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Pont, S.C. (author), van Doorn, A.J. (author), Koenderink, J.J. (author)We studied whether human observers can estimate the illumination direction from 3D textures of random Brownian surfaces, containing undulations over a range of scales. The locally Lambertian surfaces were illuminated with a collimated beam from random directions. The surfaces had a uniform albedo and thus texture appeared only through shading...journal article 2017