@inproceedings{Nienhaus:2004:SD,
opteditor = {},
optnote = {},
optorganization = {},
author = {Marc Nienhaus and J{\"u}rgen D{\"o}llner},
optkey = {},
optseries = {},
url = {http://www.hpi.uni-potsdam.de/~doellner/nienhaus/sketchydrawings.html},
address = {New York},
localfile = {papers/Nienhaus.2004.SD.pdf},
publisher = {ACM Press},
doi = {http://doi.acm.org/10.1145/1029949.1029963},
optmonth = {},
citeseer = {},
optcrossref = {},
booktitle = {Proceedings of the 3\textsuperscript{rd} International Conference
on Computer Graphics, Virtual Reality, Visualisation and
Interaction in Africa (AFRIGRAPH 2004)},
optstatus = {OK},
optvolume = {},
optnumber = {},
title = {{S}ketchy {D}rawings},
abstract = {In non-photorealistic rendering sketchiness is essential to
communicate visual ideas and can be used to illustrate drafts and
concepts in, for instance, architecture and product design. In
this paper, we present a hardware-accelerated real-time rendering
algorithm for drawings that sketches visually important edges as
well as inner color patches of arbitrary 3D objects even beyond
the geometrical boundary. The algorithm preserves edges and color
patches as intermediate rendering results using textures. To
achieve sketchiness it applies uncertainty values in image-space
to perturb texture coordinates when accessing intermediate
rendering results. The algorithm adjusts depth information derived
from 3D objects to ensure visibility when composing sketchy
drawings with arbitrary 3D scene contents. Rendering correct depth
values while sketching edges and colors beyond the boundary of 3D
objects is achieved by depth sprite rendering. Moreover, we
maintain frame-to-frame coherence because consecutive uncertainty
values have been determined by a Perlin noise function, so that
they are correlated in image-space. Finally, we introduce a
solution to control and predetermine sketchiness by preserving
geometrical properties of 3D objects in order to calculate
associated uncertainty values. This method significantly reduces
the inherent shower-door effect.},
year = {2004},
pages = {73--81},
}
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