Prof. Dr. Jürgen Döllner


Illustrating Terrains using Direction of Slope and Lighting

Buchin, Kevin; Sousa, Mario Costa; Döllner, Jürgen; Samavati, Faramarz; Walther, Maike in 4th ICA Mountain Carthography Workshop Seite 259--269 . 2004 .

Landscape illustrations and cartographic maps depict terrain surface in a qualitatively effective way. In this paper, we present a framework for line drawing techniques for automatically reproducing traditional illustrations of terrain by means of slope lines and tonal variations. Given a digital elevation model, surface measures are computed and slope lines of the terrain are hierarchically traced and stored. At run-time slope lines are rendered by stylized procedural and texture-based strokes. The stroke density of the final image is determined according to the light intensities. Using a texture based approach, the line drawing pipeline is encapsulated from the rendering of the terrain geometry. Our system operates on terrain data at interactive rates while maintaining frame-to-frame coherence.
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Tags Terrain_visualization cgs non-photorealistic_rendering