Painting with Light (Scenic City Summit)
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Learn how to render beautiful images like Pixar and Disney using a simple algorithm called path tracing. In this talk, we'll trace the paths of billions of photons with Go on commodity hardware. Together, we'll explore concurrency, the behavior of light, and the future of computer graphics.
Painting with Light (Scenic City Summit)
- 1. @hunterloftis Painting with Light Scenic City Summit 2018
- 2. @hunterloftis 1940s: The Manhattan Project
- 4. @hunterloftis 1986: Kajiya's rendering equation
- 5. @hunterloftis 1986: Kajiya's rendering equation $44,000,000 / GFLOPS
- 7. @hunterloftis There are more PhDs working on this film than any other in movie history. - Steve Jobs, Pixar, 1995
- 8. @hunterloftis There are more PhDs working on this film than any other in movie history. - Steve Jobs, Pixar, 1995 $46,000 / GFLOPS
- 12. @hunterloftis 2006: Monster House $57 / GFLOPS
- 14. @hunterloftis 2014: Big Hero 6 $0.13 / GFLOPS
- 15. @hunterloftis
- 17. @hunterloftis 4 render farms 4,600 servers
- 18. @hunterloftis 4 render farms 4,600 servers 83 hrs / frame
- 22. @hunterloftis 2016: Path-tracing only $0.08 / GFLOPS
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- 46. @hunterloftis ...time to learn Go!
- 47. @hunterloftis $ make moses (516,526 surfaces!)
- 49. @hunterloftis Building a physically-based path tracer In plain English
- 50. @hunterloftis Building a physically-based path tracer In plain English ...with as little math as possible
- 51. @hunterloftis Building a physically-based path tracer In plain English ...with as little math as possible ...and just a touch of physics.
- 53. @hunterloftis
- 57. @hunterloftis Origin + Direction + Energy
- 58. @hunterloftis What happens when light hits a surface?
- 59. @hunterloftis
- 64. @hunterloftis transmittance diffusion Once refracted, light is either transmitted or diffused
- 65. @hunterloftis All incoming light is either... 3. transmitted 1. reflected 2. diffused
- 66. @hunterloftis How can we simulate these three behaviors? 3. transmitted 1. reflected 2. diffused
- 67. @hunterloftis BRDFs and BTDFs! "Bidirectional Reflectance Distribution Function" "Bidirectional Transmittance Distribution Function"
- 68. @hunterloftis BRDFs and BTDFs! "Bidirectional Reflectance Distribution Function" "Bidirectional Transmittance Distribution Function"
- 69. @hunterloftis A pure function that describes a material
- 70. @hunterloftis The physics have been done for us! Metals microfacet BRDF Non-metals microfacet + Oren-Nayar BRDFs Transparent materials microfacet BTDF + Beer's law ...car paint, hair, thin films, clouds, skin...
- 71. @hunterloftis But... that's just one random path!
- 72. @hunterloftis But... that's just one random path!
- 75. @hunterloftis Monte Carlo integration Sample a bunch of values randomly.
- 76. @hunterloftis Monte Carlo integration Sample a bunch of values randomly. Add them all up and average them.
- 77. @hunterloftis Monte Carlo integration Sample a bunch of values randomly. Add them all up and average them. Thats probably close to the real answer.
- 78. @hunterloftis Path tracing + Monte Carlo integration rendered with github.com/hunterloftis/pbr
- 79. @hunterloftis Path tracing + Monte Carlo integration rendered with github.com/hunterloftis/pbr
- 80. @hunterloftis Path tracing + Monte Carlo integration rendered with github.com/hunterloftis/pbr
- 81. @hunterloftis 15x improvement over JS! rendered with github.com/hunterloftis/pbr
- 83. + Light Transport Algorithms (path tracing, monte carlo integration) Physically-Based Materials (BRDF, BSDF, etc)
- 84. https://github.com/google/filament + Light Transport Algorithms (path tracing, monte carlo integration) Physically-Based Materials (BRDF, BSDF, etc)
- 85. https://github.com/google/filament https://github.com/fogleman/pt + Light Transport Algorithms (path tracing, monte carlo integration) Physically-Based Materials (BRDF, BSDF, etc)
- 86. https://github.com/google/filament https://github.com/fogleman/pt rendered with github.com/hunterloftis/pbr + Light Transport Algorithms (path tracing, monte carlo integration) Physically-Based Materials (BRDF, BSDF, etc)
- 87. @hunterloftis How can we make more interesting images?
- 88. @hunterloftis Complex geometry rendered with github.com/hunterloftis/pbr
- 89. @hunterloftis Complex geometry rendered with github.com/hunterloftis/pbr
- 90. @hunterloftis Complex geometry rendered with github.com/hunterloftis/pbr
- 91. @hunterloftis Real materials rendered with github.com/hunterloftis/pbr
- 92. @hunterloftis Real materials rendered with github.com/hunterloftis/pbr
- 93. @hunterloftis Real materials rendered with github.com/hunterloftis/pbr
- 94. @hunterloftis Real materials rendered with github.com/hunterloftis/pbr
- 95. @hunterloftis Image-based lighting rendered with github.com/hunterloftis/pbr
- 96. @hunterloftis Image-based lighting rendered with github.com/hunterloftis/pbr
- 97. @hunterloftis Image-based lighting rendered with github.com/hunterloftis/pbr
- 98. @hunterloftis Image-based lighting rendered with github.com/hunterloftis/pbr
- 100. @hunterloftis 2018
- 101. @hunterloftis 2018
- 102. @hunterloftis 2018
- 103. @hunterloftis 2018
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- 105. @hunterloftis An exciting, emerging field Research that hasn't been implemented yet "Embarrassingly parallel" algorithm Fun to hack on!
- 106. @hunterloftis I would love your help! roadmap: distributed concurrency smoothing groups & normal maps glTF support expanding the material library beautiful example scenes!