https://github.com/colinleung-nilocat/unityurp-mobiledrawmeshinstancedindirectexample

Example project to draw 1million grass instances on mobile
https://github.com/colinleung-nilocat/unityurp-mobiledrawmeshinstancedindirectexample

grass indirect instancing mobile unity urp

Last synced: 3 days ago
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Example project to draw 1million grass instances on mobile

• Host: GitHub
• URL: https://github.com/colinleung-nilocat/unityurp-mobiledrawmeshinstancedindirectexample
• Owner: ColinLeung-NiloCat
• License: mit
• Created: 2020-07-24T20:22:13.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2020-11-25T15:47:14.000Z (almost 4 years ago)
• Last Synced: 2024-10-30T01:44:25.988Z (17 days ago)
• Topics: grass, indirect, instancing, mobile, unity, urp
• Language: C#
• Homepage: https://youtu.be/A7rav4tS88s
• Size: 3.06 MB
• Stars: 1,553
• Watchers: 30
• Forks: 236
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

        
# UnityURP-MobileDrawMeshInstancedIndirectExample

youtube runtime demo video: https://youtu.be/A7rav4tS88s  

download .apk, try it on your android phone: https://drive.google.com/file/d/185JWZXYPnVyDnA451cEZkS2H2wOYSce_/view

 DrawMeshInstancedIndirect ON

 ![screenshot](https://i.imgur.com/oQoFK46.png)

 DrawMeshInstancedIndirect ON (grass bending)

 ![screenshot](https://i.imgur.com/QDXbEZw.png)

 ![screenshot](https://i.imgur.com/E7wEEPR.png)

 DrawMeshInstancedIndirect OFF

 ![screenshot](https://i.imgur.com/xOhTW6d.png)

 

 Why create this repository?

 -------------

 To demonstrate an API that can draw millions of instance -> DrawMeshInstancedIndirect(), running on mobile devices.

 

 Can this demo runs on midrange mobile?

---------------

- can handle 10 million instances on Samsung Galaxy A70 (GPU = adreno612, not a strong GPU), 50~60fps, performance mainly affected by visible grass count on screen(draw distance = 125)

- can handle 10 million instances on Lenovo S5 (GPU = adreno506, a weak GPU), 30fps, performance mainly affected by visible grass count on screen(draw distance = 75)

 

 Requirement

 -----------------

 if you want to try the pre-built .apk, your android device must support Opengles3.2 / Vulkan  

 download .apk: https://drive.google.com/file/d/185JWZXYPnVyDnA451cEZkS2H2wOYSce_/view

 

 Where are the important files

 ----------------

 https://github.com/ColinLeung-NiloCat/UnityURP-MobileDrawMeshInstancedIndirectExample/tree/master/Assets/URPMobileGrassInstancedIndirectDemo/InstancedIndirectGrass/Core

 

 Editor

 ------------

 2019.4.15f1

 

 Note

 -------------

 This is a simplified example repository to demonstrate DrawMeshInstancedIndirect API on mobile platform.  

 This repository is as simple as possible, only contains a simple CPU cell frustum culling(not even a quadtree) -> minimum compute GPU frustum culling (no Acceleration Algorithms), then just 1 DrawMeshInstancedIndirect call, nothing else, code is very short.

 

 Lighting and animation is not the main focus of this project, but ~40% of the time was spent on writing grass shader's lighting & animation, you can have a look at  InstancedIndirectGrass.shader if you are interested.  

 

 This repository also contains a RendererFeature(GrassBendingRTPrePass.cs) to render an offscreen RT(R8), which renders top down view grass bending area (by trail renderer following moving objects), it is a very simple method but the result is good enough for this demo.

 

reference

-------------------

- https://github.com/ellioman/Indirect-Rendering-With-Compute-Shaders

- https://github.com/tiiago11/Unity-InstancedIndirectExamples

- https://assetstore.unity.com/packages/tools/utilities/gpu-instancer-117566

- https://assetstore.unity.com/packages/tools/terrain/advanced-terrain-grass-100014