Interface FollowOptions

Consulted on every update tick; a false return pauses emission while the target is off-screen or paused, without consumer bookkeeping. Particles already alive still finish their lives, and an explicit burst() always fires - the callback gates the tick, not the call.

added to the target position on every sync

Consulted on every update tick; a false return hides the emitter and every particle it has in the air, so a fog-of-war gate keeps an aura's spray out of unexplored space without the consumer re-placing visible every frame. Drawing only: the simulation keeps stepping behind the invisibility, emission keeps following enabled, and detach() stops consulting the hook and leaves the emitter visible.