f, .vert, .frag
- jMonkeyProjects/MyGame/assets/Sounds/ # .ogg, .wav
- jMonkeyProjects/MyGame/assets/Textures/ # .jpg, .png; also .mesh.xml+.material, .mtl+.obj,</code></pre>
- </div>
- </div>
- <div class="paragraph">
- <p>Prepare the <code>asset</code> folder structure for your individual project:</p>
- </div>
- <div class="olist arabic">
- <ol class="arabic">
- <li>
- <p>Agree on a directory structure with the graphic designers.</p>
- </li>
- <li>
- <p>Create subfolders of <code>assets</code> in any way that suits your project (see example above). Stick with one system.</p>
- <div class="ulist">
- <ul>
- <li>
- <p>If different assets belong together, create a parallel subdirectory structure for them.<br>
- Example: For car models, create <code>Textures/vehicles/car1/</code>, <code>Materials/vehicles/car1/</code>, <code>Models/vehicles/car1/</code>, , <code>Sounds/vehicles/car1/</code> (etc) directories now.</p>
- </li>
- </ul>
- </div>
- </li>
- <li>
- <p>Agree on a file naming and numbering scheme with the graphic designers.</p>
- <div class="ulist">
- <ul>
- <li>
- <p>Are some assets used interchangeably? Systematic naming and numbering lets developers easily swap out assets by swapping out parts of the path String.</p>
- </li>
- <li>
- <p>Decide on naming standards for naming interactive parts (arms/legs) of animated models.</p>
- </li>
- </ul>
- </div>
- </li>
- </ol>
- </div>
- <div class="paragraph">
- <p><a href="http://www.youtube.com/watch?v=HFR4socSv_E">Video: Horrible things happen if you mess up labeling your assets. Seriously. ;-)</a></p>
- </div>
- <div class="paragraph">
- <p>See also:</p>
- </div>
- <div class="ulist">
- <ul>
- <li>
- <p>More details on <a href="jme3/advanced/asset_manager.html">Asset Manager</a>, including tips how to work with assets when using other IDEs.</p>
- </li>
- <li>
- <p>Use <a href="sdk/asset_packs.html">Asset Packs</a> to bundle, share, and manage assets!</p>
- </li>
- </ul>
- </div>
- </div>
- </div>
- <div class="sect1">
- <h2 id="create-textures-and-materials">Create Textures and Materials</h2>
- <div class="sectionbody">
- <div class="paragraph">
- <p>Install a graphic editor such as Gimp or Photoshop. <strong>Consult the graphic editor’s documentation for specific details how to do the following tasks.</strong></p>
- </div>
- <div class="olist arabic">
- <ol class="arabic">
- <li>
- <p>Create textures in a graphic editor.</p>
- <div class="ulist">
- <ul>
- <li>
- <p>Save all textures to your prepared subfolders in the <code>assets/Textures</code> directory.</p>
- </li>
- </ul>
- </div>
- </li>
- <li>
- <p>(Optional) If you plan to use JME materials that you set programmatically from the code, create .j3m materials in the SDK.</p>
- <div class="ulist">
- <ul>
- <li>
- <p>Save these .j3m files into the <code>assets/Materials</code> directory.</p>
- </li>
- </ul>
- </div>
- </li>
- </ol>
- </div>
- <div class="paragraph">
- <p>Storing the textures inside your project directory is necessary for the paths in JME’s binary model files (.j3o) to work. Treat the paths of your assets like class names of java classes, they define a specific asset. When you later generate .j3o files, and compile class files, and distribute the application, all paths and files need to be available in their final, absolute form.</p>
- </div>
- </div>
- </div>
- <div class="sect1">
- <h2 id="create-3d-models">Create 3D Models</h2>
- <div class="sectionbody">
- <div class="paragraph">
- <p>Install a mesh editor such as <a href="jme3/external/blender.html">Blender</a> or 3D Studio MAX. Reuse textures and materials as much as possible. <strong>Consult the mesh editor’s documentation for specific details how to do the following tasks.</strong></p>
- </div>
- <div class="olist arabic">
- <ol class="arabic">
- <li>
- <p>Create 3D models in a mesh editor.</p>
- <div class="olist loweralpha">
- <ol class="loweralpha" type="a">
- <li>
- <p>Create efficient <strong>low-polygon models</strong>. High-polygon models may look pretty in static 3D art contests, but they slow down dynamic games!</p>
- </li>
- <li>
- <p><a href="jme3/advanced/j3m_material_files.html">Create materials</a> for your models either in the 3D editor, or in the jME3 SDK. Only use the following material features: <strong>Diffuse Map or Diffuse Color (minimum); plus optionally Normal Map, Glow Map, Specular Map.</strong><br>
- Every material feature not listed in the <a href="jme3/advanced/materials_overview.html">Materials Overview</a> is unsupported and ignored by JME3’s renderer.</p>
- </li>
- <li>
- <p>Unwrap the model in the 3D editor and generate a <strong>UV texture</strong> (i.e. one texture file that contains all the pieces of one model from different angles).<br>
- Don’t use multiple separate texture files with one model, it will break the model into several meshes.</p>
- </li>
- </ol>
- </div>
- </li>
- <li>
- <p>Export the model mesh in one of the following formats: <strong>.blend, Wavefront .OBJ/.MTL, Ogre .mesh/.material/.scene</strong>.</p>
- <div class="olist loweralpha">
- <ol class="loweralpha" type="a">
- <li>
- <p><strong>Bake</strong> each texture into one file when exporting. Create a Texture Atlas.</p>
- </li>
- <li>
- <p><strong>Save exported models to subfolders of the <code>assets/Textures</code> (sic) directory, so they are together with their textures</strong>!</p>
- </li>
- </ol>
- </div>
- </li>
- </ol>
- </div>
- <div class="paragraph">
- <p>See also: <a href="http://www.gamasutra.com/view/feature/2530/practical_texture_atlases.php">Texture Atlases on gamasutra</a></p>
- </div>
- <div class="paragraph">
- <p><strong>When I load the model in JME3, why does it look different than in the 3D editor?</strong>+
- <a href="jme3/advanced/materials_overview.html">focus on features that game engines support</a></p>
- </div>
- </div>
- </div>
- <div class="sect1">
- <h2 id="convert-3d-models-to-j3o-format">Convert 3D Models to .j3o Format</h2>
- <div class="sectionbody">
- <div class="paragraph">
- <p>Convert all models and scenes to jME3’s binary .j3o format to load() them. You use the jMonkeyEngine SDK to do the conversion.</p>
- </div>
- <div class="olist arabic">
- <ol class="arabic">
- <li>
- <p>Confirm that you exported the model into the <code>assets/Textures</code> directory (or subdirectories) together with all its textures.</p>
- </li>
- <li>
- <p>In the SDK, right-click the model and choose “Convert to j3o Binary.<br>
- The paths in the j3o now reference files with an absolute <code>assets/Textures/…</code> path.</p>
- </li>
- <li>
- <p>Now, move the .j3o into the corresponding <code>assets/Models/</code> or <code>assets/Scenes/</code> directory.</p>
- </li>
- <li>
- <p>Use the AssetManager to load() the .j3o files.</p>
- </li>
- </ol>
- </div>
- <div class="paragraph">
- <p>This process ensures that the texture paths are correct, and it also keeps your <code>assets/Models</code> folder free from textures. You can reuse your set of textures for many models.</p>
- </div>
- <div class="sect2">
- <h3 id="must-i-convert-to-j3o-yes">Must I convert to .j3o? Yes!</h3>
- <div class="paragraph">
- <p>The .j3o file format is an optimized format to store parts of a jME3 scene graph for 3-D games.</p>
- </div>
- <div class="ulist">
- <ul>
- <li>
- <p>A .j3o file can contain one shape, one model, or a whole scene.</p>
- </li>
- <li>
- <p>Only .j3o files can store all of jme3’s material options and other features. Other formats can only be considered meshes with UV mapping data and always need extra work.</p>
- </li>
- <li>
- <p>.j3o files work seamlessly across platforms and can also be automatically adapted for certain platforms on distribution.</p>
- </li>
- <li>
- <p>(Optional) You can store the model’s physical properties, materials, lights, particle emitters, and audio nodes, in the .j3o file.<br>
- Use Java commands, or use the <a href="sdk/scene_composer.html">jMonkeyEngine SDK SceneComposer</a> as a user-friendly interface to add these properties.</p>
- </li>
- <li>
- <p>The default Ant build script copies .j3o files, .j3m files, sounds, and textures, into the distributable JAR automatically.</p>
- </li>
- </ul>
- </div>
- <div class="paragraph">
- <p><code>dist</code><strong>Runtime Error</strong>–</p>
- </div>
- </div>
- </div>
- </div>
- <div class="sect1">
- <h2 id="see-also">See Also</h2>
- <div class="sectionbody">
- <div class="ulist">
- <ul>
- <li>
- <p><a href="jme3/advanced/save_and_load.html">Save and Load</a></p>
- </li>
- <li>
- <p><a href="sdk/model_loader_and_viewer.html">Model Loader and Viewer</a>
- <tags><tag target="spatial" /><tag target="node" /><tag target="mesh" /><tag target="geometry" /><tag target="scenegraph" /><tag target="sdk" /></tags></p>
- </li>
- </ul>
- </div>
- </div>
- </div>
- </div>
- <div id="footer">
- <div id="footer-text">
- Last updated 2016-05-21 23:44:18 UTC
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