public void collide() {
// Update awake contacts.
for (Contact c = m_world.m_contactList; c != null; c = c.getNext()) {
final Body body1 = c.getShape1().getBody();
final Body body2 = c.getShape2().getBody();
if (body1.isSleeping() && body2.isSleeping()) {
continue;
}
c.update(m_world.m_contactListener);
}
}
