A data-driven reflectance model

  • Authors:
  • Wojciech Matusik;Hanspeter Pfister;Matt Brand;Leonard McMillan

  • Affiliations:
  • MIT, Cambridge, MA.;MERL, Cambridge, MA.;MERL, Cambridge, MA.;UNC, Chapel Hill, NC.

  • Venue:
  • ACM SIGGRAPH 2003 Papers
  • Year:
  • 2003

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Abstract

We present a generative model for isotropic bidirectional reflectance distribution functions (BRDFs) based on acquired reflectance data. Instead of using analytical reflectance models, we represent each BRDF as a dense set of measurements. This allows us to interpolate and extrapolate in the space of acquired BRDFs to create new BRDFs. We treat each acquired BRDF as a single high-dimensional vector taken from a space of all possible BRDFs. We apply both linear (subspace) and non-linear (manifold) dimensionality reduction tools in an effort to discover a lower-dimensional representation that characterizes our measurements. We let users define perceptually meaningful parametrization directions to navigate in the reduced-dimension BRDF space. On the low-dimensional manifold, movement along these directions produces novel but valid BRDFs.