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Entitas - The Entity Component System Framework for C# and Unity
Entitas is the most popular open-source Entity Component System Framework (ECS)
and is specifically made for C# and Unity. Several design decisions have been
made to work optimal in a garbage collected environment and to go easy on the
garbage collector. Entitas comes with an optional code generator which radically
reduces the amount of code you have to write and
makes your code read like well written prose.
Why Entitas
Video Tutorials and Unity Unite Talks
First glimpse
The optional code generator
lets you write code that is super fast, safe and literally screams its intent.
var entity = context.CreateEntity();
entity.AddPosition(Vector3.zero);
entity.AddVelocity(Vector3.forward);
entity.AddAsset("Player");
using static GameMatcher;
public sealed class MoveSystem : IExecuteSystem
{
readonly IGroup<GameEntity> _group;
public MoveSystem(GameContext context)
{
_group = context.GetGroup(AllOf(Position, Velocity));
}
public void Execute()
{
foreach (var e in _group.GetEntities())
e.ReplacePosition(e.position.value + e.velocity.value);
}
}
Overview
Entitas is fast, light and gets rid of unnecessary complexity. There are less
than a handful classes you have to know to rocket start your game or application:
- Context
- Entity
- Component
- Group
Entitas ECS
+-----------------+
| Context |
|-----------------|
| e e | +-----------+
| e e--|----> | Entity |
| e e | |-----------|
| e e e | | Component |
| e e | | | +-----------+
| e e | | Component-|----> | Component |
| e e e | | | |-----------|
| e e e | | Component | | Data |
+-----------------+ +-----------+ +-----------+
|
|
| +-------------+ Groups:
| | e | Subsets of entities in the context
| | e e | for blazing fast querying
+---> | +------------+
| e | | |
| e | e | e |
+--------|----+ e |
| e |
| e e |
+------------+
Read more…
Code Generator
The Code Generator generates classes and methods for you, so you can focus on
getting the job done. It radically reduces the amount of code you have to write
and improves readability by a huge magnitude. It makes your code less error-prone
while ensuring best performance.
Read more…
Unity integration
The optional Unity module “Visual Debugging” integrates Entitas nicely into Unity and provides powerful
editor extensions to inspect and debug contexts, groups, entities, components and systems.
Read more…
Entitas deep dive
Read the wiki or checkout the example projects to
see Entitas in action. These example projects illustrate how systems, groups, collectors and entities all play together seamlessly.
Download and setup Entitas
GitHub releases (recommended)
Show releases
Unity package manager
Coming soon
NuGet
Entitas and all dependencies are available as NuGet packages.
More detailed explanation coming soon.
Unity Asset Store (deprecated)
Entitas on the Unity Asset Store is deprecated and will not
be updated anymore. The last version available on the Asset Store is 1.12.3 and
is free to download. Please see discussion Entitas turns 7 - and is FREE now
Thanks to
Big shout out to @mzaks, @cloudjubei and @devboy
for endless hours of discussion and helping making Entitas awesome!
Maintainers
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