SuperHOT VR meets Fear of Number 13 for JS13KGAMES 2024
motion-tracker component flags its entity with the 'player-moving' state if the entity has changed position or rotation between the last tick and the current one.
It is applied to the <a-camera> primitive and <a-entity> with hand-controls component to detect the player moving its head, body or hands
game-time system keeps track of the game time and only update it if the player is moving by checking with each entity with motion-tracker components (head, body, hands) when they have the player-moving state.
It emits a step event (given tick is already reserved by AFRAME) for whichever component or system interested in consuming the new game-time (typically the ones moving things around)
game-time component update its entity's text component's value with the current game-time
puppeteer system listens to step events and update each puppet's position
puppet component is currently an empty component used for puppeteer to mark which entities it must move.
gesture-tracker component keeps track of which game actions are made on one hand controller (grabbing, shooting) and game entity it is colliding with (hovering-portal, hovering-gun). It is apply to each entity with hand-controls component.
gesture-tracjer system check each hand controller actions and triggers relevant transition (e.g. grabbing a portal loads the next level, grabbing a gun makes the gun follow the hand, dropping a gun leaves the gun at the last hand position...)
portal component setup an obb-collider on its entity so it can be hovered and grabbed, and keeps track of which level should be loaded.
sync-stance component copies the position and rotation of a target entity to its entity on every tick. It is used to make the gun follow the hand (since adding the gun as a child of the hand controller entity doesn't render the gun)
a-gun primitive is an assembly of other primitives depicting a gun pointing forward.
a-pyramid primitive is an assembly of other primitives depicting a pyramid pointing face up.
Lifecycle
comp.motion-tracker -> player-moving state -> sys.game-time -> step event -> sys.puppeteer
comp.gesture-tracker -> grabbing state -> hovering-portal state -> hovering-gun state -> shooting state
grabbing + hovering-portal states -> sys.gesture-tracker -> loadlevel event
grabbing + hovering-gun states -> sys.gesture-tracker -> holding-gun state + comp.sync-stance on
holding-gun + !grabbing states -> sys.gesture-tracker -> - comp.sync-stance on