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[ND+04b]  Sketchy Drawings

Nienhaus:2004:SD (In proceedings)
Author(s)Nienhaus M. and Döllner J.
Title« Sketchy Drawings »
InProceedings of the 3[textsuperscript]rd International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa (AFRIGRAPH 2004)
Page(s)73--81
Year2004
PublisherACM Press
AddressNew York
URLhttp://www.hpi.uni-potsdam.de/~doellner/nienhaus/sketchydrawings.html

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.

BibTeX code
@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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