1. Procedural Modelling of Plant Scenes Presented by: Kim R 2 Supervisors:Shaun Bangay Adele Lobb A research project for Computer Science Honours 2004

2. Project Aims Model a forest scene –Procedural modelling –L-Systems

3. Forest Scenes - Issues Many different tree species present

4. Forest Scenes - Issues Variation within each species

5. Forest Scenes - Issues Interaction: Symbiosis

6. Interaction: Competition Forest Scenes - Issues

7. Varying detail level depending on distance from viewer

8. Solution L-Systems Procedural Modelling

9. L-Systems Formal set of rules and symbols Originally described cellular growth Rules applied iteratively to start sequence Graphics: symbols describe drawing paths or end graphics (such as a leaf)

10. Simple L-System Example F [ & + F] F[ - > F] [- > F] [& F]

11. Stochastic L-Systems Several rules for each symbol Rules chosen based on probability Create different plants using same L-System Simulate environmental effects

12. Stochastic L-System Example

13. Procedural Modelling Use procedure to generate all needed geometric primitives Store complex tasks in procedure –Detail level –Shaders –Internal animation

14. This Project Create a procedural modelling language –Similar in syntax to Renderman shading language or MEL Include: –Tree species/type –Conditions (for L-System) –Detail level (distance from viewer)

15. Questions?