Overview

This section describes the engine’s internals: the model each subsystem imposes on a game, how that subsystem behaves, and why it is shaped that way. It states the model and the guarantees; the exact surface is at APIs and the idioms are at Usage.

Four properties run through every page. A game reaches the engine through the framework object it is inside rather than through a global. Input reaches the simulation only through a controller. Drawing happens only in the rendering pipeline. Everything the engine observes it broadcasts as an event a caller subscribes to.

Pages

Page	Covers
Frame	The loop, the fixed frame order, simulated time, the clock behind delta time, and pausing.
World	What a level describes, what opening one builds, the transition sequence, and what crosses it.
Gameplay Framework	The game instance, the game mode, the game state, and the player states, and what each one is scoped to.
Actors and Components	Actors as the things in a world, components as the behavior and appearance attached to them, and the deferred destroy.
Possession	Controllers as the one path from input to the simulation, possessing a pawn, and driving the same pawn from a player or a bot.
Rendering	The declarative pipeline, the layer ordering, the render modes, and the direct-drawing path.
Camera and Viewport	The three spaces, the camera’s projection, following and bounds, and the letterboxed fit.
Collision	Channels and responses, the pairs the engine reports, the manifold, and the queries.
Input	Named actions over bindings, magnitudes and edges consumed per controller, the pointer, and the touch layout catalogue.
Audio	Synthesized and file-backed cues, the first-interaction unlock, and the cue events.
Assets	The single asset root, path resolution, and the load events.
Diagnostics	The instance and world registries, the overlay drawn in device space, and the frame metrics.
Debug Surface	The object initialize returns, whose poses and readings act on the live world and are driven from code.
Recording	The wrapper over the context the pipeline draws through, per-frame inherited state, and independently drawable frames.