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  Assignment 4 review – The earth’s tilt  Assignment 6 review  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 B - AA - B

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.