1. Modeling

2. Modeling
Build
Scan/Digitize
Procedural

3. Build:
Creating objects, surfaces, edges, etc… from scratch.

4. Surfaces created by optical or laser scanner.

5. Points entered manually by use of a 3D digitizer.

6. Procedural: Geometry created by user defined equations.
Typically used for large “random” scenes (crowds, cityscapes, environmental systems, etc…)

7. Procedural:
“Pixel City”

8. Types of Models

9. Parametric

10. Geometry defined by parameters.
Parametric
Geometry defined by parameters.

11. Parameters can control relationships
Parametric
Parameters can control relationships

12. Surface

13. Surface Geometry defined by surfaces Fast, efficient rendering
Types: Meshes, NURBS, Polygons

14. Most common modeling in CAD programs
Surface: Mesh
Most common modeling in CAD programs

15. Surfaces defined by 3 sided geometry (Triangles)
Surface: Mesh
Surfaces defined by 3 sided geometry (Triangles)

16. Rectangles defined by 2 triangles
Surface: Mesh
Rectangles defined by 2 triangles

17. Triangles don’t bend well
Surface: Mesh
Triangles don’t bend well

18. “Smoothing” blurs edges, with limitations
Surface: Mesh
“Smoothing” blurs edges, with limitations

19. Surfaces defined by Curves
Surface: NURBS
Surfaces defined by Curves

20. Surfaces defined by Curves
Surface: NURBS
Surfaces defined by Curves

21. Curves defined by Control Points
Surface: NURBS
Curves defined by Control Points

22. Changing the curve changes the surface
Surface: NURBS
Changing the curve changes the surface

23. Surfaces defined by 4 sided geometry (Rectangles)
Surface: Polygon
Surfaces defined by 4 sided geometry (Rectangles)

24. Polygons are easily subdivided. Tools include Extrusions, Bevel, etc…
Surface: Polygon
Polygons are easily subdivided. Tools include Extrusions, Bevel, etc…

25. Polygon specific smoothing tools.
Surface: Polygon
Polygon specific smoothing tools.