Hendrik P. A. Lensch Michael Goesele Jan Kautz Wolfgang Heidrich Hans-Peter Seidel Image-Based Reconstruction of Spatially Varying Materials. 103-114 2001 conf/rt/2001 Rendering Techniques db/conf/rt/rt2001.html#LenschGKHS01 https://doi.org/10.1007/978-3-7091-6242-2_10 https://doi.org/10.2312/EGWR/EGWR01/103-114