Umbra provides rendering optimization technology that helps improve graphics performance by only drawing what the camera can see. Their current product, Umbra 3.1, is available for several platforms and uses a pre-computed "Tome" to perform occlusion culling at runtime. Upcoming features include an incremental bake that only recomputes changed areas of a scene to reduce baking times.

1. Umbra, Unity and rendering optimization 10/1/2012 Sampo ”Anvil” Lappalainen & Thomas Puha IGDA Unity evening

2. Founded in 2006, Helsinki, Finland 13 full-time employees In the business of occlusion culling = rendering performance optimizing Plenty of shipped games utilizing Umbra’s tech: Alan Wake, Mass Effect 2-3, Dragon Age 1-2, Age of Conan etc Current product Umbra 3.1 (CPU, CPU/GPU) Available for PlayStation 3, Xbox 360, PlayStation Vita, iOS, pc, Android and future console platforms...

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5. What do we offer? “Umbra rendering optimization” Helping to optimize graphics rendering to enable better performance Only draw what the camera sees - visibility solution Basis of a 3D engine – but very difficult problem to solve well Umbra’s core engineering team has worked on this since 2000 More and more technology-driven studios choose our solution Mature technology and it works – easy to integrate

6. Umbra tech timeline Umbra 1 - 2007 Hierarchical representation of the scene GPU occlusion queries for visibility testing Umbra 2 (OB) - 2009 Multithreaded Umbra 1 Built to work optimally on PS3 / Xbox 360 Umbra 3 - 2011 Umbra Optimizer for visibility baking Umbra Runtime for CPU operations

7. Umbra and Unity 3.5 Pro Umbra 3.0 pre-integrated All Unity platforms covered Optimizer : Visibility ”bake” Take scene, computation parameters as input Produces a Tome Runtime: Perform occlusion culling using the pre-computed Tome

8. Upcoming features Incremental Bake When a change is made to the scene, only the affected areas need to be recomputed Dramatic reduction in baking times ” Grizzly” culling algorithm Improved portal culling algorithm All new, groundbreaking, next-level, way of doing things!

9. Live Umbra 3 and Unity demo Recap: Best practices

10. Tip 1: Set tight Occlusion Areas Don’t compute the parts of the scene where camera cannot go Gains: Faster computation Smaller runtime memory footprint

11. Tip 2: Choose the right culling algorithm Different data needs to be computed for different algorithms PVS Simple lookup in runtime, fast! PVS with dynamic objects Larger runtime data size Portal More accurate than the PVS test Fast to test dynamic objects

12. Tip 3: Computation parameters Huge impact on both computation time and culling quality View Cell Size: Smaller values take longer to compute, but produce better occlusion Near Clip Plane: How close to the geometry can the runtime camera go Start with default values and tweak one parameter at a time

13. Thank you for listening (Thanks IGDA and Unity) Enjoy a free ”Tome” drink on us tonight! umbra3.com