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briefly describing the light stage used for the breakthrough capture of the BSDF over the human face by Debevec et al. in 2000 |
Referencing from 2004 SIGGRAPH "Facial modeling and animation" course notes some details about what the ESC Entertainment used for Matrix Reloaded and [[Matrix Revoli |
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| doi = 10.1145/344779.344855
| accessdate = "2013-07-21"}}
</ref> was one of the last key breakthroughs on the way to fully [[virtual cinematography]] with it's ultra-photorealistic [[digital look-alikes]]. The team was the 1st one in the world to [[isolate]] the [[subsurface scattering]] component ( a specialized case of BTDF ) using the simplest [[light stage]], consisting on moveable light source, moveable high-res [[digital camera]], 2 [[polarizers]] in a few positions and really simple [[algorithm]]s on a modest [[computer]]. <ref name="Deb2000"/>. The team utilized the [[existing]] [[scientific knowledge]] that [[light]] that is reflected and scattered from the air-to-oil layer [[retention|retains]] it's [[polarization]] while light that travels within the [[skin]] loses it's.<ref name="Deb2000"/>. The subsurface scattering component can be [[computer simulation|simulated]] as a steady high-scatter glow of light from within the [[3D model|model]]s, without which the skin does't just look realistic. [[ESC Entertainment]], a company set up by [[Warner Brothers Pictures]] specially to do the visual effects / virtual cinematography system for the [[Matrix Reloaded]] and [[Matrix Revolutions]] isolated the parameters for an approximate [[analytical]] BRDF which consisted of [[Fresnel equations|lambertian]] [[diffuse|diffusion]] component and a modified [[phong reflection model|Phong]] [[specular]] component with a [[Fresnel equations|Fresnel]] type of [[effect]]. <ref name="HaD2004">{{cite web
| last = "Haber"
| first = "Jörg"
| authorlink =
| coauthors = "Demetri Terzopoulos"
| title = Facial modeling and animation
| work =
| publisher = ACM
| year = 2004
| url = "http://dl.acm.org/citation.cfm?id=1103906"
| format = .
| doi = 10.1145/1103900.1103906
| accessdate = "2013-08-19"}}</ref>
==Overview of the BxDF functions==
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