Learn how to use the Lightweight Render Pipeline to optimize for maximum performance on mobile platforms. After watching this, you will be ready to build an experience for standalone mobile VR headsets, like Oculus Go, and how to use 3-DOF controllers for interactions. Speakers: Dan Miller (Unity Technologies)

1. Mobile VR
Dan Miller
XR Evangelist

2. The current ecosystem
- New requirements, more portability
Getting started in Unity
- Lightweight Render pipeline on Mobile
- PPv2
Controller Integration and Input
Controller interaction and examples
Future considerations & Extra Tips
Overview

3. Mobile VR
Current ecosystem

4. Mobile VR
New players
72 Hz
75 Hz
60 Hz
60 Hz
Run for 30 mins
Run for 45 mins

5. Getting started with LWRP for VR
2018.1 template via the Hub
Transform Hierarchy for generic VR
- Top level transform for moving
- Both hands setup
Things to note
- Post processing v2 is current disabled in LW RP (patch in flight)
- Hand transforms (Tracked Pose Driver) have no visual representation
- MSAA must be disabled in order to render properly

6. LWRP VR - Performance Benchmarks
Benchmarks against Built In renderer (legacy)
Nightmare scene
Built in LWRP LWRP + OVR
46 FPS 60FPS 72 FPS
Benefits
- Performance!
- Has a new batcher that reduces setup cost for each draw call
- Shades light in single pass decreasing the overdraw and amount of drawcalls
- Only performs a depth prepass when using Cascade shadows

7. LWRP Things to consider
Benefits
- Shader graph compatibility
- Rendering is open source, add or modify it to your will!
- Future proof
Limitations
- Post processing v2 is current disabled in LW RP (patch in flight)
- Limited number of lights, 4 point lights, 1 direction
- Only one shadow casting light (directional)
- No MSAA (currently)
- Old assets built in legacy render are ‘broken’

8. Post Processing Stack v2
Most up to date version on github https://github.com/Unity-Technologies/PostProcessing
Also available, on the asset store and via Package Manager ( 2018.1+ )
Current Support
Legacy Renderer:
- Multi-pass OK
- Single-pass OK
- Single-pass Instanced currently unsupported
LWRP:
- Currently unsupported (patch in flight)
HDRP:
- Does not support VR

9. Post Processing Stack v2
Works in VR
- Color Correction
- Bloom
- Vignette
- Auto Exposure
- Ambient occlusion
- Chromatic Aberration
Works in VR but Maybe not a great idea
- Depth of Field
- Grain
Doesn’t work
- Motion blur
- Screen space reflections

10. Controllers
Oculus Daydream

11. Controllers
Oculus Daydream

12. Unity Integration

13. Unity Integration

14. Unity Integration - Gear VR, Oculus Go

15. Oculus Utilities
● Gear VR and Oculus Go Controller Model
● OVR Lint Tool
● Controller Prefab and Camera Rig
● Example Scenes
● Editor Camera Emulation

16. Unity Integration - Google VR
https://github.com/googlevr/gvr-unity-sdk/releases

17. Google VR SDK
● Daydream Controller Model
● Example scenes
○ Keyboard
○ UI scrolling
○ Video
● Mobile optimized VR Shaders
● Laser Pointer
● Spatialized Audio System

18. Controller Input

19. OVR Input
● Wraps Unity’s built in input system
● Query Buttons with
○ Get()
○ GetDown()
○ GetUp()
● Built in swiping gesture utilities for touchpad
○ Up, Down, Left, Right
● Be weary of custom input axis and the positive escape button

20. OVR Input mappings
OVRInput.Button.Back
OVRInput.Button.PrimaryTouchpad
OVRInput.Touch.PrimaryTouchpad
OVRInput.Axis2D.PrimaryTouchpad
Swipes
OVRInput.Button.DpadLeft
OVRInput.Button.DpadRight
OVRInput.Button.DpadUp
OVRInput.Button.DpadDown
OVRInput.Button.PrimaryIndexTrigger

21. Google VR Input - Daydream
Static reference to GvrControllerInput class
● Query Button states from static bools
○ GvrControllerInput.AppButton
○ GvrControllerInput.AppButtonDown
○ GvrControllerInput.AppButtonUp
● Can query Gyroscope and Accelerometer
○ GvrControllerInput.Accel
○ GvrControllerInput.Gyro

22. GVR Input mappings - Daydream
GvrControllerInput.AppButton
GvrControllerInput.IsTouching
GvrControllerInput.TouchDown
GvrControllerInput.TouchPos
GvrControllerInput.HomeButtonDownG
vrControllerInput.Recentered

23. Multiplatform
○ Touchpad values are NOT the same (OVR has swipes)
Daydream Gear VR

24. Controller Interactions

25. Mobile Controllers are 3-DOF

26. Keyturn Interaction

27. Keyturn Interaction

28. Keyturn Interaction
MAX_ROT = 115

29. Catching bugs
○ Unitychan spring bone 2.0
○ https://github.com/unity3d-jp/UnityChanSpringBone

30. Tuning Settings for Mobile
https://developer.oculus.com/blog/tech-note-unity-settings-for-mobile-vr/
Texture Compression
Players settings
Audio

31. Daydream Elements
Checkout Daydream Elements
https://github.com/googlevr/daydream-elements

32. Google Instant preview
Debug, run and test your application in editor
HMD rotation Driven from mobile device

33. Adjust Default Camera
Change near clip plane of Camera from 0.3 to 0.1 if using GearVRRig change
CenterEyeAnchor

34. VR is about Performance
ECS is performance by default
Take advantage of the hardware
you’re running on!
Perfect fit for VR

35. Thank you!
Dan Miller
XR Evangelist
DanielMi@unity3d.com
@DanMillerDev