Coefficients used in rendering Plate 1 for the paper
 "Image-Based BRDF Measurement Including Human Skin",
  by Stephen R. Marschner, Stephen H. Westin, Eric P. F. Lafortune,
  Kenneth E. Torrance, and Donald P. Greenberg.
  Presented at the Eurographics Workshop on Rendering, Granada, Spain,
  June 21-23, 1999.

All data Copyright 2001, Cornell University Program of Computer
Graphics.  License is hereby granted for non-commercial use of the
data. The data may only be redistributed in full, including this
copyright notice. Any commercial use of these data requires the
permission of the Cornell University Program of Computer Graphics. All
published works using these data should acknowledge the Cornell
University Program of Computer Graphics.

Format:

o Columns represent R,G,B

o Diffuse values are BRDF values: max is 1/pi for an ideal Lambertian
  reflector.

o Each "lobe" has lines containing the coefficients Cx, Cz, and n
  from the SIGGRAPH 97 paper,
  "Non-Linear Approximation of Reflectance Functions",
   by Lafortune, Foo, Torrance, and Greenberg.
  Since this is an isotropic surface, Cy=Cx.

o The lobes were fitted separately to the R, G, and B raw camera
  values. The matrix we used in the 1999 paper to convert from this
  color space to a visual RGB space corresponding to Trinitron
  phosphors is

   1.063302,  0.382044, -0.445346
  -0.298125,  1.667665, -0.369540
  -1.322302, -0.446321,  2.768624

  Treat the RGB triples as column vectors for this transformation.

  Since this is a nonlinear representation, this color transformation
  cannot be applied to the coefficients; it must instead be applied to
  the RGB colors computed by the model. The raw data also cannot be
  transformed without further processing because the nature of the
  camera's sensor means that the R, G, and B samples are not co-located.

surface primergray
	diffuse	0.037634 0.038585 0.042402
	lobe	-0.399286 -1.033473 -1.058104
		0.167504 0.009545 -0.068002
		2.466633 7.637253 8.117645
	lobe	-1.041861 -1.100108 -1.087779
		0.014375 -0.198147 -0.053605
		7.993722 29.446268 41.988990
	lobe	-1.098605 -0.379883 -0.449038
		-0.145110 0.159127 0.173224
		31.899719 2.372852 2.636161

File revised 12 January 2001