1. Procedural Animation
Introduction to Procedural Methods in 3D Computer Animation
Dr. Midori Kitagawa

2. In class
Pay attention
Take notes
Learn
Be ready for a pop quiz

3. Week 6: Modeling
Basic modeling methods
Assignment 12

4. Basic Modeling Methods
Lofting
Extrusion
Sweeping
Surface of evolution
Boolean operations

5. Lofting Originated in boat design
2D cross-sections placed in 3D space are connected by side faces to form a 3D shape.

6. Extrusion Also called projection
A copy of a 2D profile is made and translated and then the original and copied profiles are connected by side faces to form a 3D shape.

7. Sweeping
2D cross-section is swept along a 3D path to create a 3D shape.

8. Surface of revolution
2D profile is rotated around an axis to create a 3D shape.

9. Boolean operations
Boolean operation -- union (or, “u”), intersection (and, “n”), or difference (not, “-”) -- is applied to a pair of objects.
A u B
A n B
A - B
B - A

10. Boolean operations Cookie SOP in Houdini
Can produce a complicated object with a repeated used of operations.
Prone to computational errors.

11. Assignment 12
Create 3D models of four or more different kinds of sea shells.
At least two univalves and at least two bivalves.
Color each model with at least two colors using Group SOPs.
Make them as realistic as you can.