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Fabricating Microgeometry for Custom Surface Reflectance
ACM Transactions on Graphics (Proceedings of SIGGRAPH 2009)
Tim Weyrich1   Pieter Peers2  Wojciech Matusik3  Szymon Rusinkiewicz3,4
University College London1
University of Southern California, Institute for Creative Technologies2
Adobe Systems, Inc.3
Princeton University4

We propose a system for manufacturing physical surfaces that, in aggregate, exhibit a desired surface appearance. Our system begins with a user specification of a BRDF, or simply a highlight shape, and infers the required distribution of surface slopes. We sample this distribution, optimize for a maximally-continuous and valley-minimizing height field, and finally mill the surface using a computer-controlled machine tool. We demonstrate a variety of surfaces, ranging from reproductions of measured BRDFs to materials with unconventional high lights.

 


Abstract:

We present a novel image-based method for separating diffuse and specular reflections of real objects under distant environmental illumination. By illuminating a scene with only four high frequency illumination patterns, the specular and diffuse reflections can be separated by computing the maximum and minimum observed pixel values. Furthermore, we show that our method can be extended to separate the diffuse and specular component under image-based environmental illumination. Applications range from image-based modeling of reflectance properties to improved normal and geometry acquisition.

 


Material:

SIGGRAPH 2009 Paper:


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