Optionaloptions: PhysicsSystemOptionsWhether this system dispatches its worlds' queued events itself (§39 step 9), as opposed to leaving step 9 to another system.
Fixed at construction: moving dispatch between priorities mid-run would deliver one step's events at two different points in the order, which is exactly the ambiguity §39's "explicit" forbids.
How many worlds are tracked.
The tracked worlds, in the order they are stepped.
Records that some other system dispatches this system's worlds' events, so that the "nobody is draining the queue" warning stays silent.
PhysicsEventSystem calls this on itself at construction; call it
yourself if you drive PhysicsWorld.dispatchEvents from your own system or
from application code. Idempotent, and a no-op on a system that dispatches
its own events.
Stops stepping everything. The system stays registered.
Drops every tracked world (§39 teardown).
Deliberately does not dispose them: the system drives worlds, it does
not own them, and PhysicsWorld.dispose also disposes the solver adapter.
Steps every tracked world by time.fixedDeltaTime seconds, then dispatches
every world's queued events (§39 steps 6 and 9).
The delta is the scaled simulation delta: §10 puts timeScale in the
scheduler's accumulator, so a fixed step already is one fixedDeltaTime
of simulation time and multiplying by timeScale here would scale it twice.
The two passes iterate a live array. A listener that untracks a world during dispatch therefore skips that world's own dispatch if it has not run yet — the same "mutate outside the step" caveat every system in the engine carries. Allocates nothing.
No per-registration setup is needed (§39).
Starts stepping world and returns it, so a world can be built and tracked
in one expression.
Stops stepping world. Returns whether it was tracked.
Steps every tracked PhysicsWorld once per fixed step, then dispatches every world's events (§39 steps 6 and 9).
See the module header for the two-pass ordering, the multi-world rationale, and what the system deliberately leaves to the application.