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Flocking Strokes

Pauline Jepp Brian Wyvill Mario Costa Sousa. Flocking Strokes. Computational Aesthetics: Dagstuhl 2006. Introduction. Work in progress. So far: Sampling space & positioning strokes. Next steps: Better rendering of strokes. Related work. Pen-and-ink for BlobTree Implicit Models

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Flocking Strokes

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  1. Pauline Jepp Brian Wyvill Mario Costa Sousa Flocking Strokes Computational Aesthetics: Dagstuhl 2006

  2. Introduction • Work in progress. • So far: • Sampling space & positioning strokes. • Next steps: • Better rendering of strokes.

  3. Related work • Pen-and-ink for BlobTree Implicit Models • K foster, P Jepp, B Wyvill, MC Sousa & J Jorge Computer Graphics Forum 24(3) (2005), 267 - 276.

  4. Related work • Steering and flocking behaviours • C Reynolds Steering Behaviors For Autonomous Characters, Game Developers Conference 1999, 763-782. Flocks, Herds, and Schools: A Distributed Behavioral Model, SIGGRAPH 1987, 21(4), 25-34.

  5. Related work • RenderBots – Multi-Agent Systems for Direct Image Generation • S Schlechtweg et al. Computer Graphics Forum. 24(2):137-148, July 2005.

  6. Related work • High Quality Hatching. • J Zander, T Isenberg, S Schlechtweg & T Strothotte. • Eurographics 2004, Vol. 23, No. 3.

  7. Motivation • Object space • Sample & render in same pass • Style differences: • longer strokes • not too regular • hatching for implicit surfaces

  8. Steering force new velocity velocity Smarticles • Smart Particle • Particle properties: • Position • Velocity • … • Steering

  9. Containment Flow fieldfollowing Images courtesy of Craig Reynolds Smarticle & Flock Dynamics:Steering Behaviours

  10. Alignment Cohesion Separation Images courtesy of Craig Reynolds Smarticle & Flock Dynamics:Flocking Behaviours

  11. Smarticle & Flock Dynamics:Surface Constraint • Attractor force

  12. Smarticle & Flock Initialization:The Particle System • Result after system initialization • Initial positions from: • Surface particles • Chain elements

  13. Rendering the Strokes:Choosing a Stroke: terminating a stroke • Containment region • Curvature • Length of stroke • Angle from start

  14. Rendering the Strokes:Choosing a Stroke: Initial position examples

  15. Rendering the Strokes:Choosing a Stroke: Groups or Single Strokes

  16. Rendering the Strokes:Flocking Strokes • Alignment

  17. Rendering the Strokes:Flocking Strokes • Separation

  18. Rendering the Strokes:Flocking Strokes • Cohesion

  19. Rendering the Strokes:Rendering Decisions • Layering • Lighting

  20. Rendering the Strokes:Rendering Decisions • Layering • Lighting

  21. Future work • Better stroke rendering • Use normal & depth info for stroke appearance. • Correction factor to prune strokes • Even smarter smarticles/flocks • More intuitive UI

  22. Acknowledgments • Natural Sciences and Engineering Research Council of Canada (NSERC)

  23. Thank You. Questions? Comments?

  24. Related work • An illustration technique using hardware-based intersections and skeleton. • O Deussen, Joerg Hamel, A Raab, S Schlechtweg & T Strothotte.

  25. Related work • Line Art Illustrations of Parametric and Implicit Forms. • G Elber • IEEE Transactions on Visualization and Computer Graphics, Vol. 4, No. 1, 1998

  26. Related work • Spray Rendering – Visualization Using Smart Particles. • A Pang & K smith. Visualization '93, pp 283 - 290, IEEE Computer Society, 1993

  27. Related work • An Artificial Ant Approach to Non-Photorealistic Rendering. • Y Semet, U. O’Reilly, F Durand.

  28. Related work • Illustrating Smooth Surfaces. • A Hertzman & Dennis Zorin.

  29. Related work • Real-time Hatching. • E Praun, H Hoppes, M Webb & A Finklestein. • SIGGRAPH2001

  30. Overview • Motivation • Particle & Flock Initialization • Particle & Flock Dynamics • Rendering the Strokes

  31. Rendering the Strokes:Flocking Strokes • Alignment • Separation • Cohesion

  32. (sample) (strokes) (silhouette) (feature) Flock Management • Assignment & coordination of tasks • Evaluation of field details • Sampling tally • Identify: • undersampled voxels • neighbouring surface voxels

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