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Sketchy drawings

Content Provider	ACM Digital Library
Author	Döllner, Jürgen Nienhaus, Marc
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.
Starting Page	73
Ending Page	81
Page Count	9
File Format	PDF
ISBN	1581138636
DOI	10.1145/1029949.1029963
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2004-11-03
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Real-time rendering Hardware-acceleration Non-photorealistic rendering Depth sprites Image-space Sketching
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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