Presentation made at Unreal Fest 2018 Europe. For any questions, message Joakim.Ohlander@yager.de

1. OPTIMIZATION GEMS FROM YAGER
BY: JOAKIM OHLANDER

2. INTRODUCTION
• Joakim Ohlander – Senior Game Engineer @ YAGER
• 4.5 Years

3. INTRODUCTION
• YAGER - UE4 6 Years UE3 7 Years
• Reliability over performance
• Network relevancy

4. INTRODUCTION
Joe
Sam

5. INTRODUCTION
Sam
Joe

6. INTRODUCTION
Joe
Sam

7. INTRODUCTION
Joe
Sam

8. INTRODUCTION
Joe
Sam

9. INTRODUCTION
Joe
Sam

10. INTRODUCTION
Joe
Sam

11. INTRODUCTION
• YAGER - UE4 6 Years UE3 7 Years
• Reliability over performance
• Network relevancy
• UE4 is made for all games
• You have to optimize for your game
• Optimization gems from YAGER

12. • Gems:
• Perfomance tracker
• Multiple animated components into one
• Network Pooling
INTRODUCTION

13. #1 PERFORMANCE TRACKER
SPECIAL THANKS: OLIVER NEUMANN, OLIVER STUBENRAUCH & FLORIAN ZENDER

14. PERFORMANCE TRACKER
• Framerate should run at a constant speed
• Not everything is equal
• Profile and optimize these systems
• Staff / Money resource intensive
• Reactive to frame rate changes
• State definitions
• Define tuning for these different states
VERY BAD
BAD
OK
GOOD
VERY GOOD

15. PERFORMANCE TRACKER
• Calculate state:
• Avg frame rate(90 frames)
• Hitches
• Future prediction 90 + N
VERY BAD
BAD
OK
GOOD
VERY GOOD

16. PERFORMANCE TRACKER
• Calculate state:
• Avg frame rate(90 frames)
• Hitches
• Future prediction 90 + N
• Inform subsystems and make them react
• Particles

17. PERFORMANCE TRACKER
• Calculate avg frame rate
• Define state of game
• Hitches
• Future prediction 90 + N
• Inform subsystems and make them react
• Projectiles & Particles

18. PERFORMANCE TRACKER
• Calculate avg frame rate
• Define state of game
• Hitches
• Future prediction 90 + N
• Inform subsystems and make them react
• Particles
• Significance
Low
Medium
High
Critical

19. PERFORMANCE TRACKER
• Calculate avg frame rate
• Define state of game
• Hitches
• Future prediction 90 + N
• Inform subsystems and make them react
• Particles
• Significance
• Game specific optimizations
• Lerp tuning variables

20. PERFORMANCE TRACKER
OPTIMIZE FOR YOUR GAME

21. PERFORMANCE TRACKER - SUMMARY
• Framerate should run at a constant speed
• Not everything is equal
• Performance tracker that tracks 90+N frames
• Subsystems react to this data and changes their behavior

22. #2 MULTIPLE ANIMATED OBJECTS INTO
ONE

24. MULTIPLE ANIMATED OBJECTS INTO ONE

25. MULTIPLE ANIMATED OBJECTS INTO ONE
21

26. MULTIPLE ANIMATED OBJECTS INTO ONE

27. MULTIPLE ANIMATED OBJECTS INTO ONE
12

28. MULTIPLE ANIMATED OBJECTS INTO ONE
Max draw distance
Tune component Variables
Platform optimizations

29. MULTIPLE ANIMATED OBJECTS INTO ONE
-1.5 19.5 10.5

30. MULTIPLE ANIMATED OBJECTS INTO ONE
• Problem:
• Component count
• Complexity

31. MULTIPLE ANIMATED OBJECTS INTO ONE
• Problem:
• Component count
• Complexity
• Skeletal mesh merge
• N Skeletal meshes TO 1
• All unique bones merged
• Generates rendering data
• Outputs one skeletal mesh

32. MULTIPLE ANIMATED OBJECTS INTO ONE
• Does not work for our case:
• Unique animated meshes
• Runtime decided

33. MULTIPLE ANIMATED OBJECTS INTO ONE
• Modify Skeletal mesh merge
• Duplicate all bones
• Link together to root node
• Create the rendering data
• Output one skeletal mesh

34. MULTIPLE ANIMATED OBJECTS INTO ONE

35. MULTIPLE ANIMATED OBJECTS INTO ONE
• Modify Skeletal mesh merge
• Duplicate all bones
• Link together to root node
• Create the rendering data
• Output one skeletal mesh

36. MULTIPLE ANIMATED OBJECTS INTO ONE

37. MULTIPLE ANIMATED OBJECTS INTO ONE
• Epic animation update
• Component
• Animation instance
• Animation Proxy
• Animation Update object
• RecalcRequiredBones
• Evaluate Animation
• Component space calculation

38. MULTIPLE ANIMATED OBJECTS INTO ONE
• RecalcRequiredBones
• LOD Generation

39. MULTIPLE ANIMATED OBJECTS INTO ONE
• Evaluate Animation
• Animation Graph
• Native Evaluate

40. MULTIPLE ANIMATED OBJECTS INTO ONE

41. MULTIPLE ANIMATED OBJECTS INTO ONE

42. MULTIPLE ANIMATED OBJECTS INTO ONE
• Evaluate Animation
• Animation Graph
• Copy paste nodes
• Data -> Datatable

43. MULTIPLE ANIMATED OBJECTS INTO ONE
• Component space calculation
• Attached socket location
• Masked index to ComponentToWorld

44. MULTIPLE ANIMATED OBJECTS INTO ONE
• Problem:
• Component count

45. MULTIPLE ANIMATED OBJECTS INTO ONE
• Problem:
• Component count
• Skeletal mesh merge solution
• Animation update object

46. MULTIPLE ANIMATED OBJECTS INTO ONE
-10

47. MULTIPLE ANIMATED OBJECTS INTO ONE
21 -1.5 -10 9.5

48. MULTIPLE ANIMATED OBJECTS INTO ONE
OPTIMIZE FOR YOUR GAME

49. #3 NETWORK POOLING
SPECIAL THANKS: ISAAC ASHDOWN & OLIVER STUBENRAUCH

51. NETWORK POOLING
• Similar objects created multiple times
• Can be very expensive (2-4ms) per Object
• Network creation
2-4 MS

52. NETWORK POOLING
Joe
Sam

53. NETWORK POOLING
• Similar objects created multiple times
• Can be very expensive (2-4ms) per Object
• Network creation
2-4 MS

54. NETWORK POOLING
• Similar objects created multiple times
• Can be very expensive (2-4ms) per Object
• Network creation
• Solution: Pooling
• Component & Actor Pool Manager
• Internal ID referencing
• Add to GC ignore list(Root set)
• SpawnActor/ NewObject

55. NETWORK POOLING
• Initialize / Deregistration
• Base actor -> Owned Components
• Destroy
• Pooling states
InPool
Active
ReturnToPoolObjectProperty
GC

56. NETWORK POOLING
• Initialize / Deregistration
• Base actor -> Owned Components
• Destroy
• Pooling states
• Network pooling
• bAlwaysRelevant – Remove from network relevancy loop when in pool
• Pooling state management
• Replication order
• Pre Pool vs Lazy pool
• Memory & Loading times

57. POOLING - SUMMARY
• Expensive objects that get created over and over
• Pooling to reuse it
• Techniques what we do to implement it.
• Internal ID referencing
• RootSet
• Initialize/Deinitialize
• Reference Nulling
• Network management
• Pool the objects you need

58. SUMMARY
• Perfomance tracker
• Multiple animated objects into one component
• Network pooling
• Use UDN & Answerhub
• Optimization gems from YAGER

59. SUMMARY
OPTIMIZE FOR YOUR GAME

60. QUESTIONS?