.
An Illustration Technique Using Hardware-Based Intersections and Skeletons
Oliver Deussen, Jörg Hamel, Andreas Raab, Stefan Schlechtweg, Thomas Strothotte.
Graphics Interface (GI'99), pp. 175--182,
1999. [BibTeX]
Beyond Stippling - Methods for Distributing Objects on the Plane
Stefan Hiller, Heino Hellwig, Oliver Deussen.
Computer Graphics Forum, Vol. 22, No. 3, September,
2003. [BibTeX]
Computer-Generated Pen-and-Ink Illustration of Trees
Oliver Deussen, Thomas Strothotte.
SIGGRAPH 00,
2000. [BibTeX]
Floating Points: A Method for Computing Stipple Drawings
Oliver Deussen, Stefan Hiller, Cornelius Overveld, Thomas Strothotte.
Computer Graphics Forum (EG'00), Vol. 19, No. 3, pp. 40--51,
2000. [BibTeX]
Image Enhancement by Unsharp Masking the Depth Buffer
Thomas Luft, Carsten Colditz, Oliver Deussen.
ACM Transactions on Graphics (Proc. of SIGGRAPH'06), Vol. 25, No. 3, pp. 1206--1213, July,
2006. [BibTeX]
Interactive Watercolor Animations
Thomas Luft, Oliver Deussen.
13th Pacific Conference on Computer Graphics and Applications (PG'05), Macau, October 12-14th,
2005. [BibTeX]
Non-Photorealistic Real-Time Rendering of Characteristic Faces
Thomas Luft, Oliver Deussen.
12th Pacific Conference on Computer Graphics and Applications (PG'04),
2004. [BibTeX]
Real-Time Pen-and-Ink Illustration of Landscapes
Liviu Coconu, Oliver Deussen, Hans-Christian Hege.
NPAR '06: Proceedings of the 4th international symposium on Non-photorealistic animation and rendering, pp. 27--35, New York, NY, USA, ACM Press,
2006. [BibTeX]
Real-Time Watercolor for Animation
Thomas Luft, Oliver Deussen.
Journal of Computer Science and Technology, Vol. 21, No. 2, pp. 159--165, March,
2006. [BibTeX]
Real-Time Watercolor Illustrations of Plants Using a Blurred Depth Test
Author(s): Thomas Luft, Oliver Deussen.
Proceedings: NPAR '06: Proceedings of the 4th international symposium on Non-photorealistic animation and rendering, pp. 11--20, New York, NY, USA, June, ACM Press,
2006.
[BibTeX] [DOI] 
Abstract:
We present techniques to create convincing high-quality watercolor illustrations of plants. Mainly focusing on the real-time rendering, we introduce methods to abstract the visual and geometrical complexity of the original 3D plant models that are obtained from the photorealistic rendering. Additionally, we integrate detail layers to emphasize the structure, the texture, and the lighting. We distinguish between particle based, texture based, and line stroke based detail primitives, which provide a wide application range for the individual tree and plant models. To support smooth transitions and the frame-to-frame coherence during an animation, we introduce a so-called blurred depth test to perform depth comparisons. This blurred depth test is utilized for the visibility computations of the detail primitives and for the creation of a soft shadowing effect. With our techniques, we create an appropriate lighting and shadowing of the scene, and achieve a high frame-to-frame coherence. For the final watercolor appearance, we apply a formerly published approach that is implemented using hardware shaders.