1. 3D Data Generation for CG
Introduction to Computer Graphics
CSE 470/598
Arizona State University
Dianne Hansford

2. Primary CG Applications
Engineering
CAD/CAM
Animation
advertising & feature films
Games
Visualization
What are the 3d data needs of each application?

3. Engineering Precision of design Analysis methods Manufacturable
CAD/CAM := computer-aided design & manufacture
Precision of design
Analysis methods
Manufacturable
Hierarchical
From

4. Animation: feature films
Cartoon .vs. realism
Optimize rendering time
Easily animated
Highly textured
Finding Nemo from Pixar

5. Animation: advertising
Similar to films
CAD design often available
Listerine animated ad from Pixar

6. Games Low polygon count Highly textured Cartoon .vs. realism
Easily animated
Need for Speed from Electronic Arts

7. Visualization Representation and interpretation of measured data
Devote class to this later in semester
Earth winds from LLNL

8. Creating 3D Data 1. Modeling system CAD/CAM Entertainment
2. Digitize an object
Tool sets differentiate packages

9. CAD Modeling System Many times: 2D plans basis of 3D models
Parametric curves and surfaces: Bézier, NURBS
Engineer’s toolset

10. Entertainment Modeling System
Combines many data creation techniques
polygons
NURBS
subdivision surfaces
Artist’s toolset
Animation tools
3ds max
Maya

11. Digitizing Scanners: non-tactile (laser) tactile
Part of process called reverse engineering

12. Reverse Engineering Process
Scan
Registration of data
Triangulate
Clean-up data
Decimate
Modeling system
 archival data

14. becoming an artist’s tool
Reverse Engineering
becoming an artist’s tool
ASU Partnership for Research in Spatial Modeling
Art Dept. -- Dan Collins

15. Pixar Case Study: Characters
Character development: reverse engineering clay model  digitize  modeling system
From Geri’s game

16. Tactile digitizing: Labor intensive but Can make transition
to modeling system
easier

17. Pixar Case Study: Modeling
In-house modeling tools
’95 Toy Story parametric surfaces
’97 Geri’s Game subdivision surfaces
’98 A Bug’s Life subdivision surfaces
...
Found animation tools difficult to create
Experimented with subdivision surfaces on this short film
Major hurdle: textures
Parametric surfaces still used at Pacific Data (Antz, Shrek)

18. 3D Models Models sold & free www.turbosquid.com www.3dcafe.com
Many file formats available
Just about any object