Hardware-Raytracingを用いたフォトンマッピングの実装について

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1. Pocol (@ProjectAsura)
3. • • • • •
4. Photon Mapping (PM)
5. • • • • • • •
6. •
7. • • • • • •
8. • • • • • ※S: Specular, D: Diffuse を表す
9. Progressive Photon Mapping (PPM)
10. • アルゴリズム上の順番を変更する。 • 先にカメラからトレーシングして計算点を生成。 • 次にフォトントレーシングを繰り返して統計量を更新する。
11. • • • •
14. Stochastic Progressive Photon Mapping (SPPM)
15. • •
17. Fast Radius Search Exploiting Ray-Tracing Frameworks
18. • • • • •
19. • “Fast Radius Search Exploiting Ray-Tracing Frameworks” Journal of Computer Graphics Techniques, Vol.10, No.1, 2021. • GPU kd-tree • Acceleration Structure
20. 𝑟 𝑝1 𝑝2 𝑝3
21. 𝑟 𝑝1 𝑝2 𝑝3 𝑟 𝑟 𝑑
25. Accelerating Photon Mapping for Hardware-Based Ray Tracing
26. • • •
27. HitInfo, View Direction, Throughput Photon Flux, Photon Direction Photon AABB Acceleration Structure
28. HitInfo, View Direction, Throughput Photon Flux, Photon Direction Photon AABB Acceleration Structure
29. • • •
31. HitInfo, View Direction, Throughput Photon Flux, Photon Direction Photon AABB Acceleration Structure
32. HitInfo, View Direction, Throughput Photon Flux, Photon Direction Photon AABB Acceleration Structure
33. • • •
34. • • • • • •
35. 説明のため2D図
36. uint hashIdx = calcHash(photonCell) & (GRID_SIZE-1);
38. HitInfo, View Direction, Throughput Photon Flux, Photon Direction Photon AABB Acceleration Structure
39. HitInfo, View Direction, Throughput Photon Flux, Photon Direction Photon AABB Acceleration Structure
40. • • •
41. • • • •
42. HitInfo, View Direction, Throughput Photon Flux, Photon Direction Photon AABB Acceleration Structure
43. HitInfo, View Direction, Throughput Photon Flux, Photon Direction Photon AABB Acceleration Structure
44. • • • •
45. HitInfo, View Direction, Throughput Photon Flux, Photon Direction Photon AABB Acceleration Structure
46. HitInfo, View Direction, Throughput Photon Flux, Photon Direction Photon AABB Acceleration Structure
47. • • • • •
49. • • listSize/n n>listSize) listSize=3 •
50. フォトン収集の疑似コードを次のように変更
51. HitInfo, View Direction, Throughput Photon Flux, Photon Direction Photon AABB Acceleration Structure
52. HitInfo, View Direction, Throughput Photon Flux, Photon Direction Photon AABB Acceleration Structure
53. • 𝑟𝑖+1 = 𝑟𝑖 𝑖 + 𝛼 / 𝑖 + 1 𝑟 ： 𝑖 ： 𝛼： 𝛼は
59. 最後に…
60. • • • •
61. • [Kern 2023] Rene Kern, Felix Brull, Thorsten Grosch, “Accelerating Photon Mapping for Hardware-Based Ray Tracing”, Journal of Computer Graphics Techniques, Vol. 12, No.1, 2023 • [Hachisuka 2008] Toshiya Hachisuka, Shinji Ogaki, Henrik Wann Jensen, “Progressive Photon Mapping”, ACM Transaction on Graphics, Vol. 27, Issue 5, No. 130, pp1-8, 2008. • [Hachisuka 2009] Toshiya Hachisuka, Henrik Wann Jensen, “Stochastic progressive photon mapping”, SIGGRAPH Asia 2009 papers, No. 141, pp. 1-8, 2009. • [Evangelou 2021] I.Evangelou, G.Papaioannou, K.Vardis, A.A.Vasilakis, “Fast Radius Search Exploiting Ray-Tracing Frameworks”, Journal of Computer Graphics Techniques, Vo.10, No.1, 2021. • [Kaplanyan 2013] Anton S. Kaplanyan, Carsten Dachsbacher, “Adaptive Progressive Photon Mapping”, ACM Transactions on Graphics 32, 2 (April), 16:1–16:13. URL: https://doi.org/10.1145/2451236.2451242. • [Kanus 2011] Claude Kanus, Matthias Zwicker, “Progressive photon mapping: A probabilistic apparoch”, ASM Transactions on Graphics (TOG), Vol. 30, Issue 3, No. 25, pp.1-13, 2011.