Wreaking Havok: an overview of Havok Physics in Unity – Unite Copenhagen 2019
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This session will provide an overview of the Havok Physics integration and workflows in Unity. Gain insight into how we've integrated the industry-leading Havok Physics system into Unity using our Data-Oriented Technology Stack (DOTS). These slides will cover the shared data layout of our physics engines, the performance and fidelity benefits of Havok Physics, and future development plans, as well as showcasing several examples from the Unity community that leverage these systems. Speaker: Steve Ewart - Havok
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Wreaking Havok: an overview of Havok Physics in Unity – Unite Copenhagen 2019
- 2. Wreaking An overview of Havok Physics in Unity Steve Ewart Adam Mechtley
- 3. — Havok + Unity Partnership — Unity Physics - Systems — Havok Physics - Simulation Differences — Roadmap Ideas
- 4. Havok + Unity Partnership 4
- 5. Havok Powered Titles — Over 700 shipped titles — Across many platforms including Xbox One, PS4, Stadia, iOS, Android and more
- 7. Havok + Unity Partnership 7
- 8. See Adam Mechtley’s Unite 2019 talk ‘Get Moving: an overview of physics in DOTS’ Unity Physics 8
- 9. DOTS Physics – ECS Overview 9 Authoring Data GameObject Conversion Entity Data Build Physics World Physics Data Back- end? Simulate/Step Unity Physics Simulate/Step Havok Physics Export Physics World
- 10. DOTS Physics - Data 10 Simulation Data In — Collision Info — Collider — Transform — Dynamics Info at t(0) — Velocity — Center of Mass — Inertia Orientation Simulation Data Out — Dynamics Info at t(1) — Velocity — Center of Mass — Inertia Orientation — Events — Collisions — Triggers Back- end? Simulate/Step Unity Physics Simulate/Step Havok Physics
- 11. DOTS Physics – StepPhysicsWorld 11
- 12. Unity Physics – Simulation Pipeline – Overlaps 12 — Expanded AABB — Linear Velocity — Angular Velocity — Find and Sort Overlapping Pairs — Dynamic vs Dynamic — Static vs Dynamic — SimulationCallbacks.Phase .PostCreateDispatchPairs
- 13. Unity Physics – Simulation Pipeline – Narrowphase 13 — Process Body Pairs — Create Contact Points — Build Joint Jacobians — SimulationCallbacks.Phase .PostCreateContacts
- 14. Unity Physics – Simulation Pipeline – Solve 14 — Build Contact Jacobians — Friction — Trigger — SimulationCallbacks.Phase. PostCreateContactJacobians — For #Steps — Solve Jacobians — Static Contacts Last
- 15. Unity Physics – First – RoboCraftX 15 — https://store.steampowered.com/app/1078000/RobocraftX/ https://www.reddit.com/r/RobocraftExperiments/
- 16. Unity Physics - Systems 16 — BuildPhysicsWorld — StepPhysicsWorld — public interface ISimulation : IDisposable — DummySimulation // No Physics — Simulation // default Unity Physics — HavokSimulation // Havok Physics — ExportPhysicsWorld
- 17. Havok Physics 17
- 18. Havok Physics 18
- 19. Havok Physics 19
- 20. Simulation Differences 20 — Behaviour – Penetration Recovery – Stacking – Restitution – Speculative Contacts — Performance – Deactivation – CPU Usage
- 21. Simulation Differences 22 — Behaviour – Penetration Recovery – Stacking – Restitution – Speculative Contacts — Performance – Deactivation – CPU Usage
- 22. 23 Simulation Differences – Unity Physics — Behaviour – Penetration Recovery – Stacking – Restitution – Speculative Contacts — Performance – Deactivation – CPU Usage
- 23. Simulation Differences – Havok Physics 24 — Behaviour – Penetration Recovery – Stacking – Restitution – Speculative Contacts — Performance – Deactivation – CPU Usage
- 24. 25 Unity Physics Havok Physics
- 25. Simulation Differences 26 — Behaviour – Penetration Recovery – Stacking – Restitution – Speculative Contacts — Performance – Deactivation – CPU Usage
- 26. 27 Unity Physics Havok Physics
- 27. Havok Physics – First! 28 — @Nothke
- 28. Simulation Differences 29 — Behaviour – Penetration Recovery – Stacking – Restitution – Speculative Contacts — Performance – Deactivation – CPU Usage
- 29. Simulation Differences – Unity Physics 30 — Behaviour – Penetration Recovery – Stacking – Restitution – Speculative Contacts — Performance – Deactivation – CPU Usage
- 30. Simulation Differences – Havok Physics 31 — Behaviour – Penetration Recovery – Stacking – Restitution – Speculative Contacts — Performance – Deactivation – CPU Usage
- 31. 32 Unity Physics Havok Physics
- 32. Simulation Differences 33 — Behaviour – Penetration Recovery – Stacking – Restitution – Speculative Contacts — Performance – Deactivation – CPU Usage
- 33. Speculative Contacts – Against Mesh Triangles 34
- 34. Speculative Contacts 35 — Zero friction on block — Highly tessellated terrain mesh — Ghost collisions with edges of upcoming mesh faces
- 35. 36 Speculative Contacts – Rotate Contact Normals
- 36. Speculative Contacts – Unity Physics 37 — ModifyNarrowphaseContacts sample — Rotates & scales terrain contacts to point along Plane Normal — Cheap — Good enough for this specific use case.
- 37. Speculative Contacts – Against Bodies 38
- 38. Speculative Contacts – Unity Physics — Worst case — Bullet velocity 45o to canonical axis — Bullet AABB expanded by velocity — Overlaps with the walls — Ghost collisions — Collision response — Velocity trimmed 40
- 39. Speculative Contacts – Havok Physics 43 — Behaviour
- 40. Speculative Contacts – Havok Physics 44 — Opt-in — No ghost collisions — No velocity reduction — It just works
- 41. Speculative Contacts – Vehicle Use Case 45 — Redo GIF
- 42. Simulation Differences 47 — Behaviour – Penetration Recovery – Stacking – Restitution – Speculative Contacts — Performance – Deactivation – CPU Usage
- 43. Havok Configuration – Deactivation 48 — Performance
- 44. Simulation Differences - Deactivation 49
- 45. Simulation Differences - Deactivation 50 — Not as simple as you might think! TM
- 46. Simulation Differences 51 — 12000 Dynamic Convex Hulls — Static Concave Mesh — Behaviour – Penetration Recovery – Stacking – Restitution – Speculative Contacts — Performance – Deactivation – CPU Usage
- 47. Simulation Differences 52 — Unity Physics – 40 ms — Havok Physics – 20 ms
- 48. Havok Configuration – Visual Debugger 53 — Tool Options
- 49. Tools 54 — Early Planet Gravity demo — What is going on here?
- 50. Tools – Unity Physics 55
- 51. Tools – Havok Physics 56
- 52. Tools – Havok Physics 57 — Havok Visual Debugger — Windows PC Client — Remote Connection — Scrubbable Timeline — Data Visualisation — Contacts — Deactivation — Motion Trails — Heat Map — Performance Metrics — Simulation Interaction
- 53. Tools – Havok Physics 58 — Havok Visual Debugger — Windows PC Client — Remote Connection — Scrubbable Timeline — Data Visualisation — Contacts — Deactivation — Motion Trails — Heat Map — Performance Metrics — Simulation Interaction
- 54. Tools – Havok Physics - Name the Game! 60
- 55. Tools – Havok Physics 61
- 56. Tools – Havok Physics - Name the Game! 62
- 57. Tools – Havok Physics 63
- 58. Tools – Havok Physics - Name the Game! 64
- 59. Tools – Havok Physics 65
- 60. Havok Physics - Summary 66
- 61. Havok Physics 67 — Same Data — Better Behaviour — Better Performance — Battle Hardened — Available now from package manager!
- 62. Havok Physics 68 — Initial Trial Package — Fully Functional — Expires January 15th 2020 — After Trial — Free for Unity Personal — Free for Unity Plus — Subscription for Unity Pro — $20 per month per seat
- 63. Roadmap Ideas 69
- 66. Air Density & Buoyancy 72
- 67. Lower-Fidelity Rigid Bodies 73 — 8x CPU Performance — 6DOF — 3DOF
- 68. Questions ? 74 Steve Ewart steve.ewart@microsoft.com Come find us at: — Expo Partners Area Microsoft Game Stack Booth — Expert Bar (Wed 3-5pm)
Editor's Notes
- Need Havok logo
- Back at GDC we announced a partnership with Unity to provide greater adoption of Havok Physics to Unity users * Created single data protocol for physics * More adoption of Havok Physics * Complete physics solution for Unity
- Back at GDC we announced a partnership with Unity to provide greater adoption of Havok Physics to Unity users * Created single data protocol for physics * More adoption of Havok Physics * Complete physics solution for Unity Emphasis cross platform Platform holders
- Over 700 titles released
- So let’s work together Common
- Created single data protocol for physics Unity Physics backend DOTS physics data representation and backend
- Data Component describe Physics World Build Physics World builds Collision World used for static queries This talk focusing on the Step Physics World which handles dynamic collision detection and response Export Physics World moves the updating dynamic physics data back to Data Component for other non-physics systems to consume
- https://docs.unity3d.com/2018.3/Documentation/Manual/ContinuousCollisionDetection.html#speculative Performance by default Speculative Continuous Collision Detection Expanded AABB with velocity
- Callback use to remove overlapping pairs Filtering that is very specific for a particular frame that is appropriate via collision filter. E.g turn of first x frames of an explosion
- Messing with Normals or dropping Tweaking with geometry information e.g. Backface culling Displacement map
- Tweaking with collision response e.g. fake infinite mas Soft contacts Surface velocity
- https://forum.unity.com/threads/unity-physics-discussion.646486/page-17#post-4993952 https://twitter.com/Nothke/status/1176282750833299458
- DummySimulation lets you turn of dynamics
- Using same data so just swap simulation Assuming working at level of Physics Components Simulation backends are different so worth knowing where
- https://forum.unity.com/threads/unity-physics-discussion.646486/page-17#post-4993952 https://twitter.com/Nothke/status/1176282750833299458
- Ghost collisions!
- Needed for Large timestep Fast moving object - Especially over flat tessellated meshes
- None flat Fast objects or large objects.
- https://docs.unity3d.com/2018.3/Documentation/Manual/ContinuousCollisionDetection.html#speculative
- Trivial deactivation is trivial Deactivation permeate every part of engine
- Scalable beyond 8 threads.
- Call to Action
- Physics Quality component