Data and downloads
Here are some links to resources that you might find useful.
Measured Isotropic BRDFs
The MERL BRDF database contains reflectance functions of 100 different materials.Each reflectance function is stored as a densely measured Bidirectional Reflectance Distribution Function (BRDF).
MERL provides this data only for research or academic use. Sample code to read the data is included with the database. Note that parameterization of theta-half has changed.
Experimental Analysis of BRDF Models
This document is supplemental to the paper titled Experimental Analysis of BRDF Models, published at Eurographics Symposium on Rendering 2005. In the following section we list the equations for the BRDF models employed in our isotropic analysis. The rest of the document contains complete fitting results for the 100 isotropic materials, together with BRDF plots in the incidence plane, and sample images.
Measured Anisotropic BRDFs
The Bidirectional Reflectance Distribution Function (BRDF) describes the appearance of a material by its interaction with light at a surface point. A variety of analytical models have been proposed to represent BRDFs. However, analysis of these models has been scarce due to the lack of high-resolution measured data. In this work we evaluate several well-known analytical models in