OPAL (Open Physics Abstraction Layer) has two main
goals: to provide a high-level physics interface,
and to provide an abstract interface that is
independent of the underlying physics engines.
Although some similar libraries focus mainly on
the second goal, OPAL is more focused on the
high-level physics interface. Even though the
abstract interface is important for comparing
physics engines or using multiple physics engines
in the same application, the primary concern is
giving developers a simple, powerful interface
with high-level constructs.
