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# ATEC 4371.001 Procedural Animation PowerPoint PPT Presentation

ATEC 4371.001 Procedural Animation. Introduction to Procedural Methods in 3D Computer Animation Dr. Midori Kitagawa. In class. Pay attention Take notes Learn Be ready for a pop quiz. Week 6: Modeling. Assignment 4 review – The earth’s tilt Assignment 6 review Basic modeling methods

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ATEC 4371.001 Procedural Animation

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## ATEC 4371.001Procedural Animation

Introduction to Procedural Methods in 3D Computer Animation

Dr. Midori Kitagawa

### In class

• Pay attention

• Take notes

• Learn

• Be ready for a pop quiz

### Week 6: Modeling

• Assignment 4 review – The earth’s tilt

• Assignment 6 review

• Basic modeling methods

• Assignment 12

### Basic Modeling Methods

• Lofting

• Extrusion

• Sweeping

• Surface of evolution

• Boolean operations

### Lofting

• Originated in boat design

• 2D cross-sections placed in 3D space are connected by side faces to form a 3D shape.

### 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.

### Sweeping

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

### Surface of revolution

• 2D profile is rotated around an axis to create a 3D shape.

### Boolean operations

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

A u B

A - B

B - A

A n B

### Boolean operations

• Cookie SOP in Houdini

• Can produce a complicated object with a repeated used of operations.

• Prone to computational errors.

### 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.