Abstract
Despite the horsepower and the flexibility of current graphics hardware, advanced render engines use the fast Blinn-Phong BRDF model for simulating material appearance taking off limitation for physically plausible material simulation. We propose an alternative to the Blinn-Phong model based on Bidirectional Texture Functions, which we compress with McAllister's approach to obtain a Spatial Bidirectional Reflectance Distribution Function (SBRDF). Then, we upgrade the SBRDF with a residual function that we deduce from the reconstruction error of the SBRDF model. We analyze the impact of the residual function on the quality of the approximation. Finally, we propose a rendering algorithm for our method and analyse its performances.
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