1. ATEC 4371.001 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 three different kinds of sea shells.
At least one should be a univalve (a single coiled shell), the other(s) a bivalve.
Color each model with at least two colors using Group SOPs.
Make them as realistic as you can.