https://github.com/paullj/unity-ecs-instanced-sprite-renderer

An example of a simple performant sprite renderer using Unity's new ECS system
https://github.com/paullj/unity-ecs-instanced-sprite-renderer

Last synced: 2 months ago
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An example of a simple performant sprite renderer using Unity's new ECS system

• Host: GitHub
• URL: https://github.com/paullj/unity-ecs-instanced-sprite-renderer
• Owner: paullj
• License: mit
• Created: 2018-04-05T20:31:32.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2019-06-21T17:22:54.000Z (over 5 years ago)
• Last Synced: 2024-10-23T05:32:22.104Z (3 months ago)
• Language: C#
• Homepage:
• Size: 57.6 KB
• Stars: 138
• Watchers: 16
• Forks: 22
• Open Issues: 7
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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• awesome-unity-open-source-on-github - Instanced Sprite Renderer for Unity's ECS - An example of a simple performant sprite renderer (ECS)

README

        
# Instanced Sprite Renderer for Unity's ECS

This project is a simple example of how Unity's new Entity Component System (ECS) in 2018.1.14f1 can be used to create a performant instanced sprite renderer. Find out about the [new ECS in Unity here](https://github.com/Unity-Technologies/EntityComponentSystemSamples).

The assets used in the example are from [Kenney's Animal Pack](https://kenney.nl/).

Thanks to [@Shinao](https://www.reddit.com/user/Shinao) for the help. 

## Quick Start

1. Make sure you have [this version of Unity 2018.1.0b12](https://beta.unity3d.com/download/ed1bf90b40e6/public_download.html) installed

2. Make sure the manifest.json file located at `.../[PROJECT FOLDER]/Packages/manifest.json` looks like this:

```

{

  "dependencies": {

      "com.unity.entities": "0.0.12-preview.19",

      "com.unity.package-manager-ui": "1.9.11",

      "com.unity.modules.ui": "1.0.0"

    },

    "testables": [

      "com.unity.collections",

      "com.unity.entities",

      "com.unity.jobs"

    ],

}

```

3. Download [this .unitypackage file](https://github.com/toinfiniityandbeyond/ecs-instanced-sprite-renderer/releases/download/0.2/ECS.Instanced.Sprite.Renderer.unitypackage) and import it.

4. Open **SpriteRendererScene** and press play.

## How it Works

By adding `SpriteInstanceRenderer` to an entity it is rendered using its `Position` and `Rotation` as a quad with a texture on it.  The `SpriteInstanceRender` inherits `ISharedComponentData` meaning any entity using same instance of will be drawn in one draw call. This is possible because of [Graphics.DrawMeshInstanced](https://docs.unity3d.com/ScriptReference/Graphics.DrawMeshInstanced.html) method. In the Example Scene included, 10,000 sprites are drawn. However the before mentioned method only draws a maximum of 1023 instances at once, so it splits up into as many groups necessary to draw all the instances.

## Limitations

* No way to push the matrices from a job

* No NativeArray API, currently uses `Matrix4x4[]`

As a result this code is not yet jobified. For now, we have to copy our data into Matrix4x4[] with a specific upper limit of how many instances we can render in one batch.