1. Presenter: Chujia Wei School of Computer Science Carleton University Supervisor: David Mould Coordinated Particle Tracing

2. Introduction 2 Stylized images Images created by scratchboard.

3. Technique – Particle system 3 Attributes such as Position Speed Direction Dynamics Move according to speed and direction Update attributes over time

4. 4 Conventional particle system Technique – Particle tracing Created by l. karluk Created using “Flame Painter”

5. 5 Parallel curves Coordinated movement Figures are created by scratchboard. Technique – Coordinated particle tracing

6. 6 “Parallel Curves”by Sol LeWitt.

7. 7 Additional attribute Neighbor ID (for coordination) Additional dynamics Coordinate with neighbors Technique – Coordinated particle tracing

8. Related work 8 “RenderBots—Multi Agent Systems for Direct Image Generation”, S. Schlechtweg, T. Germer and T. Strothotte, 2005. “Artistic Tessellations by Growing Curves”, H. Li and D. Mould, 2011.

9. 1. RenderBots—Multi Agent Systems for Direct Image Generation 9 EdgeBots.

10. 10 HatchingBots.

11. 2. Artistic Tessellations by Growing Curves 11 Figure: created by Li and Mould.

12. Other applications 12 Creating natural images/textures.

13. Other applications 13 Example of creating mushroom gills.

14. Algorithm 14 Basic rules Coordinated moving system A B C D

15. Algorithm 15 Birth and death Birth: generate new particles from an existing one. Death: merge one particle with its neighbor.

16. Using input images (plan) 16 Match tones Particle spacing based on intensity Created by photoshop

17. 17 Emit particles at proper position Emit at edges/ stipple points Right figure: created by Mould

18. 18 Shape objects Gradient based direction Right figure: created by Li and Mould

19. References 19 [1] H. Li and D. Mould, “Artistic Tessellations by Growing Curves”, Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Non- Photorealistic Animation and Rendering, page 125-134, 2011. [2] S. Schlechtweg, T. Germer and T. Strothotte, “RenderBots—Multi Agent Systems for Direct Image Generation”, Computer Graphics Forum, 2005.

20. Thank you! Questions? 20