Fabricating microgeometry for custom surface reflectance

Tim Weyrich, Pieter Peers, Wojciech Matusik, Szymon Rusinkiewicz
2009 ACM Transactions on Graphics  
15 1 5 3 0 30 30 4 5 4 5 4 5 45 6 0 6 0 6 0 6 0 Figure 1: From left: a user-designed highlight is converted to an optimized microfacet height field. A computer-controlled milling machine is used to manufacture the surface (30×30 facets, each approximately 1 mm×1 mm), which exhibits the desired reflectance. Abstract 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
more » ... ghlight 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 highlights.
doi:10.1145/1531326.1531338 fatcat:pjavicy6bvh6ncytnv33mflvdu