Interface ForceFieldSystemOptions

Fields to register immediately, in order. Equivalent to calling ForceFieldSystem.addField for each. wakesSleepingBodies defaults to false when omitted, matching ForceFieldAddOptions.

Execution order key (§39). Defaults to PRIORITY_FORCES (500) — step 5, "force generation", which runs before PhysicsSystem's solve at 600. Read once, at registration, like every other system's priority.

Worlds to track immediately, in order. Equivalent to calling ForceFieldSystem.track for each, which is what the constructor does.