Philbrick, GregKaplan, Craig S.Kaplan, Craig S. and Forbes, Angus and DiVerdi, Stephen2019-05-202019-05-202019978-3-03868-078-9https://doi.org/10.2312/exp.20191082https://diglib.eg.org:443/handle/10.2312/exp20191082We define hatching-a drawing technique-as rigorously as possible. A pure mathematical formulation or even a binary this-or-that definition is unreachable, but useful insights come from driving as close as we can. First we explain hatching's purposes. Then we define hatching as the use of patches: groups of roughly parallel curves that form flexible, simple patterns. After elaborating on this definition's parts, we briefly treat considerations for research in expressive rendering.Computing methodologiesNonphotorealistic renderingImage processingTexturing10.2312/exp.20191082111-121