Curvature-based shading of translucent materials, such as human skin

ABSTRACT

The paper introduces a new approximate method for rendering translucent materials. We represent the surface around a point to be rendered in Monge's form using principal curvatures. The subsurface reflectance equation in the dipole diffusion approximation [Jensen et al. 2001] is then integrated over the surface. The outgoing radiance at the point is expressed as a function of principal curvatures and light vector components along the principal directions. This function can be precomputed as a 2D lookup table, which can be stored as a texture image. The paper presents preliminary results of our work on implementation of the model described.

REFERENCES

• 1: Francesco Banterle, A fast translucency appearance model, ACM SIGGRAPH 2005 Posters, July 31-August 04, 2005, Los Angeles, California [doi>10.1145/1186954.1187002]
• 2: Bredow, R. 2002. Renderman on film. In SIGGRAPH 2002 Course Notes. Course 16., 6, 7.
• 3: Nathan A. Carr , Jesse D. Hall , John C. Hart, GPU algorithms for radiosity and subsurface scattering, Proceedings of the ACM SIGGRAPH/EUROGRAPHICS conference on Graphics hardware, July 26-27, 2003, San Diego, California
• 4: Carsten Dachsbacher , Marc Stamminger, Translucent shadow maps, Proceedings of the 14th Eurographics workshop on Rendering, June 25-27, 2003, Leuven, Belgium
• 5: Craig Donner , Henrik Wann Jensen, Light diffusion in multi-layered translucent materials, ACM SIGGRAPH 2005 Papers, July 31-August 04, 2005, Los Angeles, California
• 6: Donner, C., and Jensen, H. W. 2006. A spectral bssrdf for shading human skin. In Proceedings of the Eurographics Symposium on Rendering, 409--417.
• 7: Green, S. 2004. GPU Gems: Programming Techniques, Tips, and Tricks for Real-Time Graphics. Addison-Wesley Professional, March, ch. Real-Time Approximations to Subsurface Scattering, 264--266.
• 8: Pat Hanrahan , Wolfgang Krueger, Reflection from layered surfaces due to subsurface scattering, Proceedings of the 20th annual conference on Computer graphics and interactive techniques, p.165-174, September 1993 [doi>10.1145/166117.166139]
• 9: Xuejun Hao , Amitabh Varshney, Real-time rendering of translucent meshes, ACM Transactions on Graphics (TOG), v.23 n.2, p.120-142, April 2004 [doi>10.1145/990002.990004]
• 10: Henrik Wann Jensen , Juan Buhler, A rapid hierarchical rendering technique for translucent materials, ACM Transactions on Graphics (TOG), v.21 n.3, July 2002
• 11: Henrik Wann Jensen , Stephen R. Marschner , Marc Levoy , Pat Hanrahan, A practical model for subsurface light transport, Proceedings of the 28th annual conference on Computer graphics and interactive techniques, p.511-518, August 2001 [doi>10.1145/383259.383319]
• 12: Hendrik P. A. Lensch , Michael Goesele , Philippe Bekaert , Jan Kautz , Marcus A. Magnor , Jochen Lang , Hans-Peter Seidel, Interactive Rendering of Translucent Objects, Proceedings of the 10th Pacific Conference on Computer Graphics and Applications, p.214, October 09-11, 2002
• 13: Tom Mertens , Jan Kautz , Philippe Bekaert , Frank Van Reeth , Hans-Peter Seidel, Efficient Rendering of Local Subsurface Scattering, Proceedings of the 11th Pacific Conference on Computer Graphics and Applications, p.51, October 08-10, 2003
• 14: Nicodemus, F. E., Richmond, J. C., Hisa, J. J., Ginsberg, I. W., and Limperis, T. 1977. Geometrical Considerations and Nomenclature for Reflectance. Monograph number 160. National Bureau of Standards.
• 15: Schey, H. M. 1992. Div, Grad, Curl, and All That: An Informal Text on Vector Calculus. W. W. Norton.
• 16: Schlick, C. 1994. An inexpensive brdf model for physically-based rendering. Computer Graphics Forum 13, 3, 233--246.
• 17: Peter-Pike Sloan , Jan Kautz , John Snyder, Precomputed radiance transfer for real-time rendering in dynamic, low-frequency lighting environments, ACM Transactions on Graphics (TOG), v.21 n.3, July 2002
• 18: Peter-Pike Sloan , Jesse Hall , John Hart , John Snyder, Clustered principal components for precomputed radiance transfer, ACM SIGGRAPH 2003 Papers, July 27-31, 2003, San Diego, California
• 19: Jos Stam, An Illumination Model for a Skin Layer Bounded by Rough Surfaces, Proceedings of the 12th Eurographics Workshop on Rendering Techniques, p.39-52, June 25-27, 2001
• 20: Weisstein, E. W. Monge's form. MathWorld--A Wolfram Web Resource, http://mathworld.wolfram.com/MongesForm.html.

INDEX TERMS

Primary Classification:
  I. Computing Methodologies
  I.3 COMPUTER GRAPHICS
      I.3.7 Three-Dimensional Graphics and Realism

Keywords:
rendering, subsurface scattering