Introduction to Real- T ime Ray Tracing

1. Introduction toReal-Time Ray Tracing Peter Shirley Chris Wyman Morgan McGuire NVIDIA

2. Introduction to Real-Time Ray Tracing Part 2Course Overview Peter Shirley NVIDIA

3. RAY TRACING: INTRODUCED BY TURNER WHITTED IN 1979 • Mirrors, glass, shadows • Multi-sampled AA • Hand-built BVH • 1980s Glossy reflection, diffuse inter-reflection • 2000s Movie rendering • 2010s De-noising • now interactive

4. HARD SHADOWS

5. SOFT SHADOWS

6. DIFFUSE INTER-REFLECTION

7. SPECULAR REFLECTION

8. ONE SAMPLE PER PIXEL

9. COURSE SCHEDULE • Now-2:55pm Peter Shirley Introduction to ray tracing • 3:05-3:55 Chris Wyman Going fast: Parallelizing Your Ray Tracer • 4:05-5:15 Morgan Mcguire

31. Without random sampling Q = light center P = shaded point Shadow ray = P + t*(Q-P) Is there a hit for t in [0.001, 0.999]?

32. Without random sampling Q = light center P = shaded point Shadow ray = P + t*(Q-P) Is there a hit for t in [0.001, 0.999]? With random sampling Q = light center + random_in_sphere_of_radius(0.3) P = shaded point Shadow ray = P + t*(Q-P) Is there a hit for t in [0.001, 0.999]?

36. eye

37. eye

38. eye

39. eye

40. eye

41. eye

42. eye glass

43. eye glass

44. eye Multiplier = 1.0 glass

45. eye Randomly perturb? glass

46. eye glass

47. eye glass

48. Random Points on Triangles

49. Random Points on Triangles

50. Random Points on Triangles (1,1) y P = f(x,y)A + g(x,y)*B + (1-f(x,y)-g(x,y))*C x (0,0)