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<td >Qt 5.12</td><td ><a href="qt3d-index.html">Qt 3D</a></td><td >Qt 3D: Basic Shapes C++ Example</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qt3d-index.html">Qt 5.12.2 Reference Documentation</a></td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#running-the-example">Running the Example</a></li>
<li class="level1"><a href="#setting-up-a-torus-mesh">Setting Up a Torus Mesh</a></li>
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<h1 class="title">Qt 3D: Basic Shapes C++ Example</h1>
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<p>Shows four basic shapes that Qt 3D offers and sets up a mesh for each of them.</p>
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<p class="centerAlign"><img src="images/basicshapes-cpp-example.jpg" alt="" /></p><p><i>Basic Shapes</i> shows four basic shapes that Qt 3D offers: a torus, a cylinder, a cube, and a sphere. The example also shows how to embed a Qt 3D scene into a widget and connect with other widgets.</p>
<a name="running-the-example"></a>
<h2 id="running-the-example">Running the Example</h2>
<p>To run the example from Qt Creator, open the <b>Welcome</b> mode and select the example from <b>Examples</b>. For more information, visit Building and Running an Example.</p>
<a name="setting-up-a-torus-mesh"></a>
<h2 id="setting-up-a-torus-mesh">Setting Up a Torus Mesh</h2>
<p>As an example, we go through how to set up a torus mesh. First, we instantiate the <code>QTorusMesh</code>, and then we set the mesh specific parameters, which for torus are radius, minor radius, and the number of rings and slices.</p>
<pre class="cpp">
m_torus <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qt3dextras-sub-qt3d.html">Qt3DExtras</a></span><span class="operator">::</span><span class="type">QTorusMesh</span>();
m_torus<span class="operator">-</span><span class="operator">></span>setRadius(<span class="number">1.0f</span>);
m_torus<span class="operator">-</span><span class="operator">></span>setMinorRadius(<span class="number">0.4f</span>);
m_torus<span class="operator">-</span><span class="operator">></span>setRings(<span class="number">100</span>);
m_torus<span class="operator">-</span><span class="operator">></span>setSlices(<span class="number">20</span>);
</pre>
<p>The size and position of the torus can be adjusted with transform components. We create scale, translation, and rotation components and add them into the <code>QTransform</code> component.</p>
<pre class="cpp">
<span class="type"><a href="qt3dcore-module.html">Qt3DCore</a></span><span class="operator">::</span><span class="type">QTransform</span> <span class="operator">*</span>torusTransform <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qt3dcore-module.html">Qt3DCore</a></span><span class="operator">::</span><span class="type">QTransform</span>();
torusTransform<span class="operator">-</span><span class="operator">></span>setScale(<span class="number">2.0f</span>);
torusTransform<span class="operator">-</span><span class="operator">></span>setRotation(<span class="type">QQuaternion</span><span class="operator">::</span>fromAxisAndAngle(QVector3D(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>)<span class="operator">,</span> <span class="number">25.0f</span>));
torusTransform<span class="operator">-</span><span class="operator">></span>setTranslation(QVector3D(<span class="number">5.0f</span><span class="operator">,</span> <span class="number">4.0f</span><span class="operator">,</span> <span class="number">0.0f</span>));
</pre>
<p>To change the diffuse color of the mesh, we create a <code>QPhongMaterial</code> and set its diffuse color.</p>
<pre class="cpp">
<span class="type"><a href="qt3dextras-sub-qt3d.html">Qt3DExtras</a></span><span class="operator">::</span><span class="type">QPhongMaterial</span> <span class="operator">*</span>torusMaterial <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qt3dextras-sub-qt3d.html">Qt3DExtras</a></span><span class="operator">::</span><span class="type">QPhongMaterial</span>();
torusMaterial<span class="operator">-</span><span class="operator">></span>setDiffuse(<span class="type">QColor</span>(<span class="type">QRgb</span>(<span class="number">0xbeb32b</span>)));
</pre>
<p>The final step is to add the torus into an entity tree, and we do that by creating a <code>QEntity</code> with a parent entity and adding the previously created mesh, material, and transform components into it.</p>
<pre class="cpp">
m_torusEntity <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qt3dcore-module.html">Qt3DCore</a></span><span class="operator">::</span><span class="type">QEntity</span>(m_rootEntity);
m_torusEntity<span class="operator">-</span><span class="operator">></span>addComponent(m_torus);
m_torusEntity<span class="operator">-</span><span class="operator">></span>addComponent(torusMaterial);
m_torusEntity<span class="operator">-</span><span class="operator">></span>addComponent(torusTransform);
</pre>
<p>We can control the visibility of the entity by defining whether it has a parent or not. That is, whether it is part of an entity tree or not.</p>
<pre class="cpp">
<span class="type">void</span> SceneModifier<span class="operator">::</span>enableTorus(bool enabled)
{
m_torusEntity<span class="operator">-</span><span class="operator">></span>setEnabled(enabled);
}
</pre>
<p>Files:</p>
<ul>
<li><a href="qt3d-basicshapes-cpp-basicshapes-cpp-pro.html">basicshapes-cpp/basicshapes-cpp.pro</a></li>
<li><a href="qt3d-basicshapes-cpp-main-cpp.html">basicshapes-cpp/main.cpp</a></li>
<li><a href="qt3d-basicshapes-cpp-scenemodifier-cpp.html">basicshapes-cpp/scenemodifier.cpp</a></li>
<li><a href="qt3d-basicshapes-cpp-scenemodifier-h.html">basicshapes-cpp/scenemodifier.h</a></li>
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