1. How to Create a Thousand Lights Stephen Smithbower Computer Science Undergraduate

2. Lighting is an Artistic Tool - Creates mood and atmosphere - Colours can be calming - Useful for both realism and surrealism or abrasive

3. Author: Brooks Elliot @ 3drender.com

4. Author: Dan Konieczka @ 3drender.com

5. Author: Hans Tetzloff @ 3drender.com

6. Author: Michal Kotek @ 3drender.com

7. Lighting is Complex And is therefore slow to render.. - Each frame of video = 1/24th of a second - Each frame takes on average 6 hours to render Some frames take up to 90 hours! Pixar Authorship: Disney Pixar Studios

8. Real-Time Is a Bit More Restrictive For smooth movement, the entire frame must be rendered in... 16 milliseconds (1/60th of a second, or 60 frames per second)

9. Don’t Be Pixar Aesthetically plausible, not physically accurate

10. The Graphics Processing Unit (GPU) - Excels at parallel tasks - Much more processing power than the CPU - Built specifically for real-time graphics

11. Forward Shading 11 Yellow Light 11 Blue Light

12. Forward Shading 11 Yellow Light Render this, GPU! 1 Draw Call

13. Forward Shading 11 Blue Light Render this, GPU! 2 Draw Calls

14. Forward Shading 11 Yellow Light Render this, GPU! 3 Draw Calls

15. Forward Shading 11 Blue Light Render this, GPU! 4 Draw Calls

16. So What’s the Problem? Bottleneck !

17. You’ve got a relay team.. GPU

18. Bottleneck! CPU

19. Forward Rendering Scene Complexity Most Video Games In Here

20. New Approach - Don’t send redundant data - Don’t worry about what is not in view - Decouple Light and Geometry data Current Complexity: # Objects x # Lights Desired Complexity: # Objects + # Lights

21. Light Pre-Pass Step 1: Encode Visible Geometry into a Texture Depth Normals 5

22. Light Pre-Pass Step 2: Draw Lights as Spheres

23. Light Pre-Pass Step 3: Render Scene Again - Modulate Lighting x=

24. Comparison of Rendering Scene Complexity

28. Rendered on a 2.4ghz dual-core processor, Geforce 8600gts video card About $500 total, at time of purchase Questions? http://www.youtube.com/watch?v=MYMMgI9CDow

29. Acknowledgements Dr. Ramon Lawrence Computer Science Department