-Represents a single instance of an Object. Thanks to being derived from
-Placeable in can be positioned without additional effort. Other instance
-parameters can be set by overriding the hook functions.
+Represents a single instance of an Object. A model matrix is provided through
+the Placeable base class.
+
+The state used to render the object can be customized by overriding the
+setup_render() and finish_render() functions.