Questions tagged [component-based]
Component-based designs rely on separating the multiple logical attributes of business objects and game objects into small components dedicated only to specific tasks. Whereas game objects are usually modeled to reproduce the attributes and behavior of "real world" objects by aggregating them together and allowing specialized objects to inherit from general ones, component based design relies on composition rather than inheritance.
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What should be an entity/component, and what shouldn't?
I've recently been reading the book Game Programming Patterns by Bob Nystrom, and one chapter I've found a bit hard to grip is the chapter about the Component pattern.
In the example he uses (which ...
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29 views
ECS multithreading without value types?
Im working with an Java based ECS framework called "Artemis ODB".
Its great so far but it lacks multithreading or jobs.
So i wanted to add them by myself. I actually wanted to give each job ...
5
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1answer
190 views
How to make a component solution in Godot (similar to Unity's)
I want to be able to assign multiple scripts to a single node, and have each script become a component.
I know there is an asset in the asset library for a component solution: godot-component-system. ...
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1answer
346 views
Component-based ability system for turn-based rpg
I am trying to make a component-based ability system for my new turn based game that I am working on. I not sure with the architecture and the approach I am following.
So here my idea:
Every Ability ...
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1answer
498 views
How to Implement ECS Archetypes in C#?
I'm trying to figure out how to implement a simple ECS with an Archetype approach, similar to what Unity's ECS uses.
An archetype is just a category for entities that have a specific set of components....
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51 views
How to draw the player standing behind a tree in an Entity Component System?
I'm making a top-down Javascript canvas game using the Entity Component System architecture.
For an entity to be drawn on the screen every frame, it needs a ...
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1answer
50 views
Should abilities have their state and functionality separated?
I'm developing a top-down game using Javascript and Canvas in an ECS architecture.
I'm wondering, which of these is better from a design / elegance point of view?
Method 1: Combining the ability ...
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68 views
Cannot decide between using a MessageBus and entities for events in my ECS game
For example, let's say that the player walks into an enemy and in response, a chain of events should occur (such as: his score goes up, the enemy dies, a cinematic starts, etc.)
I see two "proper&...
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1answer
207 views
Two Colliders on the same GameObject for different purposes
I'm somewhat new to Unity and am trying to build a battle system.
Right now, I have an attack that checks collisions with enemy objects like this:
...
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0answers
79 views
Entity Component System: Dependency Between Systems
Inspired by the Entity Component System Architecture, I started to refactor my 2D tiled-based game to follow the rule "favor composition over inheritance".
However, after writing the ...
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1answer
632 views
Component instance reference in Unreal Engine 4
I'm creating a C++ script and I want to get a reference to a component instance.
For example, imagine that I want to get the player camera, which is a ...
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1answer
308 views
Component Based Spells/Abilities
This has been a bit of a long time coming challenge for me, if you look back at previous questions for Component based spells you are likely to find my old questions, given that they are 1 + 2 years ...
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135 views
C++ OpenGL: Object Components
I've been trying to make a barebones engine/game in VS C++ with OpenGL.
So far it's worked well, I've managed to render two green triangles on the screen and can accelerate one using WASD input.
...
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0answers
32 views
How would I go about creating dynamic weapons using EC architecture?
I currently have a weapon component that contains common functionality across weapons (mainly guns).
...
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0answers
66 views
Unity Vector3 y and z Components being set 0
So I'm working on an RTS game and I'm trying to set pre-defined positions for units using my own formula. It takes the list of units and makes a position for each one in an array. The array then goes ...
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1answer
148 views
Should fields in components in an ECS use polymorphism?
I've just started to try and learn how to use ECS (Entity component systems), but I'm having trouble understanding the concepts behind components.
Should adding more types of components, or trying to ...
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1answer
146 views
Where should I put units and items in a squad-combat ECS-based game?
So I'm working on a game where squads of varied units would explore, fight, trade and build on an overworld map. Combat would be automated more or less, and happen on the overworld. Basically, ...
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1answer
2k views
Unity get component throwing NullReferenceException only in standalone build
I'm having a very frustrating issue with GetComponent().
...
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2answers
839 views
In Unreal Engine 4, how do I get the component's "game object" via C++?
I have an ACharacter instance with a weapons component that inherits from UActorComponentattached to it. I'm currently writing ...
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1answer
2k views
Dealing with more complex entities in an ECS architecture
Preamble: I'm working on a level editor for my engine, which uses an ECS architecture. I have around a dozen component types so far, mostly dealing with graphics, like lighting components, model, and ...
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1answer
378 views
Pass data down to components
In the game I have, I'm using an architecture close to what I've seen of Unity components :
Basically, the universe implements the game loop, entities implement and ...
2
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1answer
1k views
Should components in Entity Component System pattern have logic?
Is often read that in entity component system pattern we should treat components just as a passive data structure with no logic at all, this way we follow to a data oriented design approach with ...
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1answer
145 views
Why even use coroutines in Unity?
I have been thinking about the use of Unity's coroutines recently, and while I've used them in the past, and am already aware of their bad reputation (although I've also seen posts on the unity forums ...
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2answers
163 views
How do you make sure that a component can be applied to very different entities?
I know there's lots of posts about this sort of thing, and I've read a lot of them, but there's some gaps that I can't seem to fill in my head.
Specifically, I've been reading about the SOLID ...
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2answers
424 views
Best Practice for Validating Components in Unity/C#?
In my game there's a Unit class, which all soldiers use. Not all soldiers have special abilities which require unique class components (like Stealth class). Special abilities either exist on a unit ...
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1answer
82 views
How to react properly to component field changes?
Let's say, that we have the following components:
Direction, which contains direction the object moves:
...
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2answers
172 views
How to: Duplicating and updating component data in systems
I am new to game development. Coming across the ECS (entity-component system) pattern I generally quite liked the idea. I have implemented the current version of my engine using the OOP style approach....
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2answers
958 views
Appropriate Cache Friendly Associative Container For An Entity Component System
The intro to this problem is a bit of a long one so my apologies in advance. In short I am asking for suggestion as to what type of collection I should use to store data for a particular part of my ...
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1answer
816 views
Are references between entities in Entitiy Component System allowed?
I've got a player entiy in my game that can pick up weapons when colliding with item entities. The player can hold and use the weapon in their hand (the weapon sprite is rendered relative to the ...
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2answers
221 views
How to handle component-based objects in a game loop?
I've been writing my own game engine and I was wondering the correct way to handle my game objects. Each game object is different. The only thing they have in common is a set of operations to handle ...
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2answers
6k views
How do components access one another in a component based entity system
---Most of the stuff I am talking about I read here---
I am currently tring to wrap my head around component based systems to make a simple game engine of sorts.
I am having a hard time ...
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2answers
1k views
Should a system be able to render things? (ECS)
I'm currently building an entity component system and I just have one question... Should a system be allowed to render things to the screen?
For example, should I make a SpriteComponent that contains ...
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3answers
953 views
Binding c++ templated functions to lua
I have started using Lua as a scripting language for my game engine. It works perfectly for things like input, audio etc. However, I'm now trying to bind my entity component system functions which ...
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2answers
2k views
Where is 'game logic' implemented in component based design?
I have been trying to get my head around using an entity component system for a game. But I am struggling to understand how I should do 'game-logic'.
What I have so far:
Components are essentially ...
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1answer
74 views
Guidelines for determining what should be a component?
Background:
So I'm developing my first 2d C++ fighting game (for learning purposes) and I have a setup where I have 'components' which are really just data holders with maybe some simple utility ...
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1answer
42 views
How to determine the values of parameters controlling the game objects? [closed]
I am a C# developer and now trying to change to my dream field: Game Development.
I am new to Game Development and currently self learning Unity3D.
To me Unity is component based tools and we can ...
4
votes
2answers
462 views
Where to store contiguous arrays of components?
I've been working on an entity component system and have the trouble of where to define/put the arrays of each component type. Each component type is user defined so I do not know what or how many ...
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0answers
151 views
Communication in an entity-component through public variables or public member functions [closed]
I am currently coding my own ECS to get a deeper understanding of how such an engine works. I am currently putting together systems. I am aware that there is no right answer to my question as there ...
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1answer
5k views
What is a faster alternative to a GetComponent from a RaycastHit?
I have a basic AI car script which needs to interact with other cars around it. I would like to access variables from the other cars to help one car identify what the other cars are doing so they can ...
2
votes
1answer
671 views
Component based architecture in TypeScript
I'm doing a game using Phaser with TypeScript. I want to implement a component based architecture for Actors.
What I'm trying to achieve is this:
...
2
votes
1answer
1k views
ECS - Components inside components?
Reading up on ECS, I've tried to implement a simple 'game', if you can call it that.
Basic concepts :
You have planets(entity), they produce gold. (gold is a component inside planet)
Planets can ...
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1answer
55 views
Changing the current state of an entity in the middle of an update step or wait for the end?
Let's say that I use a behaviour component that holds a function call to be called every update step assigned to an entity. Inside that function call I'm changing the active state for the entity to ...
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0answers
111 views
Change entity's size based on health [ECS]
I'm making a kind of entity component system framework and I have a doubt:
I have two components 'health_damage', 'physic' (which contains position, weight,...) and 'sprite' (position, dimensions...)....
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1answer
5k views
A more data oriented design approach to Entity Component System game engine
I'm creating my first c++ game engine project (for learning purposes) and in it I've attempted to implement an entity/component system utilizing some data oriented design principles while also not ...
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2answers
103 views
How to solve this component based events response issue?
I'm working on a new game architecture and I have issues with the handling of events in our component-based approach.
We have a component Match. When a match ends, an event Match_end is sent. There ...
6
votes
2answers
4k views
Entity-Component-System data storage design
I'm working on an ECS and I've already read a lot of articles about it. Most of these articles are talking about a simple case (store data contiguously, read it in a single for loop). However the real ...
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votes
2answers
2k views
Component oriented programming for rich RPG world
I've asked this question on several forums but didn't get the proper answer yet.
So, in my opinion, it is a really theoritical and deep, but I really can't deal with it by myself.
What is my goal?
I ...
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1answer
1k views
Data-oriented design and Component Sytem cross-referencing
Let's assume we're talking about a game (engine) which is written in C++. This is more like a design question but I can't find any suitable description.
Component System
The Component System says ...
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1answer
156 views
Communication between the SubSystems and the GameObject components?
Currently I have an architecture (not 100% accurate):
The RenderData contains primitives, which will be processed by the GraphicsEngine.
Upon creation I have to send the pointer of the renderData ...
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2answers
109 views
Unused methods after component inheritance in component based architecture?
I have a GameObject class, which contains Components, like:
Renderer
Camera
Behaviour
Rigidbody
First I inherited all of them from Component which has an Update() method, and it is called every ...