Slides Hair Rendering
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Talk about the Paper Real Time hair rendering under Global Illumination published at SIGGRAPH 10\\’
![Hair Rendering Hair fiber represented with lines primitives Basic shading model is not realistic at all. 1 fiber 4 strands Basic OpenGL illumination Deep Opacity Map [YUK08]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Slides Hair Rendering
- 1. Interactive Hair Rendering Under Environment Lighting Valentin JANIAUT Zhong Ren, Kun Zhou, Tengfei Li, Wei Hua, Baining Guo
- 2. Hair Rendering Hair fiber represented with lines primitives Basic shading model is not realistic at all. 1 fiber 4 strands Basic OpenGL illumination Deep Opacity Map [YUK08]
- 3. Environment Lighting Natural Illumination No directional light Single Light Environment Lighting
- 4. Spherical Function How to represent a spherical function? SRBF
- 6. SRBF and Environment Lighting We can now represent the environment lighting as the sum of the SRBF lights, as following:
- 7. Outgoing Curved Intensity Diameter of the hair fiber Bidirectional scattering function Transmittance Environment Lighting
- 12. Convolving SRBF and Scattering Function Marschner et al. model [2003] With: cos(ϕξ-ϕo)
- 14. Use of the Deep Opacity Map techniquePrecomputed in a table
- 15. Self-shadowing Opacity Shadow Map Deep Opacity Map
- 16. Deep Opacity Map Zo Z1 Z2 Z3 T z z1 z2 z3 Compute the optical depth
- 17. Multiple Scattering More realistic model. Convolution of SRBF and scattering function. Transmittance
- 18. Multiple Scattering Computation Voxelize Hair Model For each voxel store: ϖ: Average Fiber Direction ν : Standard Deviation of fiber direction ςtΤ : Perpendicular Attenuation Coefficient Sample Tfand σfon a rough grid Store as 3D texture Hardware tri-linear interpolation
- 20. Generate Deep Opacity Depth Map (DODM)
- 21. Construct the Summed Area Table
- 22. Sample the effective transmittance
- 23. Sample the single scattering integralPrecompute SRBF decomposition Single Scattering integration table
- 24. Results
- 25. Limitations Runtime change of hair properties precomputation is costly (~50 minutes) Eccentricity of hair scattering is omitted Additional video memory for the integral tables 12MB for single scattering 24MB for single + multiple scattering no per-fiber hair property
- 26. References http://www.kunzhou.net/ (Author of the main paper, some of his slides are used in this slideshow) http://www.cemyuksel.com/ (Author of the Deep Opacity Maps and numerous other paper about hair rendering) Illustration on slide 10 comes from wikipedia. http://www.cse.cuhk.edu.hk/~ttwong/papers/srbf/srbf.html Lecture about SRBF.
- 27. Q/A