Forrester Cole Kevin Sanik Douglas DeCarlo Adam Finkelstein Thomas A. Funkhouser Szymon Rusinkiewicz Manish Singh How well do line drawings depict shape? 2009 28 ACM Trans. Graph. 3 http://doi.acm.org/10.1145/1531326.1531334 db/journals/tog/tog28.html#ColeSDFFRS09