Unity ECS - Game Torrahod

World, system groups, update order, and the player loop

If you have started using ECS, you might have heard of the "default world". You may notice that your defined systems are somehow updating magically. In this article, we will learn about that in reversed order.

Unity ECS

Tag component

Tag component or "zero-sized component" is a special case in Unity ECS where IComponentData doesn't contain any field. The use is to intentionally separate entities to more chunks because a chunk is defined by one set of archetype.

Unity ECS

Burst and the generated assemblies : how smart is it?

In this article, I will challenge Unity's Burst compiler with various job code, and we will along the way learn about what's performant for the game. Get ready for the great assembly adventure, Unity had never been so hardcore about stuff this low level!

Unity ECS

Everything about ISharedComponentData

This is one of the most misunderstood feature of ECS. Usually results in question like "How could I get SCD data in a job? I can't? Useless!" when you don't know how it was designed. So let's get to know how it works throughly.

Unity ECS

Designing an efficient system with version numbers

"Change version" are numbers book keeped throughout ECS database already by default. By using them, you could be skipping unnecessary works. Let's see how they works, and how much we could skip.

Unity ECS

NativeArrayFullSOA and NativeArrayChunked8

You used ECS in order to fast iterate through the same kind of components across multiple objects (entity) instead of the old OOP way. Could the same concept can be applied to even smaller level : each field in the struct?

Unity ECS

Minimum main thread block with `out JobHandle` overload

There are 3 interesting methods on EntityQuery that has an overload with out JobHandle :public NativeArray<ArchetypeChunk> CreateArchetypeChunkArray(Allocator allocator); public NativeArray<ArchetypeChunk> CreateArchetypeChunkArray(Allocator allocator, out JobHandle jobhandle)

Unity ECS

ECS Singleton Data

You have these API to work with singleton data but how do they really works?system.GetSingleton<T>system.SetSingleton<T>(T data)entityQuery.GetSingleton<T>entityQuery.

Unity ECS

GameObject conversion ecosystem code tour

You can just give your GameObject to GameObjectConversionUtility static class and witness the magic. But it's always nice to know what it does inside so you are sure it really suits your need,

Unity ECS

The Chunk data structure

Recently I have tackled the ECS serialization which serialize the Chunk struct in a very straight forward way. Along the way I learned about it which I would like to summarize here.

Unity ECS

Batched operations on EntityManager

Jobs aren't always the fastest for all operations. EntityManager operation mostly have to cause structural change on the main thread. Let's see how we could speed this up.

Unity ECS

EntityCommandBuffer MinimumChunkSize

One chunk can hold multiple commands. The most efficient (performance wise) is to allocate large enough chunk that it does not expand.

Unity ECS

Magical places that store arbitrary object types

Unity ECS is not all about high performance subset of C# and struct works. Knowing about how it deals with reference types can help you…

Unity ECS

Various noise functions

They are all generated using Unity.Mathematics library. But the general definition could be applied elsewhere.

Unity ECS

Unity.Mathematics vs Mathf.

Unity’s Mathf is not 100% replacable with its burst-friendly Unity.Mathematics . Also Unity.Mathematics evolves all the time.