title: Increase point size of point cloud in PCL for visualization
body: <p>I am visualizing two point clouds inside PCL Visualizer. Below is the code snippet:</p>
  <pre><code>#include &lt;pcl/io/pcd_io.h&gt;
  #include &lt;pcl/visualization/pcl_visualizer.h&gt;
  
  int main (int argc, char** argv)
  {
      pcl::visualization::PCLVisualizer viewer(&quot;Cloud Viewer&quot;);
  
      pcl::PointCloud&lt;pcl::PointXYZRGBA&gt;::Ptr face (new pcl::PointCloud&lt;pcl::PointXYZRGBA&gt;);
      pcl::io::loadPCDFile (&quot;face.pcd&quot;, *face);
  
      pcl::PointCloud&lt;pcl::PointXYZ&gt;::Ptr nose (new pcl::PointCloud&lt;pcl::PointXYZ&gt;);
      pcl::io::loadPCDFile (&quot;nose.pcd&quot;, *nose);
  
      viewer.addPointCloud(face,&quot;face&quot;);
      viewer.addPointCloud(nose, &quot;nose&quot;);
      
      viewer.spin();
      return 0;
  }
  </code></pre>
  <p>I want to increase the point size of the <code>nose</code> point cloud. Please note that pressing <code>+</code> key increases the point size for the complete window.</p>