-It is possible to use a single Object for rendering multiple identical or
-similar objects. See class ObjectInstance.
+In many cases, it's desirable to include multiple copies of an Object in a
+Scene, with different model matrices. ObjectInstances can be used to alter the
+rendering of an object on a per-instance basis.
+
+Objects can have multiple levels of detail. The most detailed level has index
+0, with increasing indices having less detail. When rendering an instance, the
+instance's get_level_of_detail method is called to determine which LoD to use.