Bidirectional scattering distribution function: Difference between revisions

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* Acquisition of the BSDF over the [[human face]] in 2000 by [[Paul Debevec|Debevec]] et al.<ref name="Deb2000">{{cite web

| last = "Debevec"

| first = "Paul"

| authorlink =

| author2 = Tim Hawkins

| coauthors = "Tim Hawkins, Chris Tchou, Haarm-Pieter Duiker, Westley Sarokin, Mark Sagar"

| author3 = Chris Tchou

| author4 = Haarm-Pieter Duiker

| author5 = Westley Sarokin

| author6 = Mark Sagar

| title = Acquiring the reflectance field of a human face

| work =

| publisher = ACM

| year = 2000

| url = "http://dl.acm.org/citation.cfm?id=344855"

| format =

| 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 its ultra-photorealistic [[digital look-alike]]s. The team was the first 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 retains its [[Polarization (waves)|polarization]] while light that travels within the [[skin]] loses its.<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 not 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 [[lambertian]] [[diffuse|diffusion]] component and a modified [[specular]] [[phong reflection model|Phong]] component with a [[Fresnel equations|Fresnel]] type of [[Visual effects|effect]].<ref name="HaD2004">{{cite web

| last = "Haber"

| first = "Jörg"

| authorlink =

| coauthorsauthor2 = "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