Drawable components like Entity2D or Entity3D will interpolate between update ticks. NextUpdateStarted marks the beginning of an update tick to copy interpolatable data, it can also be used to check if any data has changed since last time and if something needs updating. View code on GitHub

Keeps a list of all active entities and manages all behaviors for entities. Updating is done at a fixed time step (e.g. 0.1). Drawing has read-only access, it runs as quickly as possible (60fps+). Details: http://gafferongames.com/game-physics/fix-your-timestep/ View code on GitHub

Each entity has a name, unique components for data and behaviors for logic attached to them. Entities are used for all engine objects, rendering, game objects, ui, physics, etc. View code on GitHub

Easily access the current update time step delta, which defaults to 0.05 (20 updates/sec). View code on GitHub

Goes through all entities of a specific type each update tick. View code on GitHub

Abstract factory to provide access to create entity behaviors on demand via the resolver. View code on GitHub

Draws all entities at the same level of priority. View code on GitHub

Allows entities to be easily filtered so that only specific ones are updated. View code on GitHub

Certain entities need to be updated more often than normally - eg. Physics. RapidUpdate is called 60 times per second by default (no matter how fast the game runs). If IsPauseable returns true, when the app is paused RapidUpdate will not get called. View code on GitHub

Adding this interface to an Entity will cause its Update method to get called at, by default, 20 times per second, at the given UpdatePriority for each active entity. If IsPauseable returns true, when the app is paused Update will not get called. View code on GitHub

Entity behaviors are processed in order from First priority to Last. Normal is the default. View code on GitHub

The type of processing EntitiesRunner is currently undertaking. View code on GitHub