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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

ATEC 4371.001Procedural Animation

Introduction to Procedural Methods in 3D Computer Animation

Dr. Midori Kitagawa


In class
In class

  • Pay attention

  • Take notes

  • Learn

  • Be ready for a pop quiz


Week 6 modeling
Week 6: Modeling

  • Assignment 4 review – The earth’s tilt

  • Assignment 6 review

  • Basic modeling methods

  • Assignment 12


Basic modeling methods
Basic Modeling Methods

  • Lofting

  • Extrusion

  • Sweeping

  • Surface of evolution

  • Boolean operations


Lofting
Lofting

  • Originated in boat design

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


Extrusion
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
Sweeping

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


Surface of revolution
Surface of revolution

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


Boolean operations
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 operations1
Boolean operations

  • Cookie SOP in Houdini

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

  • Prone to computational errors.


Assignment 12
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.


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