+This application uses the _depth_ framework to load and display 3D models.
+It also applies the _flat_ framework to display the static UI elements (like the "Next model" label).
+
+The pretty earth model (`GlobeModel`) is implemented by a material with a custom graphical program.
+It renders the earth with an displaced surface, a cloud layer, city lights and Phong lighting effects on the water.
+
+# Variations
+
+* For the desktop, the application is compiled to `bin/model_viewer`.
+
+ This variation can show more models specified on the command line.
+
+ ~~~raw
+ bin/model_viewer [path_to_model ...]
+ ~~~
+
+* For Android, the standard application is compiled to `bin/model_viewer.apk`.
+* The virtual reality variant `bin/model_viewer_vr.apk` targets Android and uses Google Cardboard for head tracking.
+