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<h3 class="article-title"><a href="http://opengamestudio.org/osg-sample.html" rel="bookmark"
title="Permalink to OpenSceneGraph sample">OpenSceneGraph sample</a></h3>
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<h6 class="subheader" title="2017-05-12T00:00:00+03:00">Пт 12 мая 2017
<a class="button secondary small translation-button" href="http://opengamestudio.org/osg-sample-ru.html">ru</a>
</h6> <p><img alt="OSG sample" src="http://opengamestudio.org/2017-05_osg-sample.png"></p>
<p>This article describes creation of the tutorials for building sample OpenSceneGraph application under Linux, macOS, Windows, and Android in April 2017.</p>
<p>Previous tutorials described how to install OpenSceneGraph under Linux, macOS, Windows and render a model using the standard <strong>osgviewer</strong> tool. This time we worked on a <a href="https://github.com/OGStudio/openscenegraph-cross-platform-guide-application">sample OpenSceneGraph application</a> that would run under Linux, macOS, Windows, and Android.</p>
<p>The application is very basic and has the following features:</p>
<ol>
<li>Render window creation</li>
<li>Model loading</li>
<li>Model rendering with simple GLSL shaders</li>
<li>Model motion with a mouse under Linux, macOS, Windows and a finger under Android</li>
</ol>
<p>Creating the tutorials for Linux, macOS, Windows was so easy and straightforward, that it only took us half a month. We spent the second half of the month creating Android tutorial.</p>
<p>Our <a href="http://opengamestudio.org/2016-october-recap.html">first successful Android build</a> last year included hacks and non-obvious steps to make OpenSceneGraph run under Android. This time we wanted a cleaner, faster, and cheaper approach.</p>
<p>The approach we ended up with requires just a few files and a few changes to the original Android Studio project (with C++ support) to make sample OpenSceneGraph application run under Android.</p>
<p>Here's a quick rundown of the files:</p>
<ol>
<li>GLES2 surface</li>
<li>Render activity to render to the surface</li>
<li>Native library Java interface</li>
<li>Native library C++ implementation</li>
<li>CMake file to build native library</li>
<li>Render activity layout</li>
<li>Model to display</li>
</ol>
<p>Here's a quick rundown of the project changes:</p>
<ol>
<li>Update Android manifest to use GLES2 and render activity</li>
<li>Reference native library's CMake file in the project's CMake file</li>
</ol>
<p>OpenSceneGraph documentation suggests building OpenSceneGraph outside Android Studio with CMake. However, this approach has the following limitations:</p>
<ol>
<li>You have to build OpenSceneGraph for each target architecture</li>
<li>You have to manually copy/reference built OpenSceneGraph libraries into Android Studio project</li>
</ol>
<p>Our approach includes building OpenSceneGraph for those target architectures that Android Studio project is built for. Also, OpenSceneGraph is already referenced, so no extra work is required: you just need to rebuild the project, and you're done.</p>
<p>That's it for describing the creation of the tutorials for building sample OpenSceneGraph application under Linux, macOS, Windows, and Android in April 2017.</p>
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