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diff --git a/ml/dlib/examples/3d_point_cloud_ex.cpp b/ml/dlib/examples/3d_point_cloud_ex.cpp
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+++ b/ml/dlib/examples/3d_point_cloud_ex.cpp
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+// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
+/*
+
+    This is an example illustrating the use of the perspective_window tool
+    in the dlib C++ Library.  It is a simple tool for displaying 3D point 
+    clouds on the screen.
+
+*/
+
+#include <dlib/gui_widgets.h>
+#include <dlib/image_transforms.h>
+#include <cmath>
+
+using namespace dlib;
+using namespace std;
+
+// ----------------------------------------------------------------------------------------
+
+int main()
+{
+    // Let's make a point cloud that looks like a 3D spiral.
+    std::vector<perspective_window::overlay_dot> points;
+    dlib::rand rnd;
+    for (double i = 0; i < 20; i+=0.001)
+    {
+        // Get a point on a spiral
+        dlib::vector<double> val(sin(i),cos(i),i/4);
+
+        // Now add some random noise to it
+        dlib::vector<double> temp(rnd.get_random_gaussian(),
+                                  rnd.get_random_gaussian(),
+                                  rnd.get_random_gaussian());
+        val += temp/20;
+
+        // Pick a color based on how far we are along the spiral
+        rgb_pixel color = colormap_jet(i,0,20);
+
+        // And add the point to the list of points we will display
+        points.push_back(perspective_window::overlay_dot(val, color));
+    }
+
+    // Now finally display the point cloud.
+    perspective_window win;
+    win.set_title("perspective_window 3D point cloud");
+    win.add_overlay(points);
+    win.wait_until_closed();
+}
+
+//  ----------------------------------------------------------------------------
+