1. Deep Screen Space Oliver Nalbach, Tobias Ritschel, Hans-Peter Seidel

2. Screen Space Shading 3/15/2014Oliver Nalbach - Deep Screen Space2 [Bavoil et al. ‘08] [Ritschel et al. ‘09] [Jimenez et al. ‘09]

3. Gathering in Screen Space 3/15/2014Oliver Nalbach - Deep Screen Space3

4. Screen Space Tradeoffs Advantages Fast computation Inherently dynamic Versatile – Ambient occlusion – Indirect light – Scattering – Depth of field Disadvantages Typically used for small effect distances Strong view dependency – Grazing angles – Occlusions 3/15/2014Oliver Nalbach - Deep Screen Space4

5. Example: Missing Occlusions 3/15/2014Oliver Nalbach - Deep Screen Space5 Horizon Based AO [Bavoil et al. 2008] Raytracing

6. “Deep” Screen Space 3/15/2014Oliver Nalbach - Deep Screen Space6 Framebuffer Deep screen space informationScreen space information

7. Two Necessary Steps 3/15/2014Oliver Nalbach - Deep Screen Space7 ??

8. Distance-dependent Surfel Radii 3/15/2014Oliver Nalbach - Deep Screen Space8

9. Two Necessary Steps 3/15/2014Oliver Nalbach - Deep Screen Space9 ?

10. Distance-dependent Accuracy 3/15/2014Oliver Nalbach - Deep Screen Space10 Level of Detail surfel 3 1 1 1 2 2

11. How to Sub-Sample? Low Resolution, Many SamplesHigh Resolution, Few Samples 3/15/2014Oliver Nalbach - Deep Screen Space11

12. Gathering from Hierarchy? 3/15/2014Oliver Nalbach - Deep Screen Space12 [Lischinski et al. 1993] [Jensen & Buhler 2002] [Christensen 2008]

13. Shell Splatting Idea 3/15/2014Oliver Nalbach - Deep Screen Space13 Shell 0 Sampling: 1/1 Shell 1 Sampling: 1/4 Shell 2 Sampling: 1/16

14. 3 Our Pipeline 3/15/2014Oliver Nalbach - Deep Screen Space14 1 4 2

15. Hardware Surfel Cloud Generation 3/15/2014Oliver Nalbach - Deep Screen Space15 Hardware tessellation … in point mode

16. Problem: Protruding Surfels 3/15/2014Oliver Nalbach - Deep Screen Space16 Move surfels towards center

17. Shell Splatting Implementation 3/15/2014Oliver Nalbach - Deep Screen Space17 Level 0 Level 1 Level 2

18. How to Compute the Splat Size? 3/15/2014Oliver Nalbach - Deep Screen Space18

19. Joint Bilateral Blurring 3/15/2014Oliver Nalbach - Deep Screen Space19 Level 0Level 1 Level 2 Level 0Level 1 Level 2

20. Combining the Levels 3/15/2014Oliver Nalbach - Deep Screen Space20 Level 0Level 1 Level 2 +

21. Application: Ambient Occlusion 3/15/2014Oliver Nalbach - Deep Screen Space21 Deep screen space AO Horizon Based AO [Bavoil et al. 2008] Raytracing 10 ms22 ms> 1 s

22. Application: Sub-surface Scattering 3/15/2014Oliver Nalbach - Deep Screen Space22 Deep screen space Sub-surface Scattering Screen Space Sub-surface Scattering [Jimenez et al. 2009] Diffusion approximation based on irradiance samples [Jensen and Buhler 2002] 5 ms22 ms> 1 s

23. Problem: Indirect Visibility 3/15/2014Oliver Nalbach - Deep Screen Space23 Occluder Object Light source Raytracing Deep screen space

24. Conclusion Supports arbitrarily deforming geometry Similar efficiency but without the strong viewing angle dependency Fits the rendering pipeline More applications seem possible – Indirect lighting of volumes – Motion blur – Depth of field 3/15/2014Oliver Nalbach - Deep Screen Space24

25. Thank you. 3/15/2014Oliver Nalbach - Deep Screen Space25 Project page: http://www.mpi-inf.mpg.de/~onalbach/DeepScreenSpace/http://www.mpi-inf.mpg.de/~onalbach/DeepScreenSpace/ Contact: onalbach(at)mpi-inf.mpg.de