Topic: Optimisation research

[EloiStree]

Ok plan to make a recap on the performance you need to keep in mind for your game for artist mainly and a bit for developer.

So... Here is a post about what i found on the web on the subject.

[EloiStree]

How to improve game perfromance | Unity 2019

CPU

Update game state

• C# Script optimiation
• Pooling
• Compress texture
  • MipMaps

    GPU

    Manage graphics computation

• Batching and static
• Dynamic Batching
• Shadow / Reflexion / Light
  • Pixel per light
  • Reflexion prog
• Baking light map
• Shader optimiation

Both GPU & CPU

• Occlusion culling
• Level Of Details LOD
• GPU Instancing

Out of Unity

• Model triangle
• Baking light map

  Profiler

• https://youtu.be/pezeF6Vv5rI?t=145

[EloiStree]

Remind me of tips I used

• GPU Instancing from Blender for ship
• Compute Shader for Kinect Juggling sphere
• Compute Shader for ship trajectories

[EloiStree]

Reminder: ms milliseconds

60 fps = 60 frame/seconds 120 fps = 8.3 ms 70 fps = 14.3 ms 60 fps =16 ms 55 fps = 18 ms 45 fps =22.2 ms

[EloiStree]

Can we use Post-Processing in VR ?

Pro

• Would be cool
• Good lighting
• Why would we want a ugly game when we want virtual immersion ?

  Against

• It kills your GPU
  • Because of double camera, it double kills GPU
    • Because you like light, shadow & transparent, it triple kills the GPU
• When in 2018 Gear VR + Cardbaord game was at 1 000 000 devices, the VR on computer industry was about 250 000 if I remember well. And now, Oculus is back with the Oculus Quest. AR start to be back for the years in coming 2021-2023. XR happens mainly on device with low graphic card without ventilation and no overclocking power.
• Any cost in on the CPU & the GPU is a cost in electricity. And every cost on electricity lead to more heat to deal with and less batteries for the player.
• VR Sickness have high chance to be present on game under 60-70 FPS. Do you want to sacrifice 1-8 ms of your 14 ms available for good shaders ?

  The question you need to ask yourself...

  You don't need good tools to draw good art. You need good artists that can use the constraint of the tools and the environment he owns. So is Post-processing is essential to your game ?

• Yes, then use it. But know the costs.
• No, then try to avoid them. Be creative on the style of your game.

[EloiStree]

GPU & CPU ? What the difference ?

CPU will do one task at a time on what we call a thread. GPU will do the a computable task to a large prepared group of data in the graphic card.

• FR previous workshop

What a Shader ?

The basic

Eyes Porn Shader

Compute shader

[EloiStree]

Previous Unity workshop on the subject Link

AAA for VR

[Full list of the photo here](https://docs.google.com/spreadsheets/d/1TI-X7T4Dh67LKkINNmpfvuofxn3RCUhHVNInaRRUsw/edit?usp=sharing)_

Gear VR Performance

When I was working with Gear VR, I had a project to check the boundary of it. The Galaxy Note 4 had in Unity 5 a bit bottle neck at 200 drawcall that I don't always find in following phone

Topic	Limit	State of phone
Drawcall	<100	You are good but remeber that you have two camera so 50 max
Drawcall	>100	The Gear VR start to have performance issue
Drawcall	>160	You are definitely not in the > 60 FPS anymore
Trianble	<50.000	You are good to go
Trianble	<100.000	You start to play with fire
Trianble	>100.000	Depending of your project you start to have problem
Trianble	>250.000	You won't have your 60 FPS anymore

Max triangle 65.000

In unity object can only make 65.000 triangles max object. Meaning that you will have for a house of 200.000 triangles.

• Four drawcalls
  • Eight if you are in VR
    • 16 if you use two materials on the object
    • can have 32 if you use real-time lighting / shadow on it
      • ...

[EloiStree]

Unity Profiler

Manuel

Demo of how to read information:

• Deep Profiling
• In game demo

Full conference on the subject:

Wi-Fi Unity Profiler

You can profile in development build if you check it/

• Gear VR post using ADB directly

[EloiStree]

C# Optimisation with Unity

Unity Tips & Trick blog about it

• https://docs.unity3d.com/Manual/MobileOptimizationPracticalGuide.html
• https://docs.unity3d.com/Manual/MobileOptimizationPracticalScriptingOptimizations.html
• https://docs.unity3d.com/Manual/OptimizingGraphicsPerformance.html

[EloiStree]

Unity Conference on Optimisation

2016

For Mobile

• Find out what is slow, compare, analyze

Content (Advance/Prog)

](https://youtu.be/n-oZa4Fb12U?t=94)

• Profile before in optimisation but... Plan the content limitation at start
  • Conf index
  • Serialized
    • Be careful, Serialization is saving "EVERY THING"
    • Conclusion
    • PS: Profile in editor or platform are not the same at all
    • UI Prefabs
    • Use SriptableObject instead of Serialized

2017

for Beginner

• There are not solution working for every project
• Know what wrong before fixing
• Profile your game
• GPU vs CPU Bound
• Run code faster
  • Check the code cost (Ex: Find is cost heavy)
  • Don't call code every update call
• Garbage collection
  • Stack & Heap
  • Stack = variable reuse automatically or still ref
  • Heap variable that are ref then abandon to be collected by the garbage
• Profile on the worst device you want to support !
• Don't optimized, for optimizing, if you don't have the problem or won't have it soon.

High Performance C# Script with Job System (Advance / Prog)

Glossary

• Call render pixed to the screen is call a frame
• Frame rate = how many frames by time
• Speed is not the most important, consistency is !
• Bottleneck (GPU or CPU Bound)

[EloiStree]

Tmp List: to watch when I have time

• https://youtu.be/-01SoWFkxcE

[EloiStree]

Decimation

• On Blender
• On Meshlab

[EloiStree]

Vertex Color

Youtube Search: Vertex Coloring

You can use Vertex Colored asset to optimized some part of your game

• Explication
• Forum
• Blog
• Tutroial

Occlusion Culling

https://youtu.be/OmuQmydipGg

LOD: Level of detail

https://youtu.be/ifNyVS2_6f8

[EloiStree]

Mesh Baking & Atlas

Mesh Baking

Using Mesh Baker

Using Mesh Baker in Unity

• Full tutorial
• Documentation Pay version - Free version

  Do it by script yourself

  

Atlas

Sprite example:	Atlas	Atlas

In Blender

The tutorial: https://www.creativeshrimp.com/game-level-texturing-texture-atlas-part-35.html

[EloiStree]

Blogs found

Old but gold

• Tips & Trick for Gear VR Optimization
• VR Best Practice
  • Minimize (or eliminate) the use of post-process effects
  • Keep geometry as simple as possible
  • Minimize draw calls
  • Avoid using Standard Shader or other computation-heavy shaders
  • Use Physics wisely as it is very computation-heavy. If possible, replace Physics colliders with distance-checking logic.
  • Thermal Throttling: heat lead to hardware performance lowering
  • Render Scale: Change the resolution per eyes
  • Some Shaders are not design for VR
  • Standard shader are usually not design for mobile and performance in mind.
  • Use the Anti-aliasing given by the SDK of the headset builder if possible else MSAA
  • Check the Lighting Strategy Guide
• Lighting Strategy Full guide of how to use light to have beautiful scene (not optimized)
• Drawcall batching tutorial

Code

• Guide on memory management & optimization

[EloiStree]

Play with Quality Parameters

Video about the Quality Settings

[EloiStree]

Tips & Trick

2D Mobile

• Target Framerate
• Play with Quality Setting
• Avoid GetComponent() by using reference variable
• Remove raycast on UI
• Set your audio to Compressed in Memory with low quality level
• Allow Multithread rendering
• Enable/Disable not used object in the sceen
• Use texture pacakge (an Atlaser)
• Use profiler
• Use TextMesh Pro instead of default UI

[EloiStree]

Indian accent

You know ^^... Those video you don't want to hear but they rocked the subject.

Optimisatoin (Complete course, 48 min)

[EloiStree]

GPU Instancing

One Mesh Pool (My old alternative , time consuming)

Sketchab - Unity Code Demo

1. Create a Blender with all the objects in row.
2. Link bones to each objects
3. Export in Unity
4. Use a pooling system to access the bone representation to move.
5. Create script to access them and move them with the empty object linked to them

Pro:

• Reduce to one drawcall by 65.000 Vertex
• Performance don't vary anymore

Against:

• You can't cull them
• You lose some performance on the pool management.

Pro:

• A game with 5.000 asteroids moving with 1000 bullets at the same time was running on a Gear VR with 60+ FPS when I tried this strategy for the first time.

[EloiStree]

Only video on the Quest

Unity 2018 Conf

• use ASTC Texture compression
  • From 21.3MB to 1.3MB

Must watch video 😁

https://youtu.be/w0n4fuC4fNU

1. Don't make realistic game
2. Don't use post-processing
3. Adjust Project setting
4. Turn GPU instancing on materials
5. Combine your meshs (easy combine & Mesh Gamer)
6. Use Google Seurat
7. Amplify Impostors
8. Use Static lighting & Baking
9. Occlusion Culling
10. Remove Detail When needed
11. Use More Effective Coroutine More

Did not watch yet

• https://youtu.be/G0GHkQ9v4I4?t=253
• https://youtu.be/JvMQUz0g_Tk

[EloiStree]

Top 10 Modeling tip for VR

https://www.youtube.com/watch?v=Djx5WltmTUU

1. Build to scale
2. Think like a designer
3. Pixels over Polygons (Reduce Poly Count) Exception transparency
4. Sharing data is caring
5. Use Event texel density
6. Careful with normal maps
7. Don't count on reflection
8. Cut it out with the cutouts (Transparent)
9. Bake Everything
10. Use LOD Recap

[EloiStree]

Baking Light

(Missing post about it, don't like light ;) )