VI. Surfaces & Deformations

II. Surfaces

A. Types of Surfaces

• Surface patches defined by points, lines, arbitrary curves
• Surfaces from 2D Controlled Curves (B-splines, NURBS = Non-Uniform Rational B-Splines, etc.)
• Arrays of surfaces = Meshes, manipulate with control points

B. FormZ Data types

• Solid Objects = solids with completely enclosed volumes
• Surface Solids = 2-sided surfaces with no volume
• Surface Objects = lines or 1-sided surfaces
• Meshes = groups of Surface Objects
  front with surface normal, back doesn't render

C. Pros & Cons of Surfaces

• Advantages: Model compact, reliable translation
• Disadvantages: no boolean operations, orientation matters for rendering

III. Meshes

A. Mesh & Smooth Mesh

B. Controlled Curves & Meshes

C. Trimming & Stitching Meshes

IV. Skinning

• A. Skinning along paths
• B. Cross-skinning
  
  Closed & Open Sources
  
  Half sources
  
  Options: add points as needed, large tolerance

Placing shapes along lines

V. Design variations with Deformations (Tut 13)

VI. Abstraction and Top-down process

• Ledoux's plan process
  
• Jahn's State of Illinois Building model

VI. Assignment 6

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