|fixture||the index of the fixture|
|flag||whether a fixture is awake (true) or not (false)|
When you start a room with physics, or bind fixtures to
instances, the fixtures are always considered to be "awake"... that
is to say, they are processing events and interacting with the
surrounding instances. However this can sometimes lead to problems,
especially if you have a number of instances with fixtures that are
side by side when a room starts (think of a tower made of various
instances with fixtures) as with them being "awake" they will move
and possibly change position due to the sudden start of gravity and
collisions affecting them. In these cases you can use this function
to flag the fixture as been "asleep", in which case it will not be
processing anything when it is first created in the room.
The code above flag the fixture as being "awake" when bound to an instance.