In Praise of an Alternative BRDF Parametrization

Pascal Barla (1, 2, 3) , Laurent Belcour (4) , Romain Pacanowski (1, 2)

1 MANAO - Melting the frontiers between Light, Shape and Matter
2 LP2N - Laboratoire Photonique, Numérique et Nanosciences
3 LaBRI - Laboratoire Bordelais de Recherche en Informatique
4 UdeM - Université de Montréal

In this paper, we extend the work of Neumann et al. [NNSK99] and Stark et al. [SAS05] to a pair of 4D BRDF parameterizations with explicit changes of variables. We detail their mathematical properties and relationships to the commonly-used halfway/difference parametrization, and discuss their benefits and drawbacks using a few an- alytical test functions and measured BRDFs. Our preliminary study suggests that the alternative parametrization inspired by Stark et al. [SAS05] is superior, and should thus be considered in future work involving BRDFs.

Mots clés: BRDF parametrization; change of variable; measured materials

Domaines: Synthèse d'image et réalité virtuelle [cs.GR]; Recherche d'information [cs.IR]

Pascal Barla, Laurent Belcour, Romain Pacanowski. In Praise of an Alternative BRDF Parametrization. Workshop on Material Appearance Modeling, Jun 2015, Darmstadt, Germany. ⟨hal-01172118⟩